mirror of
https://git.postgresql.org/git/postgresql.git
synced 2024-10-01 13:31:16 +02:00
1715 lines
42 KiB
C
1715 lines
42 KiB
C
/*-------------------------------------------------------------------------
|
|
*
|
|
* heap.c--
|
|
* code to create and destroy POSTGRES heap relations
|
|
*
|
|
* Copyright (c) 1994, Regents of the University of California
|
|
*
|
|
*
|
|
* IDENTIFICATION
|
|
* $Header: /cvsroot/pgsql/src/backend/catalog/heap.c,v 1.33 1997/11/24 05:08:07 momjian Exp $
|
|
*
|
|
* INTERFACE ROUTINES
|
|
* heap_creatr() - Create an uncataloged heap relation
|
|
* heap_create() - Create a cataloged relation
|
|
* heap_destroy() - Removes named relation from catalogs
|
|
*
|
|
* NOTES
|
|
* this code taken from access/heap/create.c, which contains
|
|
* the old heap_creater, 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 <miscadmin.h>
|
|
#include <fmgr.h>
|
|
#include <access/heapam.h>
|
|
#include <catalog/catalog.h>
|
|
#include <catalog/catname.h>
|
|
#include <catalog/heap.h>
|
|
#include <catalog/index.h>
|
|
#include <catalog/indexing.h>
|
|
#include <catalog/pg_ipl.h>
|
|
#include <catalog/pg_inherits.h>
|
|
#include <catalog/pg_proc.h>
|
|
#include <catalog/pg_index.h>
|
|
#include <catalog/pg_type.h>
|
|
#include <catalog/pg_attrdef.h>
|
|
#include <catalog/pg_relcheck.h>
|
|
#include <commands/trigger.h>
|
|
#include <storage/bufmgr.h>
|
|
#include <storage/lmgr.h>
|
|
#include <storage/smgr.h>
|
|
#include <parser/catalog_utils.h>
|
|
#include <parser/parse_query.h>
|
|
#include <rewrite/rewriteRemove.h>
|
|
#include <utils/builtins.h>
|
|
#include <utils/mcxt.h>
|
|
#include <utils/relcache.h>
|
|
#include <utils/tqual.h>
|
|
#include <nodes/plannodes.h>
|
|
#ifndef HAVE_MEMMOVE
|
|
#include <regex/utils.h>
|
|
#else
|
|
#include <string.h>
|
|
#endif
|
|
|
|
static void AddPgRelationTuple(Relation pg_class_desc,
|
|
Relation new_rel_desc, Oid new_rel_oid, unsigned natts);
|
|
static void AddToTempRelList(Relation r);
|
|
static void DeletePgAttributeTuples(Relation rdesc);
|
|
static void DeletePgRelationTuple(Relation rdesc);
|
|
static void DeletePgTypeTuple(Relation rdesc);
|
|
static int RelationAlreadyExists(Relation pg_class_desc, char relname[]);
|
|
static void RelationRemoveIndexes(Relation relation);
|
|
static void RelationRemoveInheritance(Relation relation);
|
|
static void RemoveFromTempRelList(Relation r);
|
|
static void addNewRelationType(char *typeName, Oid new_rel_oid);
|
|
static void StoreConstraints(Relation rel);
|
|
static void RemoveConstraints(Relation rel);
|
|
|
|
|
|
/* ----------------------------------------------------------------
|
|
* 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 executor special case these attributes in the future?
|
|
* Advantage: consume 1/2 the space in the ATTRIBUTE relation.
|
|
* Disadvantage: having rules to compute values in these tuples may
|
|
* be more difficult if not impossible.
