3313 lines
99 KiB
C
3313 lines
99 KiB
C
/*-------------------------------------------------------------------------
|
||
*
|
||
* heap.c
|
||
* code to create and destroy POSTGRES heap relations
|
||
*
|
||
* Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
|
||
* Portions Copyright (c) 1994, Regents of the University of California
|
||
*
|
||
*
|
||
* IDENTIFICATION
|
||
* src/backend/catalog/heap.c
|
||
*
|
||
*
|
||
* INTERFACE ROUTINES
|
||
* heap_create() - Create an uncataloged heap relation
|
||
* heap_create_with_catalog() - Create a cataloged relation
|
||
* heap_drop_with_catalog() - Removes named relation from catalogs
|
||
*
|
||
* NOTES
|
||
* this code taken from access/heap/create.c, which contains
|
||
* the old heap_create_with_catalog, amcreate, and amdestroy.
|
||
* those routines will soon call these routines using the function
|
||
* manager,
|
||
* just like the poorly named "NewXXX" routines do. The
|
||
* "New" routines are all going to die soon, once and for all!
|
||
* -cim 1/13/91
|
||
*
|
||
*-------------------------------------------------------------------------
|
||
*/
|
||
#include "postgres.h"
|
||
|
||
#include "access/htup_details.h"
|
||
#include "access/multixact.h"
|
||
#include "access/sysattr.h"
|
||
#include "access/transam.h"
|
||
#include "access/xact.h"
|
||
#include "access/xlog.h"
|
||
#include "catalog/binary_upgrade.h"
|
||
#include "catalog/catalog.h"
|
||
#include "catalog/dependency.h"
|
||
#include "catalog/heap.h"
|
||
#include "catalog/index.h"
|
||
#include "catalog/objectaccess.h"
|
||
#include "catalog/partition.h"
|
||
#include "catalog/pg_attrdef.h"
|
||
#include "catalog/pg_collation.h"
|
||
#include "catalog/pg_constraint.h"
|
||
#include "catalog/pg_constraint_fn.h"
|
||
#include "catalog/pg_foreign_table.h"
|
||
#include "catalog/pg_inherits.h"
|
||
#include "catalog/pg_namespace.h"
|
||
#include "catalog/pg_opclass.h"
|
||
#include "catalog/pg_partitioned_table.h"
|
||
#include "catalog/pg_statistic.h"
|
||
#include "catalog/pg_subscription_rel.h"
|
||
#include "catalog/pg_tablespace.h"
|
||
#include "catalog/pg_type.h"
|
||
#include "catalog/pg_type_fn.h"
|
||
#include "catalog/storage.h"
|
||
#include "catalog/storage_xlog.h"
|
||
#include "commands/tablecmds.h"
|
||
#include "commands/typecmds.h"
|
||
#include "miscadmin.h"
|
||
#include "nodes/nodeFuncs.h"
|
||
#include "optimizer/var.h"
|
||
#include "parser/parse_coerce.h"
|
||
#include "parser/parse_collate.h"
|
||
#include "parser/parse_expr.h"
|
||
#include "parser/parse_relation.h"
|
||
#include "storage/lmgr.h"
|
||
#include "storage/predicate.h"
|
||
#include "storage/smgr.h"
|
||
#include "utils/acl.h"
|
||
#include "utils/builtins.h"
|
||
#include "utils/fmgroids.h"
|
||
#include "utils/inval.h"
|
||
#include "utils/lsyscache.h"
|
||
#include "utils/rel.h"
|
||
#include "utils/ruleutils.h"
|
||
#include "utils/snapmgr.h"
|
||
#include "utils/syscache.h"
|
||
#include "utils/tqual.h"
|
||
|
||
|
||
/* Potentially set by pg_upgrade_support functions */
|
||
Oid binary_upgrade_next_heap_pg_class_oid = InvalidOid;
|
||
Oid binary_upgrade_next_toast_pg_class_oid = InvalidOid;
|
||
|
||
static void AddNewRelationTuple(Relation pg_class_desc,
|
||
Relation new_rel_desc,
|
||
Oid new_rel_oid,
|
||
Oid new_type_oid,
|
||
Oid reloftype,
|
||
Oid relowner,
|
||
char relkind,
|
||
Datum relacl,
|
||
Datum reloptions);
|
||
static ObjectAddress AddNewRelationType(const char *typeName,
|
||
Oid typeNamespace,
|
||
Oid new_rel_oid,
|
||
char new_rel_kind,
|
||
Oid ownerid,
|
||
Oid new_row_type,
|
||
Oid new_array_type);
|
||
static void RelationRemoveInheritance(Oid relid);
|
||
static Oid StoreRelCheck(Relation rel, const char *ccname, Node *expr,
|
||
bool is_validated, bool is_local, int inhcount,
|
||
bool is_no_inherit, bool is_internal);
|
||
static void StoreConstraints(Relation rel, List *cooked_constraints,
|
||
bool is_internal);
|
||
static bool MergeWithExistingConstraint(Relation rel, const char *ccname, Node *expr,
|
||
bool allow_merge, bool is_local,
|
||
bool is_initially_valid,
|
||
bool is_no_inherit);
|
||
static void SetRelationNumChecks(Relation rel, int numchecks);
|
||
static Node *cookConstraint(ParseState *pstate,
|
||
Node *raw_constraint,
|
||
char *relname);
|
||
static List *insert_ordered_unique_oid(List *list, Oid datum);
|
||
|
||
|
||
/* ----------------------------------------------------------------
|
||
* XXX UGLY HARD CODED BADNESS FOLLOWS XXX
|
||
*
|
||
* these should all be moved to someplace in the lib/catalog
|
||
* module, if not obliterated first.
|
||
* ----------------------------------------------------------------
|
||
*/
|
||
|
||
|
||
/*
|
||
* Note:
|
||
* Should the system special case these attributes in the future?
|
||
* Advantage: consume much less space in the ATTRIBUTE relation.
|
||
* Disadvantage: special cases will be all over the place.
|
||
*/
|
||
|
||
/*
|
||
* The initializers below do not include trailing variable length fields,
|
||
* but that's OK - we're never going to reference anything beyond the
|
||
* fixed-size portion of the structure anyway.
|
||
*/
|
||
|
||
static FormData_pg_attribute a1 = {
|
||
0, {"ctid"}, TIDOID, 0, sizeof(ItemPointerData),
|
||
SelfItemPointerAttributeNumber, 0, -1, -1,
|
||
false, 'p', 's', true, false, '\0', false, true, 0
|
||
};
|
||
|
||
static FormData_pg_attribute a2 = {
|
||
0, {"oid"}, OIDOID, 0, sizeof(Oid),
|
||
ObjectIdAttributeNumber, 0, -1, -1,
|
||
true, 'p', 'i', true, false, '\0', false, true, 0
|
||
};
|
||
|
||
static FormData_pg_attribute a3 = {
|
||
0, {"xmin"}, XIDOID, 0, sizeof(TransactionId),
|
||
MinTransactionIdAttributeNumber, 0, -1, -1,
|
||
true, 'p', 'i', true, false, '\0', false, true, 0
|
||
};
|
||
|
||
static FormData_pg_attribute a4 = {
|
||
0, {"cmin"}, CIDOID, 0, sizeof(CommandId),
|
||
MinCommandIdAttributeNumber, 0, -1, -1,
|
||
true, 'p', 'i', true, false, '\0', false, true, 0
|
||
};
|
||
|
||
static FormData_pg_attribute a5 = {
|
||
0, {"xmax"}, XIDOID, 0, sizeof(TransactionId),
|
||
MaxTransactionIdAttributeNumber, 0, -1, -1,
|
||
true, 'p', 'i', true, false, '\0', false, true, 0
|
||
};
|
||
|
||
static FormData_pg_attribute a6 = {
|
||
0, {"cmax"}, CIDOID, 0, sizeof(CommandId),
|
||
MaxCommandIdAttributeNumber, 0, -1, -1,
|
||
true, 'p', 'i', true, false, '\0', false, true, 0
|
||
};
|
||
|
||
/*
|
||
* We decided to call this attribute "tableoid" rather than say
|
||
* "classoid" on the basis that in the future there may be more than one
|
||
* table of a particular class/type. In any case table is still the word
|
||
* used in SQL.
|
||
*/
|
||
static FormData_pg_attribute a7 = {
|
||
0, {"tableoid"}, OIDOID, 0, sizeof(Oid),
|
||
TableOidAttributeNumber, 0, -1, -1,
|
||
true, 'p', 'i', true, false, '\0', false, true, 0
|
||
};
|
||
|
||
static const Form_pg_attribute SysAtt[] = {&a1, &a2, &a3, &a4, &a5, &a6, &a7};
|
||
|
||
/*
|
||
* This function returns a Form_pg_attribute pointer for a system attribute.
|
||
* Note that we elog if the presented attno is invalid, which would only
|
||
* happen if there's a problem upstream.
|
||
*/
|
||
Form_pg_attribute
|
||
SystemAttributeDefinition(AttrNumber attno, bool relhasoids)
|
||
{
|
||
if (attno >= 0 || attno < -(int) lengthof(SysAtt))
|
||
elog(ERROR, "invalid system attribute number %d", attno);
|
||
if (attno == ObjectIdAttributeNumber && !relhasoids)
|
||
elog(ERROR, "invalid system attribute number %d", attno);
|
||
return SysAtt[-attno - 1];
|
||
}
|
||
|
||
/*
|
||
* If the given name is a system attribute name, return a Form_pg_attribute
|
||
* pointer for a prototype definition. If not, return NULL.
|
||
*/
|
||
Form_pg_attribute
|
||
SystemAttributeByName(const char *attname, bool relhasoids)
|
||
{
|
||
int j;
|
||
|
||
for (j = 0; j < (int) lengthof(SysAtt); j++)
|
||
{
|
||
Form_pg_attribute att = SysAtt[j];
|
||
|
||
if (relhasoids || att->attnum != ObjectIdAttributeNumber)
|
||
{
|
||
if (strcmp(NameStr(att->attname), attname) == 0)
|
||
return att;
|
||
}
|
||
}
|
||
|
||
return NULL;
|
||
}
|
||
|
||
|
||
/* ----------------------------------------------------------------
|
||
* XXX END OF UGLY HARD CODED BADNESS XXX
|
||
* ---------------------------------------------------------------- */
|
||
|
||
|
||
/* ----------------------------------------------------------------
|
||
* heap_create - Create an uncataloged heap relation
|
||
*
|
||
* Note API change: the caller must now always provide the OID
|
||
* to use for the relation. The relfilenode may (and, normally,
|
||
* should) be left unspecified.
|
||
*
|
||
* rel->rd_rel is initialized by RelationBuildLocalRelation,
|
||
* and is mostly zeroes at return.
|
||
* ----------------------------------------------------------------
|
||
*/
|
||
Relation
|
||
heap_create(const char *relname,
|
||
Oid relnamespace,
|
||
Oid reltablespace,
|
||
Oid relid,
|
||
Oid relfilenode,
|
||
TupleDesc tupDesc,
|
||
char relkind,
|
||
char relpersistence,
|
||
bool shared_relation,
|
||
bool mapped_relation,
|
||
bool allow_system_table_mods)
|
||
{
|
||
bool create_storage;
|
||
Relation rel;
|
||
|
||
/* The caller must have provided an OID for the relation. */
|
||
Assert(OidIsValid(relid));
|
||
|
||
/*
|
||
* Don't allow creating relations in pg_catalog directly, even though it
|
||
* is allowed to move user defined relations there. Semantics with search
|
||
* paths including pg_catalog are too confusing for now.
|
||
*
|
||
* But allow creating indexes on relations in pg_catalog even if
|
||
* allow_system_table_mods = off, upper layers already guarantee it's on a
|
||
* user defined relation, not a system one.
|
||
*/
|
||
if (!allow_system_table_mods &&
|
||
((IsSystemNamespace(relnamespace) && relkind != RELKIND_INDEX) ||
|
||
IsToastNamespace(relnamespace)) &&
|
||
IsNormalProcessingMode())
|
||
ereport(ERROR,
|
||
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
|
||
errmsg("permission denied to create \"%s.%s\"",
|
||
get_namespace_name(relnamespace), relname),
|
||
errdetail("System catalog modifications are currently disallowed.")));
|
||
|
||
/*
|
||
* Decide if we need storage or not, and handle a couple other special
|
||
* cases for particular relkinds.
|
||
*/
|
||
switch (relkind)
|
||
{
|
||
case RELKIND_VIEW:
|
||
case RELKIND_COMPOSITE_TYPE:
|
||
case RELKIND_FOREIGN_TABLE:
|
||
case RELKIND_PARTITIONED_TABLE:
|
||
case RELKIND_PARTITIONED_INDEX:
|
||
create_storage = false;
|
||
|
||
/*
|
||
* Force reltablespace to zero if the relation has no physical
|
||
* storage. This is mainly just for cleanliness' sake.
|
||
*/
|
||
reltablespace = InvalidOid;
|
||
break;
|
||
case RELKIND_SEQUENCE:
|
||
create_storage = true;
|
||
|
||
/*
|
||
* Force reltablespace to zero for sequences, since we don't
|
||
* support moving them around into different tablespaces.
|
||
*/
|
||
reltablespace = InvalidOid;
|
||
break;
|
||
default:
|
||
create_storage = true;
|
||
break;
|
||
}
|
||
|
||
/*
|
||
* Unless otherwise requested, the physical ID (relfilenode) is initially
|
||
* the same as the logical ID (OID). When the caller did specify a
|
||
* relfilenode, it already exists; do not attempt to create it.
|
||
*/
|
||
if (OidIsValid(relfilenode))
|
||
create_storage = false;
|
||
else
|
||
relfilenode = relid;
|
||
|
||
/*
|
||
* Never allow a pg_class entry to explicitly specify the database's
|
||
* default tablespace in reltablespace; force it to zero instead. This
|
||
* ensures that if the database is cloned with a different default
|
||
* tablespace, the pg_class entry will still match where CREATE DATABASE
|
||
* will put the physically copied relation.
|
||
*
|
||
* Yes, this is a bit of a hack.
|
||
*/
|
||
if (reltablespace == MyDatabaseTableSpace)
|
||
reltablespace = InvalidOid;
|
||
|
||
/*
|
||
* build the relcache entry.
|
||
*/
|
||
rel = RelationBuildLocalRelation(relname,
|
||
relnamespace,
|
||
tupDesc,
|
||
relid,
|
||
relfilenode,
|
||
reltablespace,
|
||
shared_relation,
|
||
mapped_relation,
|
||
relpersistence,
|
||
relkind);
|
||
|
||
/*
|
||
* Have the storage manager create the relation's disk file, if needed.
|
||
*
|
||
* We only create the main fork here, other forks will be created on
|
||
* demand.
|
||
*/
|
||
if (create_storage)
|
||
{
|
||
RelationOpenSmgr(rel);
|
||
RelationCreateStorage(rel->rd_node, relpersistence);
|
||
}
|
||
|
||
return rel;
|
||
}
|
||
|
||
/* ----------------------------------------------------------------
|
||
* heap_create_with_catalog - Create a cataloged relation
|
||
*
|
||
* this is done in multiple steps:
|
||
*
|
||
* 1) CheckAttributeNamesTypes() is used to make certain the tuple
|
||
* descriptor contains a valid set of attribute names and types
|
||
*
|
||
* 2) pg_class is opened and get_relname_relid()
|
||
* performs a scan to ensure that no relation with the
|
||
* same name already exists.
|
||
*
|
||
* 3) heap_create() is called to create the new relation on disk.
|
||
*
|
||
* 4) TypeCreate() is called to define a new type corresponding
|
||
* to the new relation.
|
||
*
|
||
* 5) AddNewRelationTuple() is called to register the
|
||
* relation in pg_class.
|
||
*
|
||
* 6) AddNewAttributeTuples() is called to register the
|
||
* new relation's schema in pg_attribute.
|
||
*
|
||
* 7) StoreConstraints is called () - vadim 08/22/97
|
||
*
|
||
* 8) the relations are closed and the new relation's oid
|
||
* is returned.
|
||
*
|
||
* ----------------------------------------------------------------
|
||
*/
|
||
|
||
/* --------------------------------
|
||
* CheckAttributeNamesTypes
|
||
*
|
||
* this is used to make certain the tuple descriptor contains a
|
||
* valid set of attribute names and datatypes. a problem simply
|
||
* generates ereport(ERROR) which aborts the current transaction.
|
||
* --------------------------------
|
||
*/
|
||
void
|
||
CheckAttributeNamesTypes(TupleDesc tupdesc, char relkind,
|
||
bool allow_system_table_mods)
|
||
{
|
||
int i;
|
||
int j;
|
||
int natts = tupdesc->natts;
|
||
|
||
/* Sanity check on column count */
|
||
if (natts < 0 || natts > MaxHeapAttributeNumber)
|
||
ereport(ERROR,
|
||
(errcode(ERRCODE_TOO_MANY_COLUMNS),
|
||
errmsg("tables can have at most %d columns",
|
||
MaxHeapAttributeNumber)));
|
||
|
||
/*
|
||
* first check for collision with system attribute names
|
||
*
|
||
* Skip this for a view or type relation, since those don't have system
|
||
* attributes.