|
|
*/
|
|
|
|
static FormData_pg_attribute a1 = {
|
|
0xffffffff, {"ctid"}, 27l, 0l, sizeof(ItemPointerData),
|
|
SelfItemPointerAttributeNumber, 0, -1, '\0', '\0', 'i', '\0', '\0'
|
|
};
|
|
|
|
static FormData_pg_attribute a2 = {
|
|
0xffffffff, {"oid"}, 26l, 0l, sizeof(Oid),
|
|
ObjectIdAttributeNumber, 0, -1, '\001', '\0', 'i', '\0', '\0'
|
|
};
|
|
|
|
static FormData_pg_attribute a3 = {
|
|
0xffffffff, {"xmin"}, 28l, 0l, sizeof(TransactionId),
|
|
MinTransactionIdAttributeNumber, 0, -1, '\0', '\0', 'i', '\0', '\0'
|
|
};
|
|
|
|
static FormData_pg_attribute a4 = {
|
|
0xffffffff, {"cmin"}, 29l, 0l, sizeof(CommandId),
|
|
MinCommandIdAttributeNumber, 0, -1, '\001', '\0', 'i', '\0', '\0'
|
|
};
|
|
|
|
static FormData_pg_attribute a5 = {
|
|
0xffffffff, {"xmax"}, 28l, 0l, sizeof(TransactionId),
|
|
MaxTransactionIdAttributeNumber, 0, -1, '\0', '\0', 'i', '\0', '\0'
|
|
};
|
|
|
|
static FormData_pg_attribute a6 = {
|
|
0xffffffff, {"cmax"}, 29l, 0l, sizeof(CommandId),
|
|
MaxCommandIdAttributeNumber, 0, -1, '\001', '\0', 'i', '\0', '\0'
|
|
};
|
|
|
|
static AttributeTupleForm HeapAtt[] =
|
|
{&a1, &a2, &a3, &a4, &a5, &a6};
|
|
|
|
/* ----------------------------------------------------------------
|
|
* XXX END OF UGLY HARD CODED BADNESS XXX
|
|
* ----------------------------------------------------------------
|
|
*/
|
|
|
|
/* the tempRelList holds
|
|
the list of temporary uncatalogued relations that are created.
|
|
these relations should be destroyed at the end of transactions
|
|
*/
|
|
typedef struct tempRelList
|
|
{
|
|
Relation *rels; /* array of relation descriptors */
|
|
int num; /* number of temporary relations */
|
|
int size; /* size of space allocated for the rels
|
|
* array */
|
|
} TempRelList;
|
|
|
|
#define TEMP_REL_LIST_SIZE 32
|
|
|
|
static TempRelList *tempRels = NULL;
|
|
|
|
|
|
/* ----------------------------------------------------------------
|
|
* heap_creatr - Create an uncataloged heap relation
|
|
*
|
|
* Fields relpages, reltuples, reltuples, relkeys, relhistory,
|
|
* relisindexed, and relkind of rdesc->rd_rel are initialized
|
|
* to all zeros, as are rd_last and rd_hook. Rd_refcnt is set to 1.
|
|
*
|
|
* Remove the system relation specific code to elsewhere eventually.
|
|
*
|
|
* Eventually, must place information about this temporary relation
|
|
* into the transaction context block.
|
|
*
|
|
*
|
|
* if heap_creatr is called with "" as the name, then heap_creatr will create a
|
|
* temporary name "temp_$RELOID" for the relation
|
|
* ----------------------------------------------------------------
|
|
*/
|
|
Relation
|
|
heap_creatr(char *name,
|
|
TupleDesc tupDesc)
|
|
{
|
|
register unsigned i;
|
|
Oid relid;
|
|
Relation rdesc;
|
|
int len;
|
|
bool nailme = false;
|
|
char *relname = name;
|
|
char tempname[40];
|
|
int isTemp = 0;
|
|
int natts = tupDesc->natts;
|
|
|
|
/* AttributeTupleForm *att = tupDesc->attrs; */
|
|
|
|
extern GlobalMemory CacheCxt;
|
|
MemoryContext oldcxt;
|
|
|
|
/* ----------------
|
|
* sanity checks
|
|
* ----------------
|
|
*/
|
|
AssertArg(natts > 0);
|
|
|
|
if (IsSystemRelationName(relname) && IsNormalProcessingMode())
|
|
{
|
|
elog(WARN,
|
|
"Illegal class name: %s -- pg_ is reserved for system catalogs",
|
|
relname);
|
|
}
|
|
|
|
/* ----------------
|
|
* switch to the cache context so that we don't lose
|
|
* allocations at the end of this transaction, I guess.
|
|
* -cim 6/14/90
|
|
* ----------------
|
|
*/
|
|
if (!CacheCxt)
|
|
CacheCxt = CreateGlobalMemory("Cache");
|
|
|
|
oldcxt = MemoryContextSwitchTo((MemoryContext) CacheCxt);
|
|
|
|
/* ----------------
|
|
* real ugly stuff to assign the proper relid in the relation
|
|
* descriptor follows.