|
||
*/
|
||
if (relkind != RELKIND_VIEW && relkind != RELKIND_COMPOSITE_TYPE)
|
||
{
|
||
for (i = 0; i < natts; i++)
|
||
{
|
||
Form_pg_attribute attr = TupleDescAttr(tupdesc, i);
|
||
|
||
if (SystemAttributeByName(NameStr(attr->attname),
|
||
tupdesc->tdhasoid) != NULL)
|
||
ereport(ERROR,
|
||
(errcode(ERRCODE_DUPLICATE_COLUMN),
|
||
errmsg("column name \"%s\" conflicts with a system column name",
|
||
NameStr(attr->attname))));
|
||
}
|
||
}
|
||
|
||
/*
|
||
* next check for repeated attribute names
|
||
*/
|
||
for (i = 1; i < natts; i++)
|
||
{
|
||
for (j = 0; j < i; j++)
|
||
{
|
||
if (strcmp(NameStr(TupleDescAttr(tupdesc, j)->attname),
|
||
NameStr(TupleDescAttr(tupdesc, i)->attname)) == 0)
|
||
ereport(ERROR,
|
||
(errcode(ERRCODE_DUPLICATE_COLUMN),
|
||
errmsg("column name \"%s\" specified more than once",
|
||
NameStr(TupleDescAttr(tupdesc, j)->attname))));
|
||
}
|
||
}
|
||
|
||
/*
|
||
* next check the attribute types
|
||
*/
|
||
for (i = 0; i < natts; i++)
|
||
{
|
||
CheckAttributeType(NameStr(TupleDescAttr(tupdesc, i)->attname),
|
||
TupleDescAttr(tupdesc, i)->atttypid,
|
||
TupleDescAttr(tupdesc, i)->attcollation,
|
||
NIL, /* assume we're creating a new rowtype */
|
||
allow_system_table_mods);
|
||
}
|
||
}
|
||
|
||
/* --------------------------------
|
||
* CheckAttributeType
|
||
*
|
||
* Verify that the proposed datatype of an attribute is legal.
|
||
* This is needed mainly because there are types (and pseudo-types)
|
||
* in the catalogs that we do not support as elements of real tuples.
|
||
* We also check some other properties required of a table column.
|
||
*
|
||
* If the attribute is being proposed for addition to an existing table or
|
||
* composite type, pass a one-element list of the rowtype OID as
|
||
* containing_rowtypes. When checking a to-be-created rowtype, it's
|
||
* sufficient to pass NIL, because there could not be any recursive reference
|
||
* to a not-yet-existing rowtype.
|
||
* --------------------------------
|
||
*/
|
||
void
|
||
CheckAttributeType(const char *attname,
|
||
Oid atttypid, Oid attcollation,
|
||
List *containing_rowtypes,
|
||
bool allow_system_table_mods)
|
||
{
|
||
char att_typtype = get_typtype(atttypid);
|
||
Oid att_typelem;
|
||
|
||
if (att_typtype == TYPTYPE_PSEUDO)
|
||
{
|
||
/*
|
||
* Refuse any attempt to create a pseudo-type column, except for a
|
||
* special hack for pg_statistic: allow ANYARRAY when modifying system
|
||
* catalogs (this allows creating pg_statistic and cloning it during
|
||
* VACUUM FULL)
|
||
*/
|
||
if (atttypid != ANYARRAYOID || !allow_system_table_mods)
|
||
ereport(ERROR,
|
||
(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
|
||
errmsg("column \"%s\" has pseudo-type %s",
|
||
attname, format_type_be(atttypid))));
|
||
}
|
||
else if (att_typtype == TYPTYPE_DOMAIN)
|
||
{
|
||
/*
|
||
* If it's a domain, recurse to check its base type.
|
||
*/
|
||
CheckAttributeType(attname, getBaseType(atttypid), attcollation,
|
||
containing_rowtypes,
|
||
allow_system_table_mods);
|
||
}
|
||
else if (att_typtype == TYPTYPE_COMPOSITE)
|
||
{
|
||
/*
|
||
* For a composite type, recurse into its attributes.
|
||
*/
|
||
Relation relation;
|
||
TupleDesc tupdesc;
|
||
int i;
|
||
|
||
/*
|
||
* Check for self-containment. Eventually we might be able to allow
|
||
* this (just return without complaint, if so) but it's not clear how
|
||
* many other places would require anti-recursion defenses before it
|
||
* would be safe to allow tables to contain their own rowtype.
|
||
*/
|
||
if (list_member_oid(containing_rowtypes, atttypid))
|
||
ereport(ERROR,
|
||
(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
|
||
errmsg("composite type %s cannot be made a member of itself",
|
||
format_type_be(atttypid))));
|
||
|
||
containing_rowtypes = lcons_oid(atttypid, containing_rowtypes);
|
||
|
||
relation = relation_open(get_typ_typrelid(atttypid), AccessShareLock);
|
||
|
||
tupdesc = RelationGetDescr(relation);
|
||
|
||
for (i = 0; i < tupdesc->natts; i++)
|
||
{
|
||
Form_pg_attribute attr = TupleDescAttr(tupdesc, i);
|
||
|
||
if (attr->attisdropped)
|
||
continue;
|
||
CheckAttributeType(NameStr(attr->attname),
|
||
attr->atttypid, attr->attcollation,
|
||
containing_rowtypes,
|
||
allow_system_table_mods);
|
||
}
|
||
|
||
relation_close(relation, AccessShareLock);
|
||
|
||
containing_rowtypes = list_delete_first(containing_rowtypes);
|
||
}
|
||
else if (OidIsValid((att_typelem = get_element_type(atttypid))))
|
||
{
|
||
/*
|
||
* Must recurse into array types, too, in case they are composite.
|
||
*/
|
||
CheckAttributeType(attname, att_typelem, attcollation,
|
||
containing_rowtypes,
|
||
allow_system_table_mods);
|
||
}
|
||
|
||
/*
|
||
* This might not be strictly invalid per SQL standard, but it is pretty
|
||
* useless, and it cannot be dumped, so we must disallow it.
|
||
*/
|
||
if (!OidIsValid(attcollation) && type_is_collatable(atttypid))
|
||
ereport(ERROR,
|
||
(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
|
||
errmsg("no collation was derived for column \"%s\" with collatable type %s",
|
||
attname, format_type_be(atttypid)),
|
||
errhint("Use the COLLATE clause to set the collation explicitly.")));
|
||
}
|
||
|
||
/*
|
||
* InsertPgAttributeTuple
|
||
* Construct and insert a new tuple in pg_attribute.
|
||
*
|
||
* Caller has already opened and locked pg_attribute. new_attribute is the
|
||
* attribute to insert (but we ignore attacl and attoptions, which are always
|
||
* initialized to NULL).
|
||
*
|
||
* indstate is the index state for CatalogTupleInsertWithInfo. It can be
|
||
* passed as NULL, in which case we'll fetch the necessary info. (Don't do
|
||
* this when inserting multiple attributes, because it's a tad more
|
||
* expensive.)
|
||
*/
|
||
void
|
||
InsertPgAttributeTuple(Relation pg_attribute_rel,
|
||
Form_pg_attribute new_attribute,
|
||
CatalogIndexState indstate)
|
||
{
|
||
Datum values[Natts_pg_attribute];
|
||
bool nulls[Natts_pg_attribute];
|
||
HeapTuple tup;
|
||
|
||
/* This is a tad tedious, but way cleaner than what we used to do... */
|
||
memset(values, 0, sizeof(values));
|
||
memset(nulls, false, sizeof(nulls));
|
||
|
||
values[Anum_pg_attribute_attrelid - 1] = ObjectIdGetDatum(new_attribute->attrelid);
|
||
values[Anum_pg_attribute_attname - 1] = NameGetDatum(&new_attribute->attname);
|
||
values[Anum_pg_attribute_atttypid - 1] = ObjectIdGetDatum(new_attribute->atttypid);
|
||
values[Anum_pg_attribute_attstattarget - 1] = Int32GetDatum(new_attribute->attstattarget);
|
||
values[Anum_pg_attribute_attlen - 1] = Int16GetDatum(new_attribute->attlen);
|
||
values[Anum_pg_attribute_attnum - 1] = Int16GetDatum(new_attribute->attnum);
|
||
values[Anum_pg_attribute_attndims - 1] = Int32GetDatum(new_attribute->attndims);
|
||
values[Anum_pg_attribute_attcacheoff - 1] = Int32GetDatum(new_attribute->attcacheoff);
|
||
values[Anum_pg_attribute_atttypmod - 1] = Int32GetDatum(new_attribute->atttypmod);
|
||
values[Anum_pg_attribute_attbyval - 1] = BoolGetDatum(new_attribute->attbyval);
|
||
values[Anum_pg_attribute_attstorage - 1] = CharGetDatum(new_attribute->attstorage);
|
||
values[Anum_pg_attribute_attalign - 1] = CharGetDatum(new_attribute->attalign);
|
||
values[Anum_pg_attribute_attnotnull - 1] = BoolGetDatum(new_attribute->attnotnull);
|
||
values[Anum_pg_attribute_atthasdef - 1] = BoolGetDatum(new_attribute->atthasdef);
|
||
values[Anum_pg_attribute_attidentity - 1] = CharGetDatum(new_attribute->attidentity);
|
||
values[Anum_pg_attribute_attisdropped - 1] = BoolGetDatum(new_attribute->attisdropped);
|
||
values[Anum_pg_attribute_attislocal - 1] = BoolGetDatum(new_attribute->attislocal);
|
||
values[Anum_pg_attribute_attinhcount - 1] = Int32GetDatum(new_attribute->attinhcount);
|
||
values[Anum_pg_attribute_attcollation - 1] = ObjectIdGetDatum(new_attribute->attcollation);
|
||
|
||
/* start out with empty permissions and empty options */
|
||
nulls[Anum_pg_attribute_attacl - 1] = true;
|
||
nulls[Anum_pg_attribute_attoptions - 1] = true;
|
||
nulls[Anum_pg_attribute_attfdwoptions - 1] = true;
|
||
|
||
tup = heap_form_tuple(RelationGetDescr(pg_attribute_rel), values, nulls);
|
||
|
||
/* finally insert the new tuple, update the indexes, and clean up */
|
||
if (indstate != NULL)
|
||
CatalogTupleInsertWithInfo(pg_attribute_rel, tup, indstate);
|
||
else
|
||
CatalogTupleInsert(pg_attribute_rel, tup);
|
||
|
||
heap_freetuple(tup);
|
||
}
|
||
|
||
/* --------------------------------
|
||
* AddNewAttributeTuples
|
||
*
|
||
* this registers the new relation's schema by adding
|
||
* tuples to pg_attribute.
|
||
* --------------------------------
|
||
*/
|
||
static void
|
||
AddNewAttributeTuples(Oid new_rel_oid,
|
||
TupleDesc tupdesc,
|
||
char relkind,
|
||
bool oidislocal,
|
||
int oidinhcount)
|
||
{
|
||
Form_pg_attribute attr;
|
||
int i;
|
||
Relation rel;
|
||
CatalogIndexState indstate;
|
||
int natts = tupdesc->natts;
|
||
ObjectAddress myself,
|
||
referenced;
|
||
|
||
/*
|
||
* open pg_attribute and its indexes.
|
||
*/
|
||
rel = heap_open(AttributeRelationId, RowExclusiveLock);
|
||
|
||
indstate = CatalogOpenIndexes(rel);
|
||
|
||
/*
|
||
* First we add the user attributes. This is also a convenient place to
|
||
* add dependencies on their datatypes and collations.
|
||
*/
|
||
for (i = 0; i < natts; i++)
|
||
{
|
||
attr = TupleDescAttr(tupdesc, i);
|
||
/* Fill in the correct relation OID */
|
||
attr->attrelid = new_rel_oid;
|
||
/* Make sure these are OK, too */
|
||
attr->attstattarget = -1;
|
||
attr->attcacheoff = -1;
|
||
|
||
InsertPgAttributeTuple(rel, attr, indstate);
|
||
|
||
/* Add dependency info */
|
||
myself.classId = RelationRelationId;
|
||
myself.objectId = new_rel_oid;
|
||
myself.objectSubId = i + 1;
|
||
referenced.classId = TypeRelationId;
|
||
referenced.objectId = attr->atttypid;
|
||
referenced.objectSubId = 0;
|
||
recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
|
||
|
||
/* The default collation is pinned, so don't bother recording it */
|
||
if (OidIsValid(attr->attcollation) &&
|
||
attr->attcollation != DEFAULT_COLLATION_OID)
|
||
{
|
||
referenced.classId = CollationRelationId;
|
||
referenced.objectId = attr->attcollation;
|
||
referenced.objectSubId = 0;
|
||
recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
|
||
}
|
||
}
|
||
|
||
/*
|
||
* Next we add the system attributes. Skip OID if rel has no OIDs. Skip
|
||
* all for a view or type relation. We don't bother with making datatype
|
||
* dependencies here, since presumably all these types are pinned.
|
||
*/
|
||
if (relkind != RELKIND_VIEW && relkind != RELKIND_COMPOSITE_TYPE)
|
||
{
|
||
for (i = 0; i < (int) lengthof(SysAtt); i++)
|
||
{
|
||
FormData_pg_attribute attStruct;
|
||
|
||
/* skip OID where appropriate */
|
||
if (!tupdesc->tdhasoid &&
|
||
SysAtt[i]->attnum == ObjectIdAttributeNumber)
|
||
continue;
|
||
|
||
memcpy(&attStruct, (char *) SysAtt[i], sizeof(FormData_pg_attribute));
|
||
|
||
/* Fill in the correct relation OID in the copied tuple */
|
||
attStruct.attrelid = new_rel_oid;
|
||
|
||
/* Fill in correct inheritance info for the OID column */
|
||
if (attStruct.attnum == ObjectIdAttributeNumber)
|
||
{
|
||
attStruct.attislocal = oidislocal;
|
||
attStruct.attinhcount = oidinhcount;
|
||
}
|
||
|
||
InsertPgAttributeTuple(rel, &attStruct, indstate);
|
||
}
|
||
}
|
||
|
||
/*
|
||
* clean up
|
||
*/
|
||
CatalogCloseIndexes(indstate);
|
||
|
||
heap_close(rel, RowExclusiveLock);
|
||
}
|
||
|
||
/* --------------------------------
|
||
* InsertPgClassTuple
|
||
*
|
||
* Construct and insert a new tuple in pg_class.
|
||
*
|
||
* Caller has already opened and locked pg_class.
|
||
* Tuple data is taken from new_rel_desc->rd_rel, except for the
|
||
* variable-width fields which are not present in a cached reldesc.
|
||
* relacl and reloptions are passed in Datum form (to avoid having
|
||
* to reference the data types in heap.h). Pass (Datum) 0 to set them
|
||
* to NULL.
|
||
* --------------------------------
|
||
*/
|
||
void
|
||
InsertPgClassTuple(Relation pg_class_desc,
|
||
Relation new_rel_desc,
|
||
Oid new_rel_oid,
|
||
Datum relacl,
|
||
Datum reloptions)
|
||
{
|
||
Form_pg_class rd_rel = new_rel_desc->rd_rel;
|
||
Datum values[Natts_pg_class];
|
||
bool nulls[Natts_pg_class];
|
||
HeapTuple tup;
|
||
|
||
/* This is a tad tedious, but way cleaner than what we used to do... */
|
||
memset(values, 0, sizeof(values));
|
||
memset(nulls, false, sizeof(nulls));
|
||
|
||
values[Anum_pg_class_relname - 1] = NameGetDatum(&rd_rel->relname);
|
||
values[Anum_pg_class_relnamespace - 1] = ObjectIdGetDatum(rd_rel->relnamespace);
|
||
values[Anum_pg_class_reltype - 1] = ObjectIdGetDatum(rd_rel->reltype);
|
||
values[Anum_pg_class_reloftype - 1] = ObjectIdGetDatum(rd_rel->reloftype);
|
||
values[Anum_pg_class_relowner - 1] = ObjectIdGetDatum(rd_rel->relowner);
|
||
values[Anum_pg_class_relam - 1] = ObjectIdGetDatum(rd_rel->relam);
|
||
values[Anum_pg_class_relfilenode - 1] = ObjectIdGetDatum(rd_rel->relfilenode);
|
||
values[Anum_pg_class_reltablespace - 1] = ObjectIdGetDatum(rd_rel->reltablespace);
|
||
values[Anum_pg_class_relpages - 1] = Int32GetDatum(rd_rel->relpages);
|
||
values[Anum_pg_class_reltuples - 1] = Float4GetDatum(rd_rel->reltuples);
|
||
values[Anum_pg_class_relallvisible - 1] = Int32GetDatum(rd_rel->relallvisible);
|
||
values[Anum_pg_class_reltoastrelid - 1] = ObjectIdGetDatum(rd_rel->reltoastrelid);
|
||
values[Anum_pg_class_relhasindex - 1] = BoolGetDatum(rd_rel->relhasindex);
|
||
values[Anum_pg_class_relisshared - 1] = BoolGetDatum(rd_rel->relisshared);
|
||
values[Anum_pg_class_relpersistence - 1] = CharGetDatum(rd_rel->relpersistence);
|
||
values[Anum_pg_class_relkind - 1] = CharGetDatum(rd_rel->relkind);
|
||
values[Anum_pg_class_relnatts - 1] = Int16GetDatum(rd_rel->relnatts);
|
||
values[Anum_pg_class_relchecks - 1] = Int16GetDatum(rd_rel->relchecks);
|
||
values[Anum_pg_class_relhasoids - 1] = BoolGetDatum(rd_rel->relhasoids);
|
||
values[Anum_pg_class_relhaspkey - 1] = BoolGetDatum(rd_rel->relhaspkey);
|
||
values[Anum_pg_class_relhasrules - 1] = BoolGetDatum(rd_rel->relhasrules);
|
||
values[Anum_pg_class_relhastriggers - 1] = BoolGetDatum(rd_rel->relhastriggers);
|
||
values[Anum_pg_class_relrowsecurity - 1] = BoolGetDatum(rd_rel->relrowsecurity);
|
||
values[Anum_pg_class_relforcerowsecurity - 1] = BoolGetDatum(rd_rel->relforcerowsecurity);
|
||
values[Anum_pg_class_relhassubclass - 1] = BoolGetDatum(rd_rel->relhassubclass);
|
||
values[Anum_pg_class_relispopulated - 1] = BoolGetDatum(rd_rel->relispopulated);
|
||
values[Anum_pg_class_relreplident - 1] = CharGetDatum(rd_rel->relreplident);
|
||
values[Anum_pg_class_relispartition - 1] = BoolGetDatum(rd_rel->relispartition);
|
||
values[Anum_pg_class_relfrozenxid - 1] = TransactionIdGetDatum(rd_rel->relfrozenxid);
|
||
values[Anum_pg_class_relminmxid - 1] = MultiXactIdGetDatum(rd_rel->relminmxid);
|
||
if (relacl != (Datum) 0)
|
||
values[Anum_pg_class_relacl - 1] = relacl;
|
||
else
|
||
nulls[Anum_pg_class_relacl - 1] = true;
|
||
if (reloptions != (Datum) 0)
|
||
values[Anum_pg_class_reloptions - 1] = reloptions;
|
||
else
|
||
nulls[Anum_pg_class_reloptions - 1] = true;
|
||
|
||
/* relpartbound is set by updating this tuple, if necessary */
|
||
nulls[Anum_pg_class_relpartbound - 1] = true;
|
||
|
||
tup = heap_form_tuple(RelationGetDescr(pg_class_desc), values, nulls);
|
||
|
||
/*
|
||
* The new tuple must have the oid already chosen for the rel. Sure would
|
||
* be embarrassing to do this sort of thing in polite company.
|
||
*/
|
||
HeapTupleSetOid(tup, new_rel_oid);
|
||
|
||
/* finally insert the new tuple, update the indexes, and clean up */
|
||
CatalogTupleInsert(pg_class_desc, tup);
|
||
|
||
heap_freetuple(tup);
|
||
}
|
||
|
||
/* --------------------------------
|
||
* AddNewRelationTuple
|
||
*
|
||
* this registers the new relation in the catalogs by
|
||
* adding a tuple to pg_class.
|
||
* --------------------------------
|
||
*/
|
||
static void
|
||
AddNewRelationTuple(Relation pg_class_desc,
|
||
Relation new_rel_desc,
|
||
Oid new_rel_oid,
|
||
Oid new_type_oid,
|
||
Oid reloftype,
|
||
Oid relowner,
|
||
char relkind,
|
||
Datum relacl,
|
||
Datum reloptions)
|
||
{
|
||
Form_pg_class new_rel_reltup;
|
||
|
||
/*
|
||
* first we update some of the information in our uncataloged relation's
|
||
* relation descriptor.
|
||
*/
|
||
new_rel_reltup = new_rel_desc->rd_rel;
|
||
|
||
switch (relkind)
|
||
{
|
||
case RELKIND_RELATION:
|
||
case RELKIND_MATVIEW:
|
||
case RELKIND_INDEX:
|
||
case RELKIND_TOASTVALUE:
|
||
/* The relation is real, but as yet empty */
|
||
new_rel_reltup->relpages = 0;
|
||
new_rel_reltup->reltuples = 0;
|
||
new_rel_reltup->relallvisible = 0;
|
||
break;
|
||
case RELKIND_SEQUENCE:
|
||
/* Sequences always have a known size */
|
||
new_rel_reltup->relpages = 1;
|
||
new_rel_reltup->reltuples = 1;
|
||
new_rel_reltup->relallvisible = 0;
|
||
break;
|
||
default:
|
||
/* Views, etc, have no disk storage */
|
||
new_rel_reltup->relpages = 0;
|
||
new_rel_reltup->reltuples = 0;
|
||
new_rel_reltup->relallvisible = 0;
|
||
break;
|
||
}
|
||
|
||
/* Initialize relfrozenxid and relminmxid */
|
||
if (relkind == RELKIND_RELATION ||
|
||
relkind == RELKIND_MATVIEW ||
|
||
relkind == RELKIND_TOASTVALUE)
|
||
{
|
||
/*
|
||
* Initialize to the minimum XID that could put tuples in the table.
|
||
* We know that no xacts older than RecentXmin are still running, so
|
||
* that will do.
|
||
*/
|
||
new_rel_reltup->relfrozenxid = RecentXmin;
|
||
|
||
/*
|
||
* Similarly, initialize the minimum Multixact to the first value that
|
||
* could possibly be stored in tuples in the table. Running
|
||
* transactions could reuse values from their local cache, so we are
|
||
* careful to consider all currently running multis.
|
||
*
|
||
* XXX this could be refined further, but is it worth the hassle?
|
||
*/
|
||
new_rel_reltup->relminmxid = GetOldestMultiXactId();
|
||
}
|
||
else
|
||
{
|
||
/*
|
||
* Other relation types will not contain XIDs, so set relfrozenxid to
|
||
* InvalidTransactionId. (Note: a sequence does contain a tuple, but
|
||
* we force its xmin to be FrozenTransactionId always; see
|
||
* commands/sequence.c.)
|
||
*/
|
||
new_rel_reltup->relfrozenxid = InvalidTransactionId;
|
||
new_rel_reltup->relminmxid = InvalidMultiXactId;
|
||
}
|
||
|
||
new_rel_reltup->relowner = relowner;
|
||
new_rel_reltup->reltype = new_type_oid;
|
||
new_rel_reltup->reloftype = reloftype;
|
||
|
||
/* relispartition is always set by updating this tuple later */
|
||
new_rel_reltup->relispartition = false;
|
||
|
||
new_rel_desc->rd_att->tdtypeid = new_type_oid;
|
||
|
||
/* Now build and insert the tuple */
|
||
InsertPgClassTuple(pg_class_desc, new_rel_desc, new_rel_oid,
|
||
relacl, reloptions);
|
||
}
|
||
|
||
|
||
/* --------------------------------
|
||
* AddNewRelationType -
|
||
*
|
||
* define a composite type corresponding to the new relation
|
||
* --------------------------------
|
||
*/
|
||
static ObjectAddress
|
||
AddNewRelationType(const char *typeName,
|
||
Oid typeNamespace,
|
||
Oid new_rel_oid,
|
||
char new_rel_kind,
|
||
Oid ownerid,
|
||
Oid new_row_type,
|
||
Oid new_array_type)
|
||
{
|
||
return
|
||
TypeCreate(new_row_type, /* optional predetermined OID */
|
||
typeName, /* type name */
|
||
typeNamespace, /* type namespace */
|
||
new_rel_oid, /* relation oid */
|
||
new_rel_kind, /* relation kind */
|
||
ownerid, /* owner's ID */
|
||
-1, /* internal size (varlena) */
|
||
TYPTYPE_COMPOSITE, /* type-type (composite) */
|
||
TYPCATEGORY_COMPOSITE, /* type-category (ditto) */
|
||
false, /* composite types are never preferred */
|
||
DEFAULT_TYPDELIM, /* default array delimiter */
|
||
F_RECORD_IN, /* input procedure */
|
||
F_RECORD_OUT, /* output procedure */
|
||
F_RECORD_RECV, /* receive procedure */
|
||
F_RECORD_SEND, /* send procedure */
|
||
InvalidOid, /* typmodin procedure - none */
|
||
InvalidOid, /* typmodout procedure - none */
|
||
InvalidOid, /* analyze procedure - default */
|
||
InvalidOid, /* array element type - irrelevant */
|
||
false, /* this is not an array type */
|
||
new_array_type, /* array type if any */
|
||
InvalidOid, /* domain base type - irrelevant */
|
||
NULL, /* default value - none */
|
||
NULL, /* default binary representation */
|
||
false, /* passed by reference */
|
||
'd', /* alignment - must be the largest! */
|
||
'x', /* fully TOASTable */
|
||
-1, /* typmod */
|
||
0, /* array dimensions for typBaseType */
|
||
false, /* Type NOT NULL */
|
||
InvalidOid); /* rowtypes never have a collation */
|
||
}
|
||
|
||
/* --------------------------------
|
||
* heap_create_with_catalog
|
||
*
|
||
* creates a new cataloged relation. see comments above.
|
||
*
|
||
* Arguments:
|
||
* relname: name to give to new rel
|
||
* relnamespace: OID of namespace it goes in
|
||
* reltablespace: OID of tablespace it goes in
|
||
* relid: OID to assign to new rel, or InvalidOid to select a new OID
|
||
* reltypeid: OID to assign to rel's rowtype, or InvalidOid to select one
|
||
* reloftypeid: if a typed table, OID of underlying type; else InvalidOid
|
||
* ownerid: OID of new rel's owner
|
||
* tupdesc: tuple descriptor (source of column definitions)
|
||
* cooked_constraints: list of precooked check constraints and defaults
|
||
* relkind: relkind for new rel
|
||
* relpersistence: rel's persistence status (permanent, temp, or unlogged)
|
||
* shared_relation: true if it's to be a shared relation
|
||
* mapped_relation: true if the relation will use the relfilenode map
|
||
* oidislocal: true if oid column (if any) should be marked attislocal
|
||
* oidinhcount: attinhcount to assign to oid column (if any)
|
||
* oncommit: ON COMMIT marking (only relevant if it's a temp table)
|
||
* reloptions: reloptions in Datum form, or (Datum) 0 if none
|
||
* use_user_acl: true if should look for user-defined default permissions;
|
||
* if false, relacl is always set NULL
|
||
* allow_system_table_mods: true to allow creation in system namespaces
|
||
* is_internal: is this a system-generated catalog?
|
||
*
|
||
* Output parameters:
|
||
* typaddress: if not null, gets the object address of the new pg_type entry
|
||
*
|
||
* Returns the OID of the new relation
|
||
* --------------------------------
|
||
*/
|
||
Oid
|
||
heap_create_with_catalog(const char *relname,
|
||
Oid relnamespace,
|
||
Oid reltablespace,
|
||
Oid relid,
|
||
Oid reltypeid,
|
||
Oid reloftypeid,
|
||
Oid ownerid,
|
||
TupleDesc tupdesc,
|
||
List *cooked_constraints,
|
||
char relkind,
|
||
char relpersistence,
|
||
bool shared_relation,
|
||
bool mapped_relation,
|
||
bool oidislocal,
|
||
int oidinhcount,
|
||
OnCommitAction oncommit,
|
||
Datum reloptions,
|
||
bool use_user_acl,
|
||
bool allow_system_table_mods,
|
||
bool is_internal,
|
||
ObjectAddress *typaddress)
|
||
{
|
||
Relation pg_class_desc;
|
||
Relation new_rel_desc;
|
||
Acl *relacl;
|
||
Oid existing_relid;
|
||
Oid old_type_oid;
|
||
Oid new_type_oid;
|
||
ObjectAddress new_type_addr;
|
||
Oid new_array_oid = InvalidOid;
|
||
|
||
pg_class_desc = heap_open(RelationRelationId, RowExclusiveLock);
|
||
|
||
/*
|
||
* sanity checks
|
||
*/
|
||
Assert(IsNormalProcessingMode() || IsBootstrapProcessingMode());
|
||
|
||
CheckAttributeNamesTypes(tupdesc, relkind, allow_system_table_mods);
|
||
|
||
/*
|
||
* This would fail later on anyway, if the relation already exists. But
|
||
* by catching it here we can emit a nicer error message.
|
||
*/
|
||
existing_relid = get_relname_relid(relname, relnamespace);
|
||
if (existing_relid != InvalidOid)
|
||
ereport(ERROR,
|
||
(errcode(ERRCODE_DUPLICATE_TABLE),
|
||
errmsg("relation \"%s\" already exists", relname)));
|
||
|
||
/*
|
||
* Since we are going to create a rowtype as well, also check for
|
||
* collision with an existing type name. If there is one and it's an
|
||
* autogenerated array, we can rename it out of the way; otherwise we can
|
||
* at least give a good error message.
|
||
*/
|
||
old_type_oid = GetSysCacheOid2(TYPENAMENSP,
|
||
CStringGetDatum(relname),
|
||
ObjectIdGetDatum(relnamespace));
|
||
if (OidIsValid(old_type_oid))
|
||
{
|
||
if (!moveArrayTypeName(old_type_oid, relname, relnamespace))
|
||
ereport(ERROR,
|
||
(errcode(ERRCODE_DUPLICATE_OBJECT),
|
||
errmsg("type \"%s\" already exists", relname),
|
||
errhint("A relation has an associated type of the same name, "
|
||
"so you must use a name that doesn't conflict "
|
||
"with any existing type.")));
|
||
}
|
||
|
||
/*
|
||
* Shared relations must be in pg_global (last-ditch check)
|
||
*/
|
||
if (shared_relation && reltablespace != GLOBALTABLESPACE_OID)
|
||
elog(ERROR, "shared relations must be placed in pg_global tablespace");
|
||
|
||
/*
|
||
* Allocate an OID for the relation, unless we were told what to use.
|
||
*
|
||
* The OID will be the relfilenode as well, so make sure it doesn't
|
||
* collide with either pg_class OIDs or existing physical files.
|
||
*/
|
||
if (!OidIsValid(relid))
|
||
{
|
||
/* Use binary-upgrade override for pg_class.oid/relfilenode? */
|
||
if (IsBinaryUpgrade &&
|
||
(relkind == RELKIND_RELATION || relkind == RELKIND_SEQUENCE ||
|
||
relkind == RELKIND_VIEW || relkind == RELKIND_MATVIEW ||
|
||
relkind == RELKIND_COMPOSITE_TYPE || relkind == RELKIND_FOREIGN_TABLE ||
|
||
relkind == RELKIND_PARTITIONED_TABLE))
|
||
{
|
||
if (!OidIsValid(binary_upgrade_next_heap_pg_class_oid))
|
||
ereport(ERROR,
|
||
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
|
||
errmsg("pg_class heap OID value not set when in binary upgrade mode")));
|
||
|
||
relid = binary_upgrade_next_heap_pg_class_oid;
|
||
binary_upgrade_next_heap_pg_class_oid = InvalidOid;
|
||
}
|
||
/* There might be no TOAST table, so we have to test for it. */
|
||
else if (IsBinaryUpgrade &&
|
||
OidIsValid(binary_upgrade_next_toast_pg_class_oid) &&
|
||
relkind == RELKIND_TOASTVALUE)
|
||
{
|
||
relid = binary_upgrade_next_toast_pg_class_oid;
|
||
binary_upgrade_next_toast_pg_class_oid = InvalidOid;
|
||
}
|
||
else
|
||
relid = GetNewRelFileNode(reltablespace, pg_class_desc,
|
||
relpersistence);
|
||
}
|
||
|
||
/*
|
||
* Determine the relation's initial permissions.
|
||
*/
|
||
if (use_user_acl)
|
||
{
|
||
switch (relkind)
|
||
{
|
||
case RELKIND_RELATION:
|
||
case RELKIND_VIEW:
|
||
case RELKIND_MATVIEW:
|
||
case RELKIND_FOREIGN_TABLE:
|
||
case RELKIND_PARTITIONED_TABLE:
|
||
relacl = get_user_default_acl(OBJECT_TABLE, ownerid,
|
||
relnamespace);
|
||
break;
|
||
case RELKIND_SEQUENCE:
|
||
relacl = get_user_default_acl(OBJECT_SEQUENCE, ownerid,
|
||
relnamespace);
|
||
break;
|
||
default:
|
||
relacl = NULL;
|
||
break;
|
||
}
|
||
}
|
||
else
|
||
relacl = NULL;
|
||
|
||
/*
|
||
* Create the relcache entry (mostly dummy at this point) and the physical
|
||
* disk file. (If we fail further down, it's the smgr's responsibility to
|
||
* remove the disk file again.)