|
|
* ----------------
|
|
*/
|
|
if (!strcmp(RelationRelationName, relname))
|
|
{
|
|
relid = RelOid_pg_class;
|
|
nailme = true;
|
|
}
|
|
else if (!strcmp(AttributeRelationName, relname))
|
|
{
|
|
relid = RelOid_pg_attribute;
|
|
nailme = true;
|
|
}
|
|
else if (!strcmp(ProcedureRelationName, relname))
|
|
{
|
|
relid = RelOid_pg_proc;
|
|
nailme = true;
|
|
}
|
|
else if (!strcmp(TypeRelationName, relname))
|
|
{
|
|
relid = RelOid_pg_type;
|
|
nailme = true;
|
|
}
|
|
else
|
|
{
|
|
relid = newoid();
|
|
|
|
if (name[0] == '\0')
|
|
{
|
|
sprintf(tempname, "temp_%d", relid);
|
|
relname = tempname;
|
|
isTemp = 1;
|
|
}
|
|
}
|
|
|
|
/* ----------------
|
|
* allocate a new relation descriptor.
|
|
*
|
|
* XXX the length computation may be incorrect, handle elsewhere
|
|
* ----------------
|
|
*/
|
|
len = sizeof(RelationData);
|
|
|
|
rdesc = (Relation) palloc(len);
|
|
MemSet((char *) rdesc, 0, len);
|
|
|
|
/* ----------
|
|
create a new tuple descriptor from the one passed in
|
|
*/
|
|
rdesc->rd_att = CreateTupleDescCopyConstr(tupDesc);
|
|
|
|
/* ----------------
|
|
* initialize the fields of our new relation descriptor
|
|
* ----------------
|
|
*/
|
|
|
|
/* ----------------
|
|
* nail the reldesc if this is a bootstrap create reln and
|
|
* we may need it in the cache later on in the bootstrap
|
|
* process so we don't ever want it kicked out. e.g. pg_attribute!!!
|
|
* ----------------
|
|
*/
|
|
if (nailme)
|
|
rdesc->rd_isnailed = true;
|
|
|
|
RelationSetReferenceCount(rdesc, 1);
|
|
|
|
rdesc->rd_rel = (Form_pg_class) palloc(sizeof *rdesc->rd_rel);
|
|
|
|
MemSet((char *) rdesc->rd_rel, 0,
|
|
sizeof *rdesc->rd_rel);
|
|
namestrcpy(&(rdesc->rd_rel->relname), relname);
|
|
rdesc->rd_rel->relkind = RELKIND_UNCATALOGED;
|
|
rdesc->rd_rel->relnatts = natts;
|
|
if (tupDesc->constr)
|
|
rdesc->rd_rel->relchecks = tupDesc->constr->num_check;
|
|
|
|
for (i = 0; i < natts; i++)
|
|
{
|
|
rdesc->rd_att->attrs[i]->attrelid = relid;
|
|
}
|
|
|
|
rdesc->rd_id = relid;
|
|
|
|
if (nailme)
|
|
{
|
|
/* for system relations, set the reltype field here */
|
|
rdesc->rd_rel->reltype = relid;
|
|
}
|
|
|
|
/* ----------------
|
|
* remember if this is a temp relation
|
|
* ----------------
|
|
*/
|
|
|
|
rdesc->rd_istemp = isTemp;
|
|
|
|
/* ----------------
|
|
* have the storage manager create the relation.
|
|
* ----------------
|
|
*/
|
|
|
|
rdesc->rd_tmpunlinked = TRUE; /* change once table is created */
|
|
rdesc->rd_fd = (File) smgrcreate(DEFAULT_SMGR, rdesc);
|
|
rdesc->rd_tmpunlinked = FALSE;
|
|
|
|
RelationRegisterRelation(rdesc);
|
|
|
|
MemoryContextSwitchTo(oldcxt);
|
|
|
|
/*
|
|
* add all temporary relations to the tempRels list so they can be
|
|
* properly disposed of at the end of transaction
|
|
*/
|
|
if (isTemp)
|
|
AddToTempRelList(rdesc);
|
|
|
|
return (rdesc);
|
|
}
|
|
|
|
|
|
/* ----------------------------------------------------------------
|
|
* heap_create - Create a cataloged relation
|
|
*
|
|
* this is done in 6 steps:
|
|
*
|
|
* 1) CheckAttributeNames() is used to make certain the tuple
|
|
* descriptor contains a valid set of attribute names
|
|
*
|
|
* 2) pg_class is opened and RelationAlreadyExists()
|
|
* preforms a scan to ensure that no relation with the
|
|
* same name already exists.