|
||
*/
|
||
new_rel_desc = heap_create(relname,
|
||
relnamespace,
|
||
reltablespace,
|
||
relid,
|
||
InvalidOid,
|
||
tupdesc,
|
||
relkind,
|
||
relpersistence,
|
||
shared_relation,
|
||
mapped_relation,
|
||
allow_system_table_mods);
|
||
|
||
Assert(relid == RelationGetRelid(new_rel_desc));
|
||
|
||
/*
|
||
* Decide whether to create an array type over the relation's rowtype. We
|
||
* do not create any array types for system catalogs (ie, those made
|
||
* during initdb). We do not create them where the use of a relation as
|
||
* such is an implementation detail: toast tables, sequences and indexes.
|
||
*/
|
||
if (IsUnderPostmaster && (relkind == RELKIND_RELATION ||
|
||
relkind == RELKIND_VIEW ||
|
||
relkind == RELKIND_MATVIEW ||
|
||
relkind == RELKIND_FOREIGN_TABLE ||
|
||
relkind == RELKIND_COMPOSITE_TYPE ||
|
||
relkind == RELKIND_PARTITIONED_TABLE))
|
||
new_array_oid = AssignTypeArrayOid();
|
||
|
||
/*
|
||
* Since defining a relation also defines a complex type, we add a new
|
||
* system type corresponding to the new relation. The OID of the type can
|
||
* be preselected by the caller, but if reltypeid is InvalidOid, we'll
|
||
* generate a new OID for it.
|
||
*
|
||
* NOTE: we could get a unique-index failure here, in case someone else is
|
||
* creating the same type name in parallel but hadn't committed yet when
|
||
* we checked for a duplicate name above.
|
||
*/
|
||
new_type_addr = AddNewRelationType(relname,
|
||
relnamespace,
|
||
relid,
|
||
relkind,
|
||
ownerid,
|
||
reltypeid,
|
||
new_array_oid);
|
||
new_type_oid = new_type_addr.objectId;
|
||
if (typaddress)
|
||
*typaddress = new_type_addr;
|
||
|
||
/*
|
||
* Now make the array type if wanted.
|
||
*/
|
||
if (OidIsValid(new_array_oid))
|
||
{
|
||
char *relarrayname;
|
||
|
||
relarrayname = makeArrayTypeName(relname, relnamespace);
|
||
|
||
TypeCreate(new_array_oid, /* force the type's OID to this */
|
||
relarrayname, /* Array type name */
|
||
relnamespace, /* Same namespace as parent */
|
||
InvalidOid, /* Not composite, no relationOid */
|
||
0, /* relkind, also N/A here */
|
||
ownerid, /* owner's ID */
|
||
-1, /* Internal size (varlena) */
|
||
TYPTYPE_BASE, /* Not composite - typelem is */
|
||
TYPCATEGORY_ARRAY, /* type-category (array) */
|
||
false, /* array types are never preferred */
|
||
DEFAULT_TYPDELIM, /* default array delimiter */
|
||
F_ARRAY_IN, /* array input proc */
|
||
F_ARRAY_OUT, /* array output proc */
|
||
F_ARRAY_RECV, /* array recv (bin) proc */
|
||
F_ARRAY_SEND, /* array send (bin) proc */
|
||
InvalidOid, /* typmodin procedure - none */
|
||
InvalidOid, /* typmodout procedure - none */
|
||
F_ARRAY_TYPANALYZE, /* array analyze procedure */
|
||
new_type_oid, /* array element type - the rowtype */
|
||
true, /* yes, this is an array type */
|
||
InvalidOid, /* this has no array type */
|
||
InvalidOid, /* domain base type - irrelevant */
|
||
NULL, /* default value - none */
|
||
NULL, /* default binary representation */
|
||
false, /* passed by reference */
|
||
'd', /* alignment - must be the largest! */
|
||
'x', /* fully TOASTable */
|
||
-1, /* typmod */
|
||
0, /* array dimensions for typBaseType */
|
||
false, /* Type NOT NULL */
|
||
InvalidOid); /* rowtypes never have a collation */
|
||
|
||
pfree(relarrayname);
|
||
}
|
||
|
||
/*
|
||
* now create an entry in pg_class for the relation.
|
||
*
|
||
* NOTE: we could get a unique-index failure here, in case someone else is
|
||
* creating the same relation name in parallel but hadn't committed yet
|
||
* when we checked for a duplicate name above.
|
||
*/
|
||
AddNewRelationTuple(pg_class_desc,
|
||
new_rel_desc,
|
||
relid,
|
||
new_type_oid,
|
||
reloftypeid,
|
||
ownerid,
|
||
relkind,
|
||
PointerGetDatum(relacl),
|
||
reloptions);
|
||
|
||
/*
|
||
* now add tuples to pg_attribute for the attributes in our new relation.
|
||
*/
|
||
AddNewAttributeTuples(relid, new_rel_desc->rd_att, relkind,
|
||
oidislocal, oidinhcount);
|
||
|
||
/*
|
||
* Make a dependency link to force the relation to be deleted if its
|
||
* namespace is. Also make a dependency link to its owner, as well as
|
||
* dependencies for any roles mentioned in the default ACL.
|
||
*
|
||
* For composite types, these dependencies are tracked for the pg_type
|
||
* entry, so we needn't record them here. Likewise, TOAST tables don't
|
||
* need a namespace dependency (they live in a pinned namespace) nor an
|
||
* owner dependency (they depend indirectly through the parent table), nor
|
||
* should they have any ACL entries. The same applies for extension
|
||
* dependencies.
|
||
*
|
||
* Also, skip this in bootstrap mode, since we don't make dependencies
|
||
* while bootstrapping.
|
||
*/
|
||
if (relkind != RELKIND_COMPOSITE_TYPE &&
|
||
relkind != RELKIND_TOASTVALUE &&
|
||
!IsBootstrapProcessingMode())
|
||
{
|
||
ObjectAddress myself,
|
||
referenced;
|
||
|
||
myself.classId = RelationRelationId;
|
||
myself.objectId = relid;
|
||
myself.objectSubId = 0;
|
||
referenced.classId = NamespaceRelationId;
|
||
referenced.objectId = relnamespace;
|
||
referenced.objectSubId = 0;
|
||
recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
|
||
|
||
recordDependencyOnOwner(RelationRelationId, relid, ownerid);
|
||
|
||
recordDependencyOnCurrentExtension(&myself, false);
|
||
|
||
if (reloftypeid)
|
||
{
|
||
referenced.classId = TypeRelationId;
|
||
referenced.objectId = reloftypeid;
|
||
referenced.objectSubId = 0;
|
||
recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
|
||
}
|
||
|
||
if (relacl != NULL)
|
||
{
|
||
int nnewmembers;
|
||
Oid *newmembers;
|
||
|
||
nnewmembers = aclmembers(relacl, &newmembers);
|
||
updateAclDependencies(RelationRelationId, relid, 0,
|
||
ownerid,
|
||
0, NULL,
|
||
nnewmembers, newmembers);
|
||
}
|
||
}
|
||
|
||
/* Post creation hook for new relation */
|
||
InvokeObjectPostCreateHookArg(RelationRelationId, relid, 0, is_internal);
|
||
|
||
/*
|
||
* Store any supplied constraints and defaults.
|
||
*
|
||
* NB: this may do a CommandCounterIncrement and rebuild the relcache
|
||
* entry, so the relation must be valid and self-consistent at this point.
|
||
* In particular, there are not yet constraints and defaults anywhere.
|
||
*/
|
||
StoreConstraints(new_rel_desc, cooked_constraints, is_internal);
|
||
|
||
/*
|
||
* If there's a special on-commit action, remember it
|
||
*/
|
||
if (oncommit != ONCOMMIT_NOOP)
|
||
register_on_commit_action(relid, oncommit);
|
||
|
||
/*
|
||
* Unlogged objects need an init fork, except for partitioned tables which
|
||
* have no storage at all.
|
||
*/
|
||
if (relpersistence == RELPERSISTENCE_UNLOGGED &&
|
||
relkind != RELKIND_PARTITIONED_TABLE)
|
||
heap_create_init_fork(new_rel_desc);
|
||
|
||
/*
|
||
* ok, the relation has been cataloged, so close our relations and return
|
||
* the OID of the newly created relation.
|
||
*/
|
||
heap_close(new_rel_desc, NoLock); /* do not unlock till end of xact */
|
||
heap_close(pg_class_desc, RowExclusiveLock);
|
||
|
||
return relid;
|
||
}
|
||
|
||
/*
|
||
* Set up an init fork for an unlogged table so that it can be correctly
|
||
* reinitialized on restart. An immediate sync is required even if the
|
||
* page has been logged, because the write did not go through
|
||
* shared_buffers and therefore a concurrent checkpoint may have moved
|
||
* the redo pointer past our xlog record. Recovery may as well remove it
|
||
* while replaying, for example, XLOG_DBASE_CREATE or XLOG_TBLSPC_CREATE
|
||
* record. Therefore, logging is necessary even if wal_level=minimal.
|
||
*/
|
||
void
|
||
heap_create_init_fork(Relation rel)
|
||
{
|
||
Assert(rel->rd_rel->relkind == RELKIND_RELATION ||
|
||
rel->rd_rel->relkind == RELKIND_MATVIEW ||
|
||
rel->rd_rel->relkind == RELKIND_TOASTVALUE);
|
||
RelationOpenSmgr(rel);
|
||
smgrcreate(rel->rd_smgr, INIT_FORKNUM, false);
|
||
log_smgrcreate(&rel->rd_smgr->smgr_rnode.node, INIT_FORKNUM);
|
||
smgrimmedsync(rel->rd_smgr, INIT_FORKNUM);
|
||
}
|
||
|
||
/*
|
||
* RelationRemoveInheritance
|
||
*
|
||
* Formerly, this routine checked for child relations and aborted the
|
||
* deletion if any were found. Now we rely on the dependency mechanism
|
||
* to check for or delete child relations. By the time we get here,
|
||
* there are no children and we need only remove any pg_inherits rows
|
||
* linking this relation to its parent(s).
|
||
*/
|
||
static void
|
||
RelationRemoveInheritance(Oid relid)
|
||
{
|
||
Relation catalogRelation;
|
||
SysScanDesc scan;
|
||
ScanKeyData key;
|
||
HeapTuple tuple;
|
||
|
||
catalogRelation = heap_open(InheritsRelationId, RowExclusiveLock);
|
||
|
||
ScanKeyInit(&key,
|
||
Anum_pg_inherits_inhrelid,
|
||
BTEqualStrategyNumber, F_OIDEQ,
|
||
ObjectIdGetDatum(relid));
|
||
|
||
scan = systable_beginscan(catalogRelation, InheritsRelidSeqnoIndexId, true,
|
||
NULL, 1, &key);
|
||
|
||
while (HeapTupleIsValid(tuple = systable_getnext(scan)))
|
||
CatalogTupleDelete(catalogRelation, &tuple->t_self);
|
||
|
||
systable_endscan(scan);
|
||
heap_close(catalogRelation, RowExclusiveLock);
|
||
}
|
||
|
||
/*
|
||
* DeleteRelationTuple
|
||
*
|
||
* Remove pg_class row for the given relid.
|
||
*
|
||
* Note: this is shared by relation deletion and index deletion. It's
|
||
* not intended for use anyplace else.
|
||
*/
|
||
void
|
||
DeleteRelationTuple(Oid relid)
|
||
{
|
||
Relation pg_class_desc;
|
||
HeapTuple tup;
|
||
|
||
/* Grab an appropriate lock on the pg_class relation */
|
||
pg_class_desc = heap_open(RelationRelationId, RowExclusiveLock);
|
||
|
||
tup = SearchSysCache1(RELOID, ObjectIdGetDatum(relid));
|
||
if (!HeapTupleIsValid(tup))
|
||
elog(ERROR, "cache lookup failed for relation %u", relid);
|
||
|
||
/* delete the relation tuple from pg_class, and finish up */
|
||
CatalogTupleDelete(pg_class_desc, &tup->t_self);
|
||
|
||
ReleaseSysCache(tup);
|
||
|
||
heap_close(pg_class_desc, RowExclusiveLock);
|
||
}
|
||
|
||
/*
|
||
* DeleteAttributeTuples
|
||
*
|
||
* Remove pg_attribute rows for the given relid.
|
||
*
|
||
* Note: this is shared by relation deletion and index deletion. It's
|
||
* not intended for use anyplace else.
|
||
*/
|
||
void
|
||
DeleteAttributeTuples(Oid relid)
|
||
{
|
||
Relation attrel;
|
||
SysScanDesc scan;
|
||
ScanKeyData key[1];
|
||
HeapTuple atttup;
|
||
|
||
/* Grab an appropriate lock on the pg_attribute relation */
|
||
attrel = heap_open(AttributeRelationId, RowExclusiveLock);
|
||
|
||
/* Use the index to scan only attributes of the target relation */
|
||
ScanKeyInit(&key[0],
|
||
Anum_pg_attribute_attrelid,
|
||
BTEqualStrategyNumber, F_OIDEQ,
|
||
ObjectIdGetDatum(relid));
|
||
|
||
scan = systable_beginscan(attrel, AttributeRelidNumIndexId, true,
|
||
NULL, 1, key);
|
||
|
||
/* Delete all the matching tuples */
|
||
while ((atttup = systable_getnext(scan)) != NULL)
|
||
CatalogTupleDelete(attrel, &atttup->t_self);
|
||
|
||
/* Clean up after the scan */
|
||
systable_endscan(scan);
|
||
heap_close(attrel, RowExclusiveLock);
|
||
}
|
||
|
||
/*
|
||
* DeleteSystemAttributeTuples
|
||
*
|
||
* Remove pg_attribute rows for system columns of the given relid.
|
||
*
|
||
* Note: this is only used when converting a table to a view. Views don't
|
||
* have system columns, so we should remove them from pg_attribute.
|
||
*/
|
||
void
|
||
DeleteSystemAttributeTuples(Oid relid)
|
||
{
|
||
Relation attrel;
|
||
SysScanDesc scan;
|
||
ScanKeyData key[2];
|
||
HeapTuple atttup;
|
||
|
||
/* Grab an appropriate lock on the pg_attribute relation */
|
||
attrel = heap_open(AttributeRelationId, RowExclusiveLock);
|
||
|
||
/* Use the index to scan only system attributes of the target relation */
|
||
ScanKeyInit(&key[0],
|
||
Anum_pg_attribute_attrelid,
|
||
BTEqualStrategyNumber, F_OIDEQ,
|
||
ObjectIdGetDatum(relid));
|
||
ScanKeyInit(&key[1],
|
||
Anum_pg_attribute_attnum,
|
||
BTLessEqualStrategyNumber, F_INT2LE,
|
||
Int16GetDatum(0));
|
||
|
||
scan = systable_beginscan(attrel, AttributeRelidNumIndexId, true,
|
||
NULL, 2, key);
|
||
|
||
/* Delete all the matching tuples */
|
||
while ((atttup = systable_getnext(scan)) != NULL)
|
||
CatalogTupleDelete(attrel, &atttup->t_self);
|
||
|
||
/* Clean up after the scan */
|
||
systable_endscan(scan);
|
||
heap_close(attrel, RowExclusiveLock);
|
||
}
|
||
|
||
/*
|
||
* RemoveAttributeById
|
||
*
|
||
* This is the guts of ALTER TABLE DROP COLUMN: actually mark the attribute
|
||
* deleted in pg_attribute. We also remove pg_statistic entries for it.
|
||
* (Everything else needed, such as getting rid of any pg_attrdef entry,
|
||
* is handled by dependency.c.)
|
||
*/
|
||
void
|
||
RemoveAttributeById(Oid relid, AttrNumber attnum)
|
||
{
|
||
Relation rel;
|
||
Relation attr_rel;
|
||
HeapTuple tuple;
|
||
Form_pg_attribute attStruct;
|
||
char newattname[NAMEDATALEN];
|
||
|
||
/*
|
||
* Grab an exclusive lock on the target table, which we will NOT release
|
||
* until end of transaction. (In the simple case where we are directly
|
||
* dropping this column, AlterTableDropColumn already did this ... but
|
||
* when cascading from a drop of some other object, we may not have any
|
||
* lock.)