|
|
*
|
|
* 3) heap_creater() is called to create the new relation on
|
|
* disk.
|
|
*
|
|
* 4) TypeDefine() is called to define a new type corresponding
|
|
* to the new relation.
|
|
*
|
|
* 5) AddNewAttributeTuples() is called to register the
|
|
* new relation's schema in pg_attribute.
|
|
*
|
|
* 6) AddPgRelationTuple() is called to register the
|
|
* relation itself in the catalogs.
|
|
*
|
|
* 7) StoreConstraints is called () - vadim 08/22/97
|
|
*
|
|
* 8) the relations are closed and the new relation's oid
|
|
* is returned.
|
|
*
|
|
* old comments:
|
|
* A new relation is inserted into the RELATION relation
|
|
* with the specified attribute(s) (newly inserted into
|
|
* the ATTRIBUTE relation). How does concurrency control
|
|
* work? Is it automatic now? Expects the caller to have
|
|
* attname, atttypid, atttyparg, attproc, and attlen domains filled.
|
|
* Create fills the attnum domains sequentually from zero,
|
|
* fills the attdisbursion domains with zeros, and fills the
|
|
* attrelid fields with the relid.
|
|
*
|
|
* scan relation catalog for name conflict
|
|
* scan type catalog for typids (if not arg)
|
|
* create and insert attribute(s) into attribute catalog
|
|
* create new relation
|
|
* insert new relation into attribute catalog
|
|
*
|
|
* Should coordinate with heap_creater(). Either it should
|
|
* not be called or there should be a way to prevent
|
|
* the relation from being removed at the end of the
|
|
* transaction if it is successful ('u'/'r' may be enough).
|
|
* Also, if the transaction does not commit, then the
|
|
* relation should be removed.
|
|
*
|
|
* XXX amcreate ignores "off" when inserting (for now).
|
|
* XXX amcreate (like the other utilities) needs to understand indexes.
|
|
*
|
|
* ----------------------------------------------------------------
|
|
*/
|
|
|
|
/* --------------------------------
|
|
* CheckAttributeNames
|
|
*
|
|
* this is used to make certain the tuple descriptor contains a
|
|
* valid set of attribute names. a problem simply generates
|
|
* elog(WARN) which aborts the current transaction.
|
|
* --------------------------------
|
|
*/
|
|
static void
|
|
CheckAttributeNames(TupleDesc tupdesc)
|
|
{
|
|
unsigned i;
|
|
unsigned j;
|
|
int natts = tupdesc->natts;
|
|
|
|
/* ----------------
|
|
* first check for collision with system attribute names
|
|
* ----------------
|
|
*
|
|
* also, warn user if attribute to be created has
|
|
* an unknown typid (usually as a result of a 'retrieve into'
|
|
* - jolly
|
|
*/
|
|
for (i = 0; i < natts; i += 1)
|
|
{
|
|
for (j = 0; j < sizeof HeapAtt / sizeof HeapAtt[0]; j += 1)
|
|
{
|
|
if (nameeq(&(HeapAtt[j]->attname),
|
|
&(tupdesc->attrs[i]->attname)))
|
|
{
|
|
elog(WARN,
|
|
"create: system attribute named \"%s\"",
|
|
HeapAtt[j]->attname.data);
|
|
}
|
|
}
|
|
if (tupdesc->attrs[i]->atttypid == UNKNOWNOID)
|
|
{
|
|
elog(NOTICE,
|
|
"create: attribute named \"%s\" has an unknown type",
|
|
tupdesc->attrs[i]->attname.data);
|
|
}
|
|
}
|
|
|
|
/* ----------------
|
|
* next check for repeated attribute names
|
|
* ----------------
|
|
*/
|
|
for (i = 1; i < natts; i += 1)
|
|
{
|
|
for (j = 0; j < i; j += 1)
|
|
{
|
|
if (nameeq(&(tupdesc->attrs[j]->attname),
|
|
&(tupdesc->attrs[i]->attname)))
|
|
{
|
|
elog(WARN,
|
|
"create: repeated attribute \"%s\"",
|
|
tupdesc->attrs[j]->attname.data);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* --------------------------------
|
|
* RelationAlreadyExists
|
|
*
|
|
* this preforms a scan of pg_class to ensure that
|
|
* no relation with the same name already exists. The caller
|
|
* has to open pg_class and pass an open descriptor.