|
||
*/
|
||
rel = relation_open(relid, AccessExclusiveLock);
|
||
|
||
attr_rel = heap_open(AttributeRelationId, RowExclusiveLock);
|
||
|
||
tuple = SearchSysCacheCopy2(ATTNUM,
|
||
ObjectIdGetDatum(relid),
|
||
Int16GetDatum(attnum));
|
||
if (!HeapTupleIsValid(tuple)) /* shouldn't happen */
|
||
elog(ERROR, "cache lookup failed for attribute %d of relation %u",
|
||
attnum, relid);
|
||
attStruct = (Form_pg_attribute) GETSTRUCT(tuple);
|
||
|
||
if (attnum < 0)
|
||
{
|
||
/* System attribute (probably OID) ... just delete the row */
|
||
|
||
CatalogTupleDelete(attr_rel, &tuple->t_self);
|
||
}
|
||
else
|
||
{
|
||
/* Dropping user attributes is lots harder */
|
||
|
||
/* Mark the attribute as dropped */
|
||
attStruct->attisdropped = true;
|
||
|
||
/*
|
||
* Set the type OID to invalid. A dropped attribute's type link
|
||
* cannot be relied on (once the attribute is dropped, the type might
|
||
* be too). Fortunately we do not need the type row --- the only
|
||
* really essential information is the type's typlen and typalign,
|
||
* which are preserved in the attribute's attlen and attalign. We set
|
||
* atttypid to zero here as a means of catching code that incorrectly
|
||
* expects it to be valid.
|
||
*/
|
||
attStruct->atttypid = InvalidOid;
|
||
|
||
/* Remove any NOT NULL constraint the column may have */
|
||
attStruct->attnotnull = false;
|
||
|
||
/* We don't want to keep stats for it anymore */
|
||
attStruct->attstattarget = 0;
|
||
|
||
/*
|
||
* Change the column name to something that isn't likely to conflict
|
||
*/
|
||
snprintf(newattname, sizeof(newattname),
|
||
"........pg.dropped.%d........", attnum);
|
||
namestrcpy(&(attStruct->attname), newattname);
|
||
|
||
CatalogTupleUpdate(attr_rel, &tuple->t_self, tuple);
|
||
}
|
||
|
||
/*
|
||
* Because updating the pg_attribute row will trigger a relcache flush for
|
||
* the target relation, we need not do anything else to notify other
|
||
* backends of the change.
|
||
*/
|
||
|
||
heap_close(attr_rel, RowExclusiveLock);
|
||
|
||
if (attnum > 0)
|
||
RemoveStatistics(relid, attnum);
|
||
|
||
relation_close(rel, NoLock);
|
||
}
|
||
|
||
/*
|
||
* RemoveAttrDefault
|
||
*
|
||
* If the specified relation/attribute has a default, remove it.
|
||
* (If no default, raise error if complain is true, else return quietly.)
|
||
*/
|
||
void
|
||
RemoveAttrDefault(Oid relid, AttrNumber attnum,
|
||
DropBehavior behavior, bool complain, bool internal)
|
||
{
|
||
Relation attrdef_rel;
|
||
ScanKeyData scankeys[2];
|
||
SysScanDesc scan;
|
||
HeapTuple tuple;
|
||
bool found = false;
|
||
|
||
attrdef_rel = heap_open(AttrDefaultRelationId, RowExclusiveLock);
|
||
|
||
ScanKeyInit(&scankeys[0],
|
||
Anum_pg_attrdef_adrelid,
|
||
BTEqualStrategyNumber, F_OIDEQ,
|
||
ObjectIdGetDatum(relid));
|
||
ScanKeyInit(&scankeys[1],
|
||
Anum_pg_attrdef_adnum,
|
||
BTEqualStrategyNumber, F_INT2EQ,
|
||
Int16GetDatum(attnum));
|
||
|
||
scan = systable_beginscan(attrdef_rel, AttrDefaultIndexId, true,
|
||
NULL, 2, scankeys);
|
||
|
||
/* There should be at most one matching tuple, but we loop anyway */
|
||
while (HeapTupleIsValid(tuple = systable_getnext(scan)))
|
||
{
|
||
ObjectAddress object;
|
||
|
||
object.classId = AttrDefaultRelationId;
|
||
object.objectId = HeapTupleGetOid(tuple);
|
||
object.objectSubId = 0;
|
||
|
||
performDeletion(&object, behavior,
|
||
internal ? PERFORM_DELETION_INTERNAL : 0);
|
||
|
||
found = true;
|
||
}
|
||
|
||
systable_endscan(scan);
|
||
heap_close(attrdef_rel, RowExclusiveLock);
|
||
|
||
if (complain && !found)
|
||
elog(ERROR, "could not find attrdef tuple for relation %u attnum %d",
|
||
relid, attnum);
|
||
}
|
||
|
||
/*
|
||
* RemoveAttrDefaultById
|
||
*
|
||
* Remove a pg_attrdef entry specified by OID. This is the guts of
|
||
* attribute-default removal. Note it should be called via performDeletion,
|
||
* not directly.
|
||
*/
|
||
void
|
||
RemoveAttrDefaultById(Oid attrdefId)
|
||
{
|
||
Relation attrdef_rel;
|
||
Relation attr_rel;
|
||
Relation myrel;
|
||
ScanKeyData scankeys[1];
|
||
SysScanDesc scan;
|
||
HeapTuple tuple;
|
||
Oid myrelid;
|
||
AttrNumber myattnum;
|
||
|
||
/* Grab an appropriate lock on the pg_attrdef relation */
|
||
attrdef_rel = heap_open(AttrDefaultRelationId, RowExclusiveLock);
|
||
|
||
/* Find the pg_attrdef tuple */
|
||
ScanKeyInit(&scankeys[0],
|
||
ObjectIdAttributeNumber,
|
||
BTEqualStrategyNumber, F_OIDEQ,
|
||
ObjectIdGetDatum(attrdefId));
|
||
|
||
scan = systable_beginscan(attrdef_rel, AttrDefaultOidIndexId, true,
|
||
NULL, 1, scankeys);
|
||
|
||
tuple = systable_getnext(scan);
|
||
if (!HeapTupleIsValid(tuple))
|
||
elog(ERROR, "could not find tuple for attrdef %u", attrdefId);
|
||
|
||
myrelid = ((Form_pg_attrdef) GETSTRUCT(tuple))->adrelid;
|
||
myattnum = ((Form_pg_attrdef) GETSTRUCT(tuple))->adnum;
|
||
|
||
/* Get an exclusive lock on the relation owning the attribute */
|
||
myrel = relation_open(myrelid, AccessExclusiveLock);
|
||
|
||
/* Now we can delete the pg_attrdef row */
|
||
CatalogTupleDelete(attrdef_rel, &tuple->t_self);
|
||
|
||
systable_endscan(scan);
|
||
heap_close(attrdef_rel, RowExclusiveLock);
|
||
|
||
/* Fix the pg_attribute row */
|
||
attr_rel = heap_open(AttributeRelationId, RowExclusiveLock);
|
||
|
||
tuple = SearchSysCacheCopy2(ATTNUM,
|
||
ObjectIdGetDatum(myrelid),
|
||
Int16GetDatum(myattnum));
|
||
if (!HeapTupleIsValid(tuple)) /* shouldn't happen */
|
||
elog(ERROR, "cache lookup failed for attribute %d of relation %u",
|
||
myattnum, myrelid);
|
||
|
||
((Form_pg_attribute) GETSTRUCT(tuple))->atthasdef = false;
|
||
|
||
CatalogTupleUpdate(attr_rel, &tuple->t_self, tuple);
|
||
|
||
/*
|
||
* Our update of the pg_attribute row will force a relcache rebuild, so
|
||
* there's nothing else to do here.
|
||
*/
|
||
heap_close(attr_rel, RowExclusiveLock);
|
||
|
||
/* Keep lock on attribute's rel until end of xact */
|
||
relation_close(myrel, NoLock);
|
||
}
|
||
|
||
/*
|
||
* heap_drop_with_catalog - removes specified relation from catalogs
|
||
*
|
||
* Note that this routine is not responsible for dropping objects that are
|
||
* linked to the pg_class entry via dependencies (for example, indexes and
|
||
* constraints). Those are deleted by the dependency-tracing logic in
|
||
* dependency.c before control gets here. In general, therefore, this routine
|
||
* should never be called directly; go through performDeletion() instead.
|
||
*/
|
||
void
|
||
heap_drop_with_catalog(Oid relid)
|
||
{
|
||
Relation rel;
|
||
HeapTuple tuple;
|
||
Oid parentOid = InvalidOid,
|
||
defaultPartOid = InvalidOid;
|
||
|
||
/*
|
||
* To drop a partition safely, we must grab exclusive lock on its parent,
|
||
* because another backend might be about to execute a query on the parent
|
||
* table. If it relies on previously cached partition descriptor, then it
|
||
* could attempt to access the just-dropped relation as its partition. We
|
||
* must therefore take a table lock strong enough to prevent all queries
|
||
* on the table from proceeding until we commit and send out a
|
||
* shared-cache-inval notice that will make them update their index lists.
|
||
*/
|
||
tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relid));
|
||
if (!HeapTupleIsValid(tuple))
|
||
elog(ERROR, "cache lookup failed for relation %u", relid);
|
||
if (((Form_pg_class) GETSTRUCT(tuple))->relispartition)
|
||
{
|
||
parentOid = get_partition_parent(relid);
|
||
LockRelationOid(parentOid, AccessExclusiveLock);
|
||
|
||
/*
|
||
* If this is not the default partition, dropping it will change the
|
||
* default partition's partition constraint, so we must lock it.
|
||
*/
|
||
defaultPartOid = get_default_partition_oid(parentOid);
|
||
if (OidIsValid(defaultPartOid) && relid != defaultPartOid)
|
||
LockRelationOid(defaultPartOid, AccessExclusiveLock);
|
||
}
|
||
|
||
ReleaseSysCache(tuple);
|
||
|
||
/*
|
||
* Open and lock the relation.
|
||
*/
|
||
rel = relation_open(relid, AccessExclusiveLock);
|
||
|
||
/*
|
||
* There can no longer be anyone *else* touching the relation, but we
|
||
* might still have open queries or cursors, or pending trigger events, in
|
||
* our own session.
|
||
*/
|
||
CheckTableNotInUse(rel, "DROP TABLE");
|
||
|
||
/*
|
||
* This effectively deletes all rows in the table, and may be done in a
|
||
* serializable transaction. In that case we must record a rw-conflict in
|
||
* to this transaction from each transaction holding a predicate lock on
|
||
* the table.
|
||
*/
|
||
CheckTableForSerializableConflictIn(rel);
|
||
|
||
/*
|
||
* Delete pg_foreign_table tuple first.
|
||
*/
|
||
if (rel->rd_rel->relkind == RELKIND_FOREIGN_TABLE)
|
||
{
|
||
Relation rel;
|
||
HeapTuple tuple;
|
||
|
||
rel = heap_open(ForeignTableRelationId, RowExclusiveLock);
|
||
|
||
tuple = SearchSysCache1(FOREIGNTABLEREL, ObjectIdGetDatum(relid));
|
||
if (!HeapTupleIsValid(tuple))
|
||
elog(ERROR, "cache lookup failed for foreign table %u", relid);
|
||
|
||
CatalogTupleDelete(rel, &tuple->t_self);
|
||
|
||
ReleaseSysCache(tuple);
|
||
heap_close(rel, RowExclusiveLock);
|
||
}
|
||
|
||
/*
|
||
* If a partitioned table, delete the pg_partitioned_table tuple.
|
||
*/
|
||
if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
|
||
RemovePartitionKeyByRelId(relid);
|
||
|
||
/*
|
||
* If the relation being dropped is the default partition itself,
|
||
* invalidate its entry in pg_partitioned_table.
|
||
*/
|
||
if (relid == defaultPartOid)
|
||
update_default_partition_oid(parentOid, InvalidOid);
|
||
|
||
/*
|
||
* Schedule unlinking of the relation's physical files at commit.
|
||
*/
|
||
if (rel->rd_rel->relkind != RELKIND_VIEW &&
|
||
rel->rd_rel->relkind != RELKIND_COMPOSITE_TYPE &&
|
||
rel->rd_rel->relkind != RELKIND_FOREIGN_TABLE &&
|
||
rel->rd_rel->relkind != RELKIND_PARTITIONED_TABLE)
|
||
{
|
||
RelationDropStorage(rel);
|
||
}
|
||
|
||
/*
|
||
* Close relcache entry, but *keep* AccessExclusiveLock on the relation
|
||
* until transaction commit. This ensures no one else will try to do
|
||
* something with the doomed relation.
|
||
*/
|
||
relation_close(rel, NoLock);
|
||
|
||
/*
|
||
* Remove any associated relation synchronization states.
|
||
*/
|
||
RemoveSubscriptionRel(InvalidOid, relid);
|
||
|
||
/*
|
||
* Forget any ON COMMIT action for the rel
|
||
*/
|
||
remove_on_commit_action(relid);
|
||
|
||
/*
|
||
* Flush the relation from the relcache. We want to do this before
|
||
* starting to remove catalog entries, just to be certain that no relcache
|
||
* entry rebuild will happen partway through. (That should not really
|
||
* matter, since we don't do CommandCounterIncrement here, but let's be
|
||
* safe.)
|
||
*/
|
||
RelationForgetRelation(relid);
|
||
|
||
/*
|
||
* remove inheritance information
|
||
*/
|
||
RelationRemoveInheritance(relid);
|
||
|
||
/*
|
||
* delete statistics
|
||
*/
|
||
RemoveStatistics(relid, 0);
|
||
|
||
/*
|
||
* delete attribute tuples
|
||
*/
|
||
DeleteAttributeTuples(relid);
|
||
|
||
/*
|
||
* delete relation tuple
|
||
*/
|
||
DeleteRelationTuple(relid);
|
||
|
||
if (OidIsValid(parentOid))
|
||
{
|
||
/*
|
||
* If this is not the default partition, the partition constraint of
|
||
* the default partition has changed to include the portion of the key
|
||
* space previously covered by the dropped partition.
|
||
*/
|
||
if (OidIsValid(defaultPartOid) && relid != defaultPartOid)
|
||
CacheInvalidateRelcacheByRelid(defaultPartOid);
|
||
|
||
/*
|
||
* Invalidate the parent's relcache so that the partition is no longer
|
||
* included in its partition descriptor.
|
||
*/
|
||
CacheInvalidateRelcacheByRelid(parentOid);
|
||
/* keep the lock */
|
||
}
|
||
}
|
||
|
||
|
||
/*
|
||
* Store a default expression for column attnum of relation rel.
|
||
*
|
||
* Returns the OID of the new pg_attrdef tuple.
|
||
*/
|
||
Oid
|
||
StoreAttrDefault(Relation rel, AttrNumber attnum,
|
||
Node *expr, bool is_internal)
|
||
{
|
||
char *adbin;
|
||
char *adsrc;
|
||
Relation adrel;
|
||
HeapTuple tuple;
|
||
Datum values[4];
|
||
static bool nulls[4] = {false, false, false, false};
|
||
Relation attrrel;
|
||
HeapTuple atttup;
|
||
Form_pg_attribute attStruct;
|
||
Oid attrdefOid;
|
||
ObjectAddress colobject,
|
||
defobject;
|
||
|
||
/*
|
||
* Flatten expression to string form for storage.
|
||
*/
|
||
adbin = nodeToString(expr);
|
||
|
||
/*
|
||
* Also deparse it to form the mostly-obsolete adsrc field.
|
||
*/
|
||
adsrc = deparse_expression(expr,
|
||
deparse_context_for(RelationGetRelationName(rel),
|
||
RelationGetRelid(rel)),
|
||
false, false);
|
||
|
||
/*
|
||
* Make the pg_attrdef entry.
|
||
*/
|
||
values[Anum_pg_attrdef_adrelid - 1] = RelationGetRelid(rel);
|
||
values[Anum_pg_attrdef_adnum - 1] = attnum;
|
||
values[Anum_pg_attrdef_adbin - 1] = CStringGetTextDatum(adbin);
|
||
values[Anum_pg_attrdef_adsrc - 1] = CStringGetTextDatum(adsrc);
|
||
|
||
adrel = heap_open(AttrDefaultRelationId, RowExclusiveLock);
|
||
|
||
tuple = heap_form_tuple(adrel->rd_att, values, nulls);
|
||
attrdefOid = CatalogTupleInsert(adrel, tuple);
|
||
|
||
defobject.classId = AttrDefaultRelationId;
|
||
defobject.objectId = attrdefOid;
|
||
defobject.objectSubId = 0;
|
||
|
||
heap_close(adrel, RowExclusiveLock);
|
||
|
||
/* now can free some of the stuff allocated above */
|
||
pfree(DatumGetPointer(values[Anum_pg_attrdef_adbin - 1]));
|
||
pfree(DatumGetPointer(values[Anum_pg_attrdef_adsrc - 1]));
|
||
heap_freetuple(tuple);
|
||
pfree(adbin);
|
||
pfree(adsrc);
|
||
|
||
/*
|
||
* Update the pg_attribute entry for the column to show that a default
|
||
* exists.