|
|
* --------------------------------
|
|
*/
|
|
static int
|
|
RelationAlreadyExists(Relation pg_class_desc, char relname[])
|
|
{
|
|
ScanKeyData key;
|
|
HeapScanDesc pg_class_scan;
|
|
HeapTuple tup;
|
|
|
|
/*
|
|
* If this is not bootstrap (initdb) time, use the catalog index on
|
|
* pg_class.
|
|
*/
|
|
|
|
if (!IsBootstrapProcessingMode())
|
|
{
|
|
tup = ClassNameIndexScan(pg_class_desc, relname);
|
|
if (HeapTupleIsValid(tup))
|
|
{
|
|
pfree(tup);
|
|
return ((int) true);
|
|
}
|
|
else
|
|
return ((int) false);
|
|
}
|
|
|
|
/* ----------------
|
|
* At bootstrap time, we have to do this the hard way. Form the
|
|
* scan key.
|
|
* ----------------
|
|
*/
|
|
ScanKeyEntryInitialize(&key,
|
|
0,
|
|
(AttrNumber) Anum_pg_class_relname,
|
|
(RegProcedure) NameEqualRegProcedure,
|
|
(Datum) relname);
|
|
|
|
/* ----------------
|
|
* begin the scan
|
|
* ----------------
|
|
*/
|
|
pg_class_scan = heap_beginscan(pg_class_desc,
|
|
0,
|
|
false,
|
|
1,
|
|
&key);
|
|
|
|
/* ----------------
|
|
* get a tuple. if the tuple is NULL then it means we
|
|
* didn't find an existing relation.
|
|
* ----------------
|
|
*/
|
|
tup = heap_getnext(pg_class_scan, 0, (Buffer *) NULL);
|
|
|
|
/* ----------------
|
|
* end the scan and return existance of relation.
|
|
* ----------------
|
|
*/
|
|
heap_endscan(pg_class_scan);
|
|
|
|
return
|
|
(PointerIsValid(tup) == true);
|
|
}
|
|
|
|
/* --------------------------------
|
|
* AddNewAttributeTuples
|
|
*
|
|
* this registers the new relation's schema by adding
|
|
* tuples to pg_attribute.
|
|
* --------------------------------
|
|
*/
|
|
static void
|
|
AddNewAttributeTuples(Oid new_rel_oid,
|
|
TupleDesc tupdesc)
|
|
{
|
|
AttributeTupleForm *dpp;
|
|
unsigned i;
|
|
HeapTuple tup;
|
|
Relation rdesc;
|
|
bool hasindex;
|
|
Relation idescs[Num_pg_attr_indices];
|
|
int natts = tupdesc->natts;
|
|
|
|
/* ----------------
|
|
* open pg_attribute
|
|
* ----------------
|
|
*/
|
|
rdesc = heap_openr(AttributeRelationName);
|
|
|
|
/* -----------------
|
|
* Check if we have any indices defined on pg_attribute.
|
|
* -----------------
|
|
*/
|
|
Assert(rdesc);
|
|
Assert(rdesc->rd_rel);
|
|
hasindex = RelationGetRelationTupleForm(rdesc)->relhasindex;
|
|
if (hasindex)
|
|
CatalogOpenIndices(Num_pg_attr_indices, Name_pg_attr_indices, idescs);
|
|
|
|
/* ----------------
|
|
* initialize tuple descriptor. Note we use setheapoverride()
|
|
* so that we can see the effects of our TypeDefine() done
|
|
* previously.
|
|
* ----------------
|
|
*/
|
|
setheapoverride(true);
|
|
fillatt(tupdesc);
|
|
setheapoverride(false);
|
|
|
|
/* ----------------
|
|
* first we add the user attributes..
|
|
* ----------------
|
|
*/
|
|
dpp = tupdesc->attrs;
|
|
for (i = 0; i < natts; i++)
|
|
{
|
|
(*dpp)->attrelid = new_rel_oid;
|
|
(*dpp)->attdisbursion = 0;
|
|
|
|
tup = heap_addheader(Natts_pg_attribute,
|
|
ATTRIBUTE_TUPLE_SIZE,
|
|
(char *) *dpp);
|
|
|
|
heap_insert(rdesc, tup);
|
|
if (hasindex)
|
|
CatalogIndexInsert(idescs, Num_pg_attr_indices, rdesc, tup);
|
|
|
|
pfree(tup);
|
|
dpp++;
|
|
}
|
|
|
|
/* ----------------
|
|
* next we add the system attributes..
|
|
* ----------------
|
|
*/
|
|
dpp = HeapAtt;
|
|
for (i = 0; i < -1 - FirstLowInvalidHeapAttributeNumber; i++)
|
|
{
|
|
(*dpp)->attrelid = new_rel_oid;
|
|
/* (*dpp)->attdisbursion = 0; unneeded */
|
|
|
|
tup = heap_addheader(Natts_pg_attribute,
|
|
ATTRIBUTE_TUPLE_SIZE,
|
|
(char *) *dpp);
|
|
|
|
heap_insert(rdesc, tup);
|
|
|
|
if (hasindex)
|
|
CatalogIndexInsert(idescs, Num_pg_attr_indices, rdesc, tup);
|
|
|
|
pfree(tup);
|
|
dpp++;
|
|
}
|
|
|
|
heap_close(rdesc);
|
|
|
|
/*
|
|
* close pg_attribute indices
|
|
*/
|
|
if (hasindex)
|
|
CatalogCloseIndices(Num_pg_attr_indices, idescs);
|
|
}
|
|
|
|
/* --------------------------------
|
|
* AddPgRelationTuple
|
|
*
|
|
* this registers the new relation in the catalogs by
|
|
* adding a tuple to pg_class.
|
|
* --------------------------------
|
|
*/
|
|
static void
|
|
AddPgRelationTuple(Relation pg_class_desc,
|
|
Relation new_rel_desc,
|
|
Oid new_rel_oid,
|
|
unsigned natts)
|
|
{
|
|
Form_pg_class new_rel_reltup;
|
|
HeapTuple tup;
|
|
Relation idescs[Num_pg_class_indices];
|
|
bool isBootstrap;
|
|
extern bool ItsSequenceCreation; /* It's hack, I know... - vadim
|
|
* 03/28/97 */
|
|
|
|
/* ----------------
|
|
* first we munge some of the information in our
|
|
* uncataloged relation's relation descriptor.
|
|
* ----------------
|
|
*/
|
|
new_rel_reltup = new_rel_desc->rd_rel;
|
|
|
|
/* CHECK should get new_rel_oid first via an insert then use XXX */
|
|
/* new_rel_reltup->reltuples = 1; *//* XXX */
|
|
|
|
new_rel_reltup->relowner = GetUserId();
|
|
if (ItsSequenceCreation)
|
|
new_rel_reltup->relkind = RELKIND_SEQUENCE;
|
|
else
|
|
new_rel_reltup->relkind = RELKIND_RELATION;
|
|
new_rel_reltup->relnatts = natts;
|
|
|
|
/* ----------------
|
|
* now form a tuple to add to pg_class
|
|
* XXX Natts_pg_class_fixed is a hack - see pg_class.h
|
|
* ----------------
|
|
*/
|
|
tup = heap_addheader(Natts_pg_class_fixed,
|
|
CLASS_TUPLE_SIZE,
|
|
(char *) new_rel_reltup);
|
|
tup->t_oid = new_rel_oid;
|
|
|
|
/* ----------------
|
|
* finally insert the new tuple and free it.
|
|
*
|
|
* Note: I have no idea why we do a
|
|
* SetProcessingMode(BootstrapProcessing);
|
|
* here -cim 6/14/90
|
|
* ----------------
|
|
*/
|
|
isBootstrap = IsBootstrapProcessingMode() ? true : false;
|
|
|
|
SetProcessingMode(BootstrapProcessing);
|
|
|
|
heap_insert(pg_class_desc, tup);
|
|
|
|
if (!isBootstrap)
|
|
{
|
|
|
|
/*
|
|
* First, open the catalog indices and insert index tuples for the
|
|
* new relation.