|
||
*/
|
||
attrrel = heap_open(AttributeRelationId, RowExclusiveLock);
|
||
atttup = SearchSysCacheCopy2(ATTNUM,
|
||
ObjectIdGetDatum(RelationGetRelid(rel)),
|
||
Int16GetDatum(attnum));
|
||
if (!HeapTupleIsValid(atttup))
|
||
elog(ERROR, "cache lookup failed for attribute %d of relation %u",
|
||
attnum, RelationGetRelid(rel));
|
||
attStruct = (Form_pg_attribute) GETSTRUCT(atttup);
|
||
if (!attStruct->atthasdef)
|
||
{
|
||
attStruct->atthasdef = true;
|
||
CatalogTupleUpdate(attrrel, &atttup->t_self, atttup);
|
||
}
|
||
heap_close(attrrel, RowExclusiveLock);
|
||
heap_freetuple(atttup);
|
||
|
||
/*
|
||
* Make a dependency so that the pg_attrdef entry goes away if the column
|
||
* (or whole table) is deleted.
|
||
*/
|
||
colobject.classId = RelationRelationId;
|
||
colobject.objectId = RelationGetRelid(rel);
|
||
colobject.objectSubId = attnum;
|
||
|
||
recordDependencyOn(&defobject, &colobject, DEPENDENCY_AUTO);
|
||
|
||
/*
|
||
* Record dependencies on objects used in the expression, too.
|
||
*/
|
||
recordDependencyOnExpr(&defobject, expr, NIL, DEPENDENCY_NORMAL);
|
||
|
||
/*
|
||
* Post creation hook for attribute defaults.
|
||
*
|
||
* XXX. ALTER TABLE ALTER COLUMN SET/DROP DEFAULT is implemented with a
|
||
* couple of deletion/creation of the attribute's default entry, so the
|
||
* callee should check existence of an older version of this entry if it
|
||
* needs to distinguish.
|
||
*/
|
||
InvokeObjectPostCreateHookArg(AttrDefaultRelationId,
|
||
RelationGetRelid(rel), attnum, is_internal);
|
||
|
||
return attrdefOid;
|
||
}
|
||
|
||
/*
|
||
* Store a check-constraint expression for the given relation.
|
||
*
|
||
* Caller is responsible for updating the count of constraints
|
||
* in the pg_class entry for the relation.
|
||
*
|
||
* The OID of the new constraint is returned.
|
||
*/
|
||
static Oid
|
||
StoreRelCheck(Relation rel, const char *ccname, Node *expr,
|
||
bool is_validated, bool is_local, int inhcount,
|
||
bool is_no_inherit, bool is_internal)
|
||
{
|
||
char *ccbin;
|
||
char *ccsrc;
|
||
List *varList;
|
||
int keycount;
|
||
int16 *attNos;
|
||
Oid constrOid;
|
||
|
||
/*
|
||
* Flatten expression to string form for storage.
|
||
*/
|
||
ccbin = nodeToString(expr);
|
||
|
||
/*
|
||
* Also deparse it to form the mostly-obsolete consrc field.
|
||
*/
|
||
ccsrc = deparse_expression(expr,
|
||
deparse_context_for(RelationGetRelationName(rel),
|
||
RelationGetRelid(rel)),
|
||
false, false);
|
||
|
||
/*
|
||
* Find columns of rel that are used in expr
|
||
*
|
||
* NB: pull_var_clause is okay here only because we don't allow subselects
|
||
* in check constraints; it would fail to examine the contents of
|
||
* subselects.
|
||
*/
|
||
varList = pull_var_clause(expr, 0);
|
||
keycount = list_length(varList);
|
||
|
||
if (keycount > 0)
|
||
{
|
||
ListCell *vl;
|
||
int i = 0;
|
||
|
||
attNos = (int16 *) palloc(keycount * sizeof(int16));
|
||
foreach(vl, varList)
|
||
{
|
||
Var *var = (Var *) lfirst(vl);
|
||
int j;
|
||
|
||
for (j = 0; j < i; j++)
|
||
if (attNos[j] == var->varattno)
|
||
break;
|
||
if (j == i)
|
||
attNos[i++] = var->varattno;
|
||
}
|
||
keycount = i;
|
||
}
|
||
else
|
||
attNos = NULL;
|
||
|
||
/*
|
||
* Partitioned tables do not contain any rows themselves, so a NO INHERIT
|
||
* constraint makes no sense.
|
||
*/
|
||
if (is_no_inherit &&
|
||
rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
|
||
ereport(ERROR,
|
||
(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
|
||
errmsg("cannot add NO INHERIT constraint to partitioned table \"%s\"",
|
||
RelationGetRelationName(rel))));
|
||
|
||
/*
|
||
* Create the Check Constraint
|
||
*/
|
||
constrOid =
|
||
CreateConstraintEntry(ccname, /* Constraint Name */
|
||
RelationGetNamespace(rel), /* namespace */
|
||
CONSTRAINT_CHECK, /* Constraint Type */
|
||
false, /* Is Deferrable */
|
||
false, /* Is Deferred */
|
||
is_validated,
|
||
RelationGetRelid(rel), /* relation */
|
||
attNos, /* attrs in the constraint */
|
||
keycount, /* # attrs in the constraint */
|
||
InvalidOid, /* not a domain constraint */
|
||
InvalidOid, /* no associated index */
|
||
InvalidOid, /* Foreign key fields */
|
||
NULL,
|
||
NULL,
|
||
NULL,
|
||
NULL,
|
||
0,
|
||
' ',
|
||
' ',
|
||
' ',
|
||
NULL, /* not an exclusion constraint */
|
||
expr, /* Tree form of check constraint */
|
||
ccbin, /* Binary form of check constraint */
|
||
ccsrc, /* Source form of check constraint */
|
||
is_local, /* conislocal */
|
||
inhcount, /* coninhcount */
|
||
is_no_inherit, /* connoinherit */
|
||
is_internal); /* internally constructed? */
|
||
|
||
pfree(ccbin);
|
||
pfree(ccsrc);
|
||
|
||
return constrOid;
|
||
}
|
||
|
||
/*
|
||
* Store defaults and constraints (passed as a list of CookedConstraint).
|
||
*
|
||
* Each CookedConstraint struct is modified to store the new catalog tuple OID.
|
||
*
|
||
* NOTE: only pre-cooked expressions will be passed this way, which is to
|
||
* say expressions inherited from an existing relation. Newly parsed
|
||
* expressions can be added later, by direct calls to StoreAttrDefault
|
||
* and StoreRelCheck (see AddRelationNewConstraints()).
|
||
*/
|
||
static void
|
||
StoreConstraints(Relation rel, List *cooked_constraints, bool is_internal)
|
||
{
|
||
int numchecks = 0;
|
||
ListCell *lc;
|
||
|
||
if (cooked_constraints == NIL)
|
||
return; /* nothing to do */
|
||
|
||
/*
|
||
* Deparsing of constraint expressions will fail unless the just-created
|
||
* pg_attribute tuples for this relation are made visible. So, bump the
|
||
* command counter. CAUTION: this will cause a relcache entry rebuild.
|
||
*/
|
||
CommandCounterIncrement();
|
||
|
||
foreach(lc, cooked_constraints)
|
||
{
|
||
CookedConstraint *con = (CookedConstraint *) lfirst(lc);
|
||
|
||
switch (con->contype)
|
||
{
|
||
case CONSTR_DEFAULT:
|
||
con->conoid = StoreAttrDefault(rel, con->attnum, con->expr,
|
||
is_internal);
|
||
break;
|
||
case CONSTR_CHECK:
|
||
con->conoid =
|
||
StoreRelCheck(rel, con->name, con->expr,
|
||
!con->skip_validation, con->is_local,
|
||
con->inhcount, con->is_no_inherit,
|
||
is_internal);
|
||
numchecks++;
|
||
break;
|
||
default:
|
||
elog(ERROR, "unrecognized constraint type: %d",
|
||
(int) con->contype);
|
||
}
|
||
}
|
||
|
||
if (numchecks > 0)
|
||
SetRelationNumChecks(rel, numchecks);
|
||
}
|
||
|
||
/*
|
||
* AddRelationNewConstraints
|
||
*
|
||
* Add new column default expressions and/or constraint check expressions
|
||
* to an existing relation. This is defined to do both for efficiency in
|
||
* DefineRelation, but of course you can do just one or the other by passing
|
||
* empty lists.
|
||
*
|
||
* rel: relation to be modified
|
||
* newColDefaults: list of RawColumnDefault structures
|
||
* newConstraints: list of Constraint nodes
|
||
* allow_merge: true if check constraints may be merged with existing ones
|
||
* is_local: true if definition is local, false if it's inherited
|
||
* is_internal: true if result of some internal process, not a user request
|
||
*
|
||
* All entries in newColDefaults will be processed. Entries in newConstraints
|
||
* will be processed only if they are CONSTR_CHECK type.
|
||
*
|
||
* Returns a list of CookedConstraint nodes that shows the cooked form of
|
||
* the default and constraint expressions added to the relation.
|
||
*
|
||
* NB: caller should have opened rel with AccessExclusiveLock, and should
|
||
* hold that lock till end of transaction. Also, we assume the caller has
|
||
* done a CommandCounterIncrement if necessary to make the relation's catalog
|
||
* tuples visible.
|
||
*/
|
||
List *
|
||
AddRelationNewConstraints(Relation rel,
|
||
List *newColDefaults,
|
||
List *newConstraints,
|
||
bool allow_merge,
|
||
bool is_local,
|
||
bool is_internal)
|
||
{
|
||
List *cookedConstraints = NIL;
|
||
TupleDesc tupleDesc;
|
||
TupleConstr *oldconstr;
|
||
int numoldchecks;
|
||
ParseState *pstate;
|
||
RangeTblEntry *rte;
|
||
int numchecks;
|
||
List *checknames;
|
||
ListCell *cell;
|
||
Node *expr;
|
||
CookedConstraint *cooked;
|
||
|
||
/*
|
||
* Get info about existing constraints.
|
||
*/
|
||
tupleDesc = RelationGetDescr(rel);
|
||
oldconstr = tupleDesc->constr;
|
||
if (oldconstr)
|
||
numoldchecks = oldconstr->num_check;
|
||
else
|
||
numoldchecks = 0;
|
||
|
||
/*
|
||
* Create a dummy ParseState and insert the target relation as its sole
|
||
* rangetable entry. We need a ParseState for transformExpr.
|
||
*/
|
||
pstate = make_parsestate(NULL);
|
||
rte = addRangeTableEntryForRelation(pstate,
|
||
rel,
|
||
NULL,
|
||
false,
|
||
true);
|
||
addRTEtoQuery(pstate, rte, true, true, true);
|
||
|
||
/*
|
||
* Process column default expressions.
|
||
*/
|
||
foreach(cell, newColDefaults)
|
||
{
|
||
RawColumnDefault *colDef = (RawColumnDefault *) lfirst(cell);
|
||
Form_pg_attribute atp = TupleDescAttr(rel->rd_att, colDef->attnum - 1);
|
||
Oid defOid;
|
||
|
||
expr = cookDefault(pstate, colDef->raw_default,
|
||
atp->atttypid, atp->atttypmod,
|
||
NameStr(atp->attname));
|
||
|
||
/*
|
||
* If the expression is just a NULL constant, we do not bother to make
|
||
* an explicit pg_attrdef entry, since the default behavior is
|
||
* equivalent.
|
||
*
|
||
* Note a nonobvious property of this test: if the column is of a
|
||
* domain type, what we'll get is not a bare null Const but a
|
||
* CoerceToDomain expr, so we will not discard the default. This is
|
||
* critical because the column default needs to be retained to
|
||
* override any default that the domain might have.
|
||
*/
|
||
if (expr == NULL ||
|
||
(IsA(expr, Const) &&((Const *) expr)->constisnull))
|
||
continue;
|
||
|
||
defOid = StoreAttrDefault(rel, colDef->attnum, expr, is_internal);
|
||
|
||
cooked = (CookedConstraint *) palloc(sizeof(CookedConstraint));
|
||
cooked->contype = CONSTR_DEFAULT;
|
||
cooked->conoid = defOid;
|
||
cooked->name = NULL;
|
||
cooked->attnum = colDef->attnum;
|
||
cooked->expr = expr;
|
||
cooked->skip_validation = false;
|
||
cooked->is_local = is_local;
|
||
cooked->inhcount = is_local ? 0 : 1;
|
||
cooked->is_no_inherit = false;
|
||
cookedConstraints = lappend(cookedConstraints, cooked);
|
||
}
|
||
|
||
/*
|
||
* Process constraint expressions.
|
||
*/
|
||
numchecks = numoldchecks;
|
||
checknames = NIL;
|
||
foreach(cell, newConstraints)
|
||
{
|
||
Constraint *cdef = (Constraint *) lfirst(cell);
|
||
char *ccname;
|
||
Oid constrOid;
|
||
|
||
if (cdef->contype != CONSTR_CHECK)
|
||
continue;
|
||
|
||
if (cdef->raw_expr != NULL)
|
||
{
|
||
Assert(cdef->cooked_expr == NULL);
|
||
|
||
/*
|
||
* Transform raw parsetree to executable expression, and verify
|
||
* it's valid as a CHECK constraint.
|
||
*/
|
||
expr = cookConstraint(pstate, cdef->raw_expr,
|
||
RelationGetRelationName(rel));
|
||
}
|
||
else
|
||
{
|
||
Assert(cdef->cooked_expr != NULL);
|
||
|
||
/*
|
||
* Here, we assume the parser will only pass us valid CHECK
|
||
* expressions, so we do no particular checking.
|
||
*/
|
||
expr = stringToNode(cdef->cooked_expr);
|
||
}
|
||
|
||
/*
|
||
* Check name uniqueness, or generate a name if none was given.
|
||
*/
|
||
if (cdef->conname != NULL)
|
||
{
|
||
ListCell *cell2;
|
||
|
||
ccname = cdef->conname;
|
||
/* Check against other new constraints */
|
||
/* Needed because we don't do CommandCounterIncrement in loop */
|
||
foreach(cell2, checknames)
|
||
{
|
||
if (strcmp((char *) lfirst(cell2), ccname) == 0)
|
||
ereport(ERROR,
|
||
(errcode(ERRCODE_DUPLICATE_OBJECT),
|
||
errmsg("check constraint \"%s\" already exists",
|
||
ccname)));
|
||
}
|
||
|
||
/* save name for future checks */
|
||
checknames = lappend(checknames, ccname);
|
||
|
||
/*
|
||
* Check against pre-existing constraints. If we are allowed to
|
||
* merge with an existing constraint, there's no more to do here.
|
||
* (We omit the duplicate constraint from the result, which is
|
||
* what ATAddCheckConstraint wants.)
|
||
*/
|
||
if (MergeWithExistingConstraint(rel, ccname, expr,
|
||
allow_merge, is_local,
|
||
cdef->initially_valid,
|
||
cdef->is_no_inherit))
|
||
continue;
|
||
}
|
||
else
|
||
{
|
||
/*
|
||
* When generating a name, we want to create "tab_col_check" for a
|
||
* column constraint and "tab_check" for a table constraint. We
|
||
* no longer have any info about the syntactic positioning of the
|
||
* constraint phrase, so we approximate this by seeing whether the
|
||
* expression references more than one column. (If the user
|
||
* played by the rules, the result is the same...)
|
||
*
|
||
* Note: pull_var_clause() doesn't descend into sublinks, but we
|
||
* eliminated those above; and anyway this only needs to be an
|
||
* approximate answer.
|
||
*/
|
||
List *vars;
|
||
char *colname;
|
||
|
||
vars = pull_var_clause(expr, 0);
|
||
|
||
/* eliminate duplicates */
|
||
vars = list_union(NIL, vars);
|
||
|
||
if (list_length(vars) == 1)
|
||
colname = get_attname(RelationGetRelid(rel),
|
||
((Var *) linitial(vars))->varattno);
|
||
else
|
||
colname = NULL;
|
||
|
||
ccname = ChooseConstraintName(RelationGetRelationName(rel),
|
||
colname,
|
||
"check",
|
||
RelationGetNamespace(rel),
|
||
checknames);
|
||
|
||
/* save name for future checks */
|
||
checknames = lappend(checknames, ccname);
|
||
}
|
||
|
||
/*
|
||
* OK, store it.
|
||
*/
|
||
constrOid =
|
||
StoreRelCheck(rel, ccname, expr, cdef->initially_valid, is_local,
|
||
is_local ? 0 : 1, cdef->is_no_inherit, is_internal);
|
||
|
||
numchecks++;
|
||
|
||
cooked = (CookedConstraint *) palloc(sizeof(CookedConstraint));
|
||
cooked->contype = CONSTR_CHECK;
|
||
cooked->conoid = constrOid;
|
||
cooked->name = ccname;
|
||
cooked->attnum = 0;
|
||
cooked->expr = expr;
|
||
cooked->skip_validation = cdef->skip_validation;
|
||
cooked->is_local = is_local;
|
||
cooked->inhcount = is_local ? 0 : 1;
|
||
cooked->is_no_inherit = cdef->is_no_inherit;
|
||
cookedConstraints = lappend(cookedConstraints, cooked);
|
||
}
|
||
|
||
/*
|
||
* Update the count of constraints in the relation's pg_class tuple. We do
|
||
* this even if there was no change, in order to ensure that an SI update
|
||
* message is sent out for the pg_class tuple, which will force other
|
||
* backends to rebuild their relcache entries for the rel. (This is
|
||
* critical if we added defaults but not constraints.)
|
||
*/
|
||
SetRelationNumChecks(rel, numchecks);
|
||
|
||
return cookedConstraints;
|
||
}
|
||
|
||
/*
|
||
* Check for a pre-existing check constraint that conflicts with a proposed
|
||
* new one, and either adjust its conislocal/coninhcount settings or throw
|
||
* error as needed.
|
||
*
|
||
* Returns true if merged (constraint is a duplicate), or false if it's
|
||
* got a so-far-unique name, or throws error if conflict.
|
||
*
|
||
* XXX See MergeConstraintsIntoExisting too if you change this code.
|
||
*/
|
||
static bool
|
||
MergeWithExistingConstraint(Relation rel, const char *ccname, Node *expr,
|
||
bool allow_merge, bool is_local,
|
||
bool is_initially_valid,
|
||
bool is_no_inherit)
|
||
{
|
||
bool found;
|
||
Relation conDesc;
|
||
SysScanDesc conscan;
|
||
ScanKeyData skey[2];
|
||
HeapTuple tup;
|
||
|
||
/* Search for a pg_constraint entry with same name and relation */
|
||
conDesc = heap_open(ConstraintRelationId, RowExclusiveLock);
|
||
|
||
found = false;
|
||
|
||
ScanKeyInit(&skey[0],
|
||
Anum_pg_constraint_conname,
|
||
BTEqualStrategyNumber, F_NAMEEQ,
|
||
CStringGetDatum(ccname));
|
||
|
||
ScanKeyInit(&skey[1],
|
||
Anum_pg_constraint_connamespace,
|
||
BTEqualStrategyNumber, F_OIDEQ,
|
||
ObjectIdGetDatum(RelationGetNamespace(rel)));
|
||
|
||
conscan = systable_beginscan(conDesc, ConstraintNameNspIndexId, true,
|
||
NULL, 2, skey);
|
||
|
||
while (HeapTupleIsValid(tup = systable_getnext(conscan)))
|
||
{
|
||
Form_pg_constraint con = (Form_pg_constraint) GETSTRUCT(tup);
|
||
|
||
if (con->conrelid == RelationGetRelid(rel))
|
||
{
|
||
/* Found it. Conflicts if not identical check constraint */
|
||
if (con->contype == CONSTRAINT_CHECK)
|
||
{
|
||
Datum val;
|
||
bool isnull;
|
||
|
||
val = fastgetattr(tup,
|
||
Anum_pg_constraint_conbin,
|
||
conDesc->rd_att, &isnull);
|
||
if (isnull)
|
||
elog(ERROR, "null conbin for rel %s",
|
||
RelationGetRelationName(rel));
|
||
if (equal(expr, stringToNode(TextDatumGetCString(val))))
|
||
found = true;
|
||
}
|
||
|
||
/*
|
||
* If the existing constraint is purely inherited (no local
|
||
* definition) then interpret addition of a local constraint as a
|
||
* legal merge. This allows ALTER ADD CONSTRAINT on parent and
|
||
* child tables to be given in either order with same end state.
|
||
* However if the relation is a partition, all inherited
|
||
* constraints are always non-local, including those that were
|
||
* merged.
|
||
*/
|
||
if (is_local && !con->conislocal && !rel->rd_rel->relispartition)
|
||
allow_merge = true;
|
||
|
||
if (!found || !allow_merge)
|
||
ereport(ERROR,
|
||
(errcode(ERRCODE_DUPLICATE_OBJECT),
|
||
errmsg("constraint \"%s\" for relation \"%s\" already exists",
|
||
ccname, RelationGetRelationName(rel))));
|
||
|
||
/* If the child constraint is "no inherit" then cannot merge */
|
||
if (con->connoinherit)
|
||
ereport(ERROR,
|
||
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
|
||
errmsg("constraint \"%s\" conflicts with non-inherited constraint on relation \"%s\"",
|
||
ccname, RelationGetRelationName(rel))));
|
||
|
||
/*
|
||
* Must not change an existing inherited constraint to "no
|
||
* inherit" status. That's because inherited constraints should
|
||
* be able to propagate to lower-level children.
|
||
*/
|
||
if (con->coninhcount > 0 && is_no_inherit)
|
||
ereport(ERROR,
|
||
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
|
||
errmsg("constraint \"%s\" conflicts with inherited constraint on relation \"%s\"",
|
||
ccname, RelationGetRelationName(rel))));
|
||
|
||
/*
|
||
* If the child constraint is "not valid" then cannot merge with a
|
||
* valid parent constraint
|
||
*/
|
||
if (is_initially_valid && !con->convalidated)
|
||
ereport(ERROR,
|
||
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
|
||
errmsg("constraint \"%s\" conflicts with NOT VALID constraint on relation \"%s\"",
|
||
ccname, RelationGetRelationName(rel))));
|
||
|
||
/* OK to update the tuple */
|
||
ereport(NOTICE,
|
||
(errmsg("merging constraint \"%s\" with inherited definition",
|
||
ccname)));
|
||
|
||
tup = heap_copytuple(tup);
|
||
con = (Form_pg_constraint) GETSTRUCT(tup);
|
||
|
||
/*
|
||
* In case of partitions, an inherited constraint must be
|
||
* inherited only once since it cannot have multiple parents and
|
||
* it is never considered local.
|
||
*/
|
||
if (rel->rd_rel->relispartition)
|
||
{
|
||
con->coninhcount = 1;
|
||
con->conislocal = false;
|
||
}
|
||
else
|
||
{
|
||
if (is_local)
|
||
con->conislocal = true;
|
||
else
|
||
con->coninhcount++;
|
||
}
|
||
|
||
if (is_no_inherit)
|
||
{
|
||
Assert(is_local);
|
||
con->connoinherit = true;
|
||
}
|
||
CatalogTupleUpdate(conDesc, &tup->t_self, tup);
|
||
break;
|
||
}
|
||
}
|
||
|
||
systable_endscan(conscan);
|
||
heap_close(conDesc, RowExclusiveLock);
|
||
|
||
return found;
|
||
}
|
||
|
||
/*
|
||
* Update the count of constraints in the relation's pg_class tuple.
|
||
*
|
||
* Caller had better hold exclusive lock on the relation.
|
||
*
|
||
* An important side effect is that a SI update message will be sent out for
|
||
* the pg_class tuple, which will force other backends to rebuild their
|
||
* relcache entries for the rel. Also, this backend will rebuild its
|
||
* own relcache entry at the next CommandCounterIncrement.
|
||
*/
|
||
static void
|
||
SetRelationNumChecks(Relation rel, int numchecks)
|
||
{
|
||
Relation relrel;
|
||
HeapTuple reltup;
|
||
Form_pg_class relStruct;
|
||
|
||
relrel = heap_open(RelationRelationId, RowExclusiveLock);
|
||
reltup = SearchSysCacheCopy1(RELOID,
|
||
ObjectIdGetDatum(RelationGetRelid(rel)));
|
||
if (!HeapTupleIsValid(reltup))
|
||
elog(ERROR, "cache lookup failed for relation %u",
|
||
RelationGetRelid(rel));
|
||
relStruct = (Form_pg_class) GETSTRUCT(reltup);
|
||
|
||
if (relStruct->relchecks != numchecks)
|
||
{
|
||
relStruct->relchecks = numchecks;
|
||
|
||
CatalogTupleUpdate(relrel, &reltup->t_self, reltup);
|
||
}
|
||
else
|
||
{
|
||
/* Skip the disk update, but force relcache inval anyway */
|
||
CacheInvalidateRelcache(rel);
|
||
}
|
||
|
||
heap_freetuple(reltup);
|
||
heap_close(relrel, RowExclusiveLock);
|
||
}
|
||
|
||
/*
|
||
* Take a raw default and convert it to a cooked format ready for
|
||
* storage.
|
||
*
|
||
* Parse state should be set up to recognize any vars that might appear
|
||
* in the expression. (Even though we plan to reject vars, it's more
|
||
* user-friendly to give the correct error message than "unknown var".)
|
||
*
|
||
* If atttypid is not InvalidOid, coerce the expression to the specified
|
||
* type (and typmod atttypmod). attname is only needed in this case:
|
||
* it is used in the error message, if any.
|
||
*/
|
||
Node *
|
||
cookDefault(ParseState *pstate,
|
||
Node *raw_default,
|
||
Oid atttypid,
|
||
int32 atttypmod,
|
||
const char *attname)
|
||
{
|
||
Node *expr;
|
||
|
||
Assert(raw_default != NULL);
|
||
|
||
/*
|
||
* Transform raw parsetree to executable expression.
|
||
*/
|
||
expr = transformExpr(pstate, raw_default, EXPR_KIND_COLUMN_DEFAULT);
|
||
|
||
/*
|
||
* Make sure default expr does not refer to any vars (we need this check
|
||
* since the pstate includes the target table).
|
||
*/
|
||
if (contain_var_clause(expr))
|
||
ereport(ERROR,
|
||
(errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
|
||
errmsg("cannot use column references in default expression")));
|
||
|
||
/*
|
||
* transformExpr() should have already rejected subqueries, aggregates,
|
||
* window functions, and SRFs, based on the EXPR_KIND_ for a default
|
||
* expression.
|
||
*/
|
||
|
||
/*
|
||
* Coerce the expression to the correct type and typmod, if given. This
|
||
* should match the parser's processing of non-defaulted expressions ---
|
||
* see transformAssignedExpr().
|
||
*/
|
||
if (OidIsValid(atttypid))
|
||
{
|
||
Oid type_id = exprType(expr);
|
||
|
||
expr = coerce_to_target_type(pstate, expr, type_id,
|
||
atttypid, atttypmod,
|
||
COERCION_ASSIGNMENT,
|
||
COERCE_IMPLICIT_CAST,
|
||
-1);
|
||
if (expr == NULL)
|
||
ereport(ERROR,
|
||
(errcode(ERRCODE_DATATYPE_MISMATCH),
|
||
errmsg("column \"%s\" is of type %s"
|
||
" but default expression is of type %s",
|
||
attname,
|
||
format_type_be(atttypid),
|
||
format_type_be(type_id)),
|
||
errhint("You will need to rewrite or cast the expression.")));
|
||
}
|
||
|
||
/*
|
||
* Finally, take care of collations in the finished expression.
|
||
*/
|
||
assign_expr_collations(pstate, expr);
|
||
|
||
return expr;
|
||
}
|
||
|
||
/*
|
||
* Take a raw CHECK constraint expression and convert it to a cooked format
|
||
* ready for storage.
|
||
*
|
||
* Parse state must be set up to recognize any vars that might appear
|
||
* in the expression.
|
||
*/
|
||
static Node *
|
||
cookConstraint(ParseState *pstate,
|
||
Node *raw_constraint,
|
||
char *relname)
|
||
{
|
||
Node *expr;
|
||
|
||
/*
|
||
* Transform raw parsetree to executable expression.
|
||
*/
|
||
expr = transformExpr(pstate, raw_constraint, EXPR_KIND_CHECK_CONSTRAINT);
|
||
|
||
/*
|
||
* Make sure it yields a boolean result.
|
||
*/
|
||
expr = coerce_to_boolean(pstate, expr, "CHECK");
|
||
|
||
/*
|
||
* Take care of collations.
|
||
*/
|
||
assign_expr_collations(pstate, expr);
|
||
|
||
/*
|
||
* Make sure no outside relations are referred to (this is probably dead
|
||
* code now that add_missing_from is history).
|
||
*/
|
||
if (list_length(pstate->p_rtable) != 1)
|
||
ereport(ERROR,
|
||
(errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
|
||
errmsg("only table \"%s\" can be referenced in check constraint",
|
||
relname)));
|
||
|
||
return expr;
|
||
}
|
||
|
||
|
||
/*
|
||
* RemoveStatistics --- remove entries in pg_statistic for a rel or column
|
||
*
|
||
* If attnum is zero, remove all entries for rel; else remove only the one(s)
|
||
* for that column.
|
||
*/
|
||
void
|
||
RemoveStatistics(Oid relid, AttrNumber attnum)
|
||
{
|
||
Relation pgstatistic;
|
||
SysScanDesc scan;
|
||
ScanKeyData key[2];
|
||
int nkeys;
|
||
HeapTuple tuple;
|
||
|
||
pgstatistic = heap_open(StatisticRelationId, RowExclusiveLock);
|
||
|
||
ScanKeyInit(&key[0],
|
||
Anum_pg_statistic_starelid,
|
||
BTEqualStrategyNumber, F_OIDEQ,
|
||
ObjectIdGetDatum(relid));
|
||
|
||
if (attnum == 0)
|
||
nkeys = 1;
|
||
else
|
||
{
|
||
ScanKeyInit(&key[1],
|
||
Anum_pg_statistic_staattnum,
|
||
BTEqualStrategyNumber, F_INT2EQ,
|
||
Int16GetDatum(attnum));
|
||
nkeys = 2;
|
||
}
|
||
|
||
scan = systable_beginscan(pgstatistic, StatisticRelidAttnumInhIndexId, true,
|
||
NULL, nkeys, key);
|
||
|
||
/* we must loop even when attnum != 0, in case of inherited stats */
|
||
while (HeapTupleIsValid(tuple = systable_getnext(scan)))
|
||
CatalogTupleDelete(pgstatistic, &tuple->t_self);
|
||
|
||
systable_endscan(scan);
|
||
|
||
heap_close(pgstatistic, RowExclusiveLock);
|
||
}
|
||
|
||
|
||
/*
|
||
* RelationTruncateIndexes - truncate all indexes associated
|
||
* with the heap relation to zero tuples.
|
||
*
|
||
* The routine will truncate and then reconstruct the indexes on
|
||
* the specified relation. Caller must hold exclusive lock on rel.
|
||
*/
|
||
static void
|
||
RelationTruncateIndexes(Relation heapRelation)
|
||
{
|
||
ListCell *indlist;
|
||
|
||
/* Ask the relcache to produce a list of the indexes of the rel */
|
||
foreach(indlist, RelationGetIndexList(heapRelation))
|
||
{
|
||
Oid indexId = lfirst_oid(indlist);
|
||
Relation currentIndex;
|
||
IndexInfo *indexInfo;
|
||
|
||
/* Open the index relation; use exclusive lock, just to be sure */
|
||
currentIndex = index_open(indexId, AccessExclusiveLock);
|
||
|
||
/* Fetch info needed for index_build */
|
||
indexInfo = BuildIndexInfo(currentIndex);
|
||
|
||
/*
|
||
* Now truncate the actual file (and discard buffers).
|
||
*/
|
||
RelationTruncate(currentIndex, 0);
|
||
|
||
/* Initialize the index and rebuild */
|
||
/* Note: we do not need to re-establish pkey setting */
|
||
index_build(heapRelation, currentIndex, indexInfo, false, true);
|
||
|
||
/* We're done with this index */
|
||
index_close(currentIndex, NoLock);
|
||
}
|
||
}
|
||
|
||
/*
|
||
* heap_truncate
|
||
*
|
||
* This routine deletes all data within all the specified relations.
|
||
*
|
||
* This is not transaction-safe! There is another, transaction-safe
|
||
* implementation in commands/tablecmds.c. We now use this only for
|
||
* ON COMMIT truncation of temporary tables, where it doesn't matter.
|
||
*/
|
||
void
|
||
heap_truncate(List *relids)
|
||
{
|
||
List *relations = NIL;
|
||
ListCell *cell;
|
||
|
||
/* Open relations for processing, and grab exclusive access on each */
|
||
foreach(cell, relids)
|
||
{
|
||
Oid rid = lfirst_oid(cell);
|
||
Relation rel;
|
||
|
||
rel = heap_open(rid, AccessExclusiveLock);
|
||
relations = lappend(relations, rel);
|
||
}
|
||
|
||
/* Don't allow truncate on tables that are referenced by foreign keys */
|
||
heap_truncate_check_FKs(relations, true);
|
||
|
||
/* OK to do it */
|
||
foreach(cell, relations)
|
||
{
|
||
Relation rel = lfirst(cell);
|
||
|
||
/* Truncate the relation */
|
||
heap_truncate_one_rel(rel);
|
||
|
||
/* Close the relation, but keep exclusive lock on it until commit */
|
||
heap_close(rel, NoLock);
|
||
}
|
||
}
|
||
|
||
/*
|
||
* heap_truncate_one_rel
|
||
*
|
||
* This routine deletes all data within the specified relation.
|
||
*
|
||
* This is not transaction-safe, because the truncation is done immediately
|
||
* and cannot be rolled back later. Caller is responsible for having
|
||
* checked permissions etc, and must have obtained AccessExclusiveLock.
|
||
*/
|
||
void
|
||
heap_truncate_one_rel(Relation rel)
|
||
{
|
||
Oid toastrelid;
|
||
|
||
/* Truncate the actual file (and discard buffers) */
|
||
RelationTruncate(rel, 0);
|
||
|
||
/* If the relation has indexes, truncate the indexes too */
|
||
RelationTruncateIndexes(rel);
|
||
|
||
/* If there is a toast table, truncate that too */
|
||
toastrelid = rel->rd_rel->reltoastrelid;
|
||
if (OidIsValid(toastrelid))
|
||
{
|
||
Relation toastrel = heap_open(toastrelid, AccessExclusiveLock);
|
||
|
||
RelationTruncate(toastrel, 0);
|
||
RelationTruncateIndexes(toastrel);
|
||
/* keep the lock... */
|
||
heap_close(toastrel, NoLock);
|
||
}
|
||
}
|
||
|
||
/*
|
||
* heap_truncate_check_FKs
|
||
* Check for foreign keys referencing a list of relations that
|
||
* are to be truncated, and raise error if there are any
|
||
*
|
||
* We disallow such FKs (except self-referential ones) since the whole point
|
||
* of TRUNCATE is to not scan the individual rows to be thrown away.
|
||
*
|
||
* This is split out so it can be shared by both implementations of truncate.
|
||
* Caller should already hold a suitable lock on the relations.
|
||
*
|
||
* tempTables is only used to select an appropriate error message.
|
||
*/
|
||
void
|
||
heap_truncate_check_FKs(List *relations, bool tempTables)
|
||
{
|
||
List *oids = NIL;
|
||
List *dependents;
|
||
ListCell *cell;
|
||
|
||
/*
|
||
* Build a list of OIDs of the interesting relations.
|
||
*
|
||
* If a relation has no triggers, then it can neither have FKs nor be
|
||
* referenced by a FK from another table, so we can ignore it.
|
||
*/
|
||
foreach(cell, relations)
|
||
{
|
||
Relation rel = lfirst(cell);
|
||
|
||
if (rel->rd_rel->relhastriggers)
|
||
oids = lappend_oid(oids, RelationGetRelid(rel));
|
||
}
|
||
|
||
/*
|
||
* Fast path: if no relation has triggers, none has FKs either.
|
||
*/
|
||
if (oids == NIL)
|
||
return;
|
||
|
||
/*
|
||
* Otherwise, must scan pg_constraint. We make one pass with all the
|
||
* relations considered; if this finds nothing, then all is well.
|
||
*/
|
||
dependents = heap_truncate_find_FKs(oids);
|
||
if (dependents == NIL)
|
||
return;
|
||
|
||
/*
|
||
* Otherwise we repeat the scan once per relation to identify a particular
|
||
* pair of relations to complain about. This is pretty slow, but
|
||
* performance shouldn't matter much in a failure path. The reason for
|
||
* doing things this way is to ensure that the message produced is not
|
||
* dependent on chance row locations within pg_constraint.
|
||
*/
|
||
foreach(cell, oids)
|
||
{
|
||
Oid relid = lfirst_oid(cell);
|
||
ListCell *cell2;
|
||
|
||
dependents = heap_truncate_find_FKs(list_make1_oid(relid));
|
||
|
||
foreach(cell2, dependents)
|
||
{
|
||
Oid relid2 = lfirst_oid(cell2);
|
||
|
||
if (!list_member_oid(oids, relid2))
|
||
{
|
||
char *relname = get_rel_name(relid);
|
||
char *relname2 = get_rel_name(relid2);
|
||
|
||
if (tempTables)
|
||
ereport(ERROR,
|
||
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
|
||
errmsg("unsupported ON COMMIT and foreign key combination"),
|
||
errdetail("Table \"%s\" references \"%s\", but they do not have the same ON COMMIT setting.",
|
||
relname2, relname)));
|
||
else
|
||
ereport(ERROR,
|
||
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
|
||
errmsg("cannot truncate a table referenced in a foreign key constraint"),
|
||
errdetail("Table \"%s\" references \"%s\".",
|
||
relname2, relname),
|
||
errhint("Truncate table \"%s\" at the same time, "
|
||
"or use TRUNCATE ... CASCADE.",
|
||
relname2)));
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
/*
|
||
* heap_truncate_find_FKs
|
||
* Find relations having foreign keys referencing any of the given rels
|
||
*
|
||
* Input and result are both lists of relation OIDs. The result contains
|
||
* no duplicates, does *not* include any rels that were already in the input
|
||
* list, and is sorted in OID order. (The last property is enforced mainly
|
||
* to guarantee consistent behavior in the regression tests; we don't want
|
||
* behavior to change depending on chance locations of rows in pg_constraint.)
|
||
*
|
||
* Note: caller should already have appropriate lock on all rels mentioned
|
||
* in relationIds. Since adding or dropping an FK requires exclusive lock
|
||
* on both rels, this ensures that the answer will be stable.
|
||
*/
|
||
List *
|
||
heap_truncate_find_FKs(List *relationIds)
|
||
{
|
||
List *result = NIL;
|
||
Relation fkeyRel;
|
||
SysScanDesc fkeyScan;
|
||
HeapTuple tuple;
|
||
|
||
/*
|
||
* Must scan pg_constraint. Right now, it is a seqscan because there is
|
||
* no available index on confrelid.
|
||
*/
|
||
fkeyRel = heap_open(ConstraintRelationId, AccessShareLock);
|
||
|
||
fkeyScan = systable_beginscan(fkeyRel, InvalidOid, false,
|
||
NULL, 0, NULL);
|
||
|
||
while (HeapTupleIsValid(tuple = systable_getnext(fkeyScan)))
|
||
{
|
||
Form_pg_constraint con = (Form_pg_constraint) GETSTRUCT(tuple);
|
||
|
||
/* Not a foreign key */
|
||
if (con->contype != CONSTRAINT_FOREIGN)
|
||
continue;
|
||
|
||
/* Not referencing one of our list of tables */
|
||
if (!list_member_oid(relationIds, con->confrelid))
|
||
continue;
|
||
|
||
/* Add referencer unless already in input or result list */
|
||
if (!list_member_oid(relationIds, con->conrelid))
|
||
result = insert_ordered_unique_oid(result, con->conrelid);
|
||
}
|
||
|
||
systable_endscan(fkeyScan);
|
||
heap_close(fkeyRel, AccessShareLock);
|
||
|
||
return result;
|
||
}
|
||
|
||
/*
|
||
* insert_ordered_unique_oid
|
||
* Insert a new Oid into a sorted list of Oids, preserving ordering,
|
||
* and eliminating duplicates
|
||
*
|
||
* Building the ordered list this way is O(N^2), but with a pretty small
|
||
* constant, so for the number of entries we expect it will probably be
|
||
* faster than trying to apply qsort(). It seems unlikely someone would be
|
||
* trying to truncate a table with thousands of dependent tables ...
|
||
*/
|
||
static List *
|
||
insert_ordered_unique_oid(List *list, Oid datum)
|
||
{
|
||
ListCell *prev;
|
||
|
||
/* Does the datum belong at the front? */
|
||
if (list == NIL || datum < linitial_oid(list))
|
||
return lcons_oid(datum, list);
|
||
/* Does it match the first entry? */
|
||
if (datum == linitial_oid(list))
|
||
return list; /* duplicate, so don't insert */
|
||
/* No, so find the entry it belongs after */
|
||
prev = list_head(list);
|
||
for (;;)
|
||
{
|
||
ListCell *curr = lnext(prev);
|
||
|
||
if (curr == NULL || datum < lfirst_oid(curr))
|
||
break; /* it belongs after 'prev', before 'curr' */
|
||
|
||
if (datum == lfirst_oid(curr))
|
||
return list; /* duplicate, so don't insert */
|
||
|
||
prev = curr;
|
||
}
|
||
/* Insert datum into list after 'prev' */
|
||
lappend_cell_oid(list, prev, datum);
|
||
return list;
|
||
}
|
||
|
||
/*
|
||
* StorePartitionKey
|
||
* Store information about the partition key rel into the catalog
|
||
*/
|
||
void
|
||
StorePartitionKey(Relation rel,
|
||
char strategy,
|
||
int16 partnatts,
|
||
AttrNumber *partattrs,
|
||
List *partexprs,
|
||
Oid *partopclass,
|
||
Oid *partcollation)
|
||
{
|
||
int i;
|
||
int2vector *partattrs_vec;
|
||
oidvector *partopclass_vec;
|
||
oidvector *partcollation_vec;
|
||
Datum partexprDatum;
|
||
Relation pg_partitioned_table;
|
||
HeapTuple tuple;
|
||
Datum values[Natts_pg_partitioned_table];
|
||
bool nulls[Natts_pg_partitioned_table];
|
||
ObjectAddress myself;
|
||
ObjectAddress referenced;
|
||
|
||
Assert(rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE);
|
||
|
||
/* Copy the partition attribute numbers, opclass OIDs into arrays */
|
||
partattrs_vec = buildint2vector(partattrs, partnatts);
|
||
partopclass_vec = buildoidvector(partopclass, partnatts);
|
||
partcollation_vec = buildoidvector(partcollation, partnatts);
|
||
|
||
/* Convert the expressions (if any) to a text datum */
|
||
if (partexprs)
|
||
{
|
||
char *exprString;
|
||
|
||
exprString = nodeToString(partexprs);
|
||
partexprDatum = CStringGetTextDatum(exprString);
|
||
pfree(exprString);
|
||
}
|
||
else
|
||
partexprDatum = (Datum) 0;
|
||
|
||
pg_partitioned_table = heap_open(PartitionedRelationId, RowExclusiveLock);
|
||
|
||
MemSet(nulls, false, sizeof(nulls));
|
||
|
||
/* Only this can ever be NULL */
|
||
if (!partexprDatum)
|
||
nulls[Anum_pg_partitioned_table_partexprs - 1] = true;
|
||
|
||
values[Anum_pg_partitioned_table_partrelid - 1] = ObjectIdGetDatum(RelationGetRelid(rel));
|
||
values[Anum_pg_partitioned_table_partstrat - 1] = CharGetDatum(strategy);
|
||
values[Anum_pg_partitioned_table_partnatts - 1] = Int16GetDatum(partnatts);
|
||
values[Anum_pg_partitioned_table_partdefid - 1] = ObjectIdGetDatum(InvalidOid);
|
||
values[Anum_pg_partitioned_table_partattrs - 1] = PointerGetDatum(partattrs_vec);
|
||
values[Anum_pg_partitioned_table_partclass - 1] = PointerGetDatum(partopclass_vec);
|
||
values[Anum_pg_partitioned_table_partcollation - 1] = PointerGetDatum(partcollation_vec);
|
||
values[Anum_pg_partitioned_table_partexprs - 1] = partexprDatum;
|
||
|
||
tuple = heap_form_tuple(RelationGetDescr(pg_partitioned_table), values, nulls);
|
||
|
||
CatalogTupleInsert(pg_partitioned_table, tuple);
|
||
heap_close(pg_partitioned_table, RowExclusiveLock);
|
||
|
||
/* Mark this relation as dependent on a few things as follows */
|
||
myself.classId = RelationRelationId;
|
||
myself.objectId = RelationGetRelid(rel);;
|
||
myself.objectSubId = 0;
|
||
|
||
/* Operator class and collation per key column */
|
||
for (i = 0; i < partnatts; i++)
|
||
{
|
||
referenced.classId = OperatorClassRelationId;
|
||
referenced.objectId = partopclass[i];
|
||
referenced.objectSubId = 0;
|
||
|
||
recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
|
||
|
||
/* The default collation is pinned, so don't bother recording it */
|
||
if (OidIsValid(partcollation[i]) &&
|
||
partcollation[i] != DEFAULT_COLLATION_OID)
|
||
{
|
||
referenced.classId = CollationRelationId;
|
||
referenced.objectId = partcollation[i];
|
||
referenced.objectSubId = 0;
|
||
}
|
||
|
||
recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
|
||
}
|
||
|
||
/*
|
||
* Anything mentioned in the expressions. We must ignore the column
|
||
* references, which will depend on the table itself; there is no separate
|
||
* partition key object.
|
||
*/
|
||
if (partexprs)
|
||
recordDependencyOnSingleRelExpr(&myself,
|
||
(Node *) partexprs,
|
||
RelationGetRelid(rel),
|
||
DEPENDENCY_NORMAL,
|
||
DEPENDENCY_AUTO, true);
|
||
|
||
/*
|
||
* We must invalidate the relcache so that the next
|
||
* CommandCounterIncrement() will cause the same to be rebuilt using the
|
||
* information in just created catalog entry.
|
||
*/
|
||
CacheInvalidateRelcache(rel);
|
||
}
|
||
|
||
/*
|
||
* RemovePartitionKeyByRelId
|
||
* Remove pg_partitioned_table entry for a relation
|
||
*/
|
||
void
|
||
RemovePartitionKeyByRelId(Oid relid)
|
||
{
|
||
Relation rel;
|
||
HeapTuple tuple;
|
||
|
||
rel = heap_open(PartitionedRelationId, RowExclusiveLock);
|
||
|
||
tuple = SearchSysCache1(PARTRELID, ObjectIdGetDatum(relid));
|
||
if (!HeapTupleIsValid(tuple))
|
||
elog(ERROR, "cache lookup failed for partition key of relation %u",
|
||
relid);
|
||
|
||
CatalogTupleDelete(rel, &tuple->t_self);
|
||
|
||
ReleaseSysCache(tuple);
|
||
heap_close(rel, RowExclusiveLock);
|
||
}
|
||
|
||
/*
|
||
* StorePartitionBound
|
||
* Update pg_class tuple of rel to store the partition bound and set
|
||
* relispartition to true
|
||
*
|
||
* Also, invalidate the parent's relcache, so that the next rebuild will load
|
||
* the new partition's info into its partition descriptor. If there is a
|
||
* default partition, we must invalidate its relcache entry as well.
|
||
*/
|
||
void
|
||
StorePartitionBound(Relation rel, Relation parent, PartitionBoundSpec *bound)
|
||
{
|
||
Relation classRel;
|
||
HeapTuple tuple,
|
||
newtuple;
|
||
Datum new_val[Natts_pg_class];
|
||
bool new_null[Natts_pg_class],
|
||
new_repl[Natts_pg_class];
|
||
Oid defaultPartOid;
|
||
|
||
/* Update pg_class tuple */
|
||
classRel = heap_open(RelationRelationId, RowExclusiveLock);
|
||
tuple = SearchSysCacheCopy1(RELOID,
|
||
ObjectIdGetDatum(RelationGetRelid(rel)));
|
||
if (!HeapTupleIsValid(tuple))
|
||
elog(ERROR, "cache lookup failed for relation %u",
|
||
RelationGetRelid(rel));
|
||
|
||
#ifdef USE_ASSERT_CHECKING
|
||
{
|
||
Form_pg_class classForm;
|
||
bool isnull;
|
||
|
||
classForm = (Form_pg_class) GETSTRUCT(tuple);
|
||
Assert(!classForm->relispartition);
|
||
(void) SysCacheGetAttr(RELOID, tuple, Anum_pg_class_relpartbound,
|
||
&isnull);
|
||
Assert(isnull);
|
||
}
|
||
#endif
|
||
|
||
/* Fill in relpartbound value */
|
||
memset(new_val, 0, sizeof(new_val));
|
||
memset(new_null, false, sizeof(new_null));
|
||
memset(new_repl, false, sizeof(new_repl));
|
||
new_val[Anum_pg_class_relpartbound - 1] = CStringGetTextDatum(nodeToString(bound));
|
||
new_null[Anum_pg_class_relpartbound - 1] = false;
|
||
new_repl[Anum_pg_class_relpartbound - 1] = true;
|
||
newtuple = heap_modify_tuple(tuple, RelationGetDescr(classRel),
|
||
new_val, new_null, new_repl);
|
||
/* Also set the flag */
|
||
((Form_pg_class) GETSTRUCT(newtuple))->relispartition = true;
|
||
CatalogTupleUpdate(classRel, &newtuple->t_self, newtuple);
|
||
heap_freetuple(newtuple);
|
||
heap_close(classRel, RowExclusiveLock);
|
||
|
||
/*
|
||
* The partition constraint for the default partition depends on the
|
||
* partition bounds of every other partition, so we must invalidate the
|
||
* relcache entry for that partition every time a partition is added or
|
||
* removed.
|
||
*/
|
||
defaultPartOid = get_default_oid_from_partdesc(RelationGetPartitionDesc(parent));
|
||
if (OidIsValid(defaultPartOid))
|
||
CacheInvalidateRelcacheByRelid(defaultPartOid);
|
||
|
||
CacheInvalidateRelcache(parent);
|
||
}
|