|
|
*/
|
|
|
|
CatalogOpenIndices(Num_pg_class_indices, Name_pg_class_indices, idescs);
|
|
CatalogIndexInsert(idescs, Num_pg_class_indices, pg_class_desc, tup);
|
|
CatalogCloseIndices(Num_pg_class_indices, idescs);
|
|
|
|
/* now restore processing mode */
|
|
SetProcessingMode(NormalProcessing);
|
|
}
|
|
|
|
pfree(tup);
|
|
}
|
|
|
|
|
|
/* --------------------------------
|
|
* addNewRelationType -
|
|
*
|
|
* define a complex type corresponding to the new relation
|
|
* --------------------------------
|
|
*/
|
|
static void
|
|
addNewRelationType(char *typeName, Oid new_rel_oid)
|
|
{
|
|
Oid new_type_oid;
|
|
|
|
/*
|
|
* The sizes are set to oid size because it makes implementing sets
|
|
* MUCH easier, and no one (we hope) uses these fields to figure out
|
|
* how much space to allocate for the type. An oid is the type used
|
|
* for a set definition. When a user requests a set, what they
|
|
* actually get is the oid of a tuple in the pg_proc catalog, so the
|
|
* size of the "set" is the size of an oid. Similarly, byval being
|
|
* true makes sets much easier, and it isn't used by anything else.
|
|
* Note the assumption that OIDs are the same size as int4s.
|
|
*/
|
|
new_type_oid = TypeCreate(typeName, /* type name */
|
|
new_rel_oid, /* relation oid */
|
|
tlen(type("oid")), /* internal size */
|
|
tlen(type("oid")), /* external size */
|
|
'c', /* type-type (catalog) */
|
|
',', /* default array delimiter */
|
|
"int4in", /* input procedure */
|
|
"int4out", /* output procedure */
|
|
"int4in", /* send procedure */
|
|
"int4out", /* receive procedure */
|
|
NULL, /* array element type - irrelevent */
|
|
"-", /* default type value */
|
|
(bool) 1, /* passed by value */
|
|
'i'); /* default alignment */
|
|
}
|
|
|
|
/* --------------------------------
|
|
* heap_create
|
|
*
|
|
* creates a new cataloged relation. see comments above.
|
|
* --------------------------------
|
|
*/
|
|
Oid
|
|
heap_create(char relname[],
|
|
TupleDesc tupdesc)
|
|
{
|
|
Relation pg_class_desc;
|
|
Relation new_rel_desc;
|
|
Oid new_rel_oid;
|
|
|
|
int natts = tupdesc->natts;
|
|
|
|
/* ----------------
|
|
* sanity checks
|
|
* ----------------
|
|
*/
|
|
AssertState(IsNormalProcessingMode() || IsBootstrapProcessingMode());
|
|
if (natts == 0 || natts > MaxHeapAttributeNumber)
|
|
elog(WARN, "amcreate: from 1 to %d attributes must be specified",
|
|
MaxHeapAttributeNumber);
|
|
|
|
CheckAttributeNames(tupdesc);
|
|
|
|
/* ----------------
|
|
* open pg_class and see that the relation doesn't
|
|
* already exist.
|
|
* ----------------
|
|
*/
|
|
pg_class_desc = heap_openr(RelationRelationName);
|
|
|
|
if (RelationAlreadyExists(pg_class_desc, relname))
|
|
{
|
|
heap_close(pg_class_desc);
|
|
elog(WARN, "amcreate: %s relation already exists", relname);
|
|
}
|
|
|
|
/* ----------------
|
|
* ok, relation does not already exist so now we
|
|
* create an uncataloged relation and pull its relation oid
|
|
* from the newly formed relation descriptor.
|
|
*
|
|
* Note: The call to heap_creatr() does all the "real" work
|
|
* of creating the disk file for the relation.
|
|
* ----------------
|
|
*/
|
|
new_rel_desc = heap_creatr(relname, tupdesc);
|
|
new_rel_oid = new_rel_desc->rd_att->attrs[0]->attrelid;
|
|
|
|
/* ----------------
|
|
* since defining a relation also defines a complex type,
|
|
* we add a new system type corresponding to the new relation.
|
|
* ----------------
|
|
*/
|
|
addNewRelationType(relname, new_rel_oid);
|
|
|
|
/* ----------------
|
|
* now add tuples to pg_attribute for the attributes in
|
|
* our new relation.
|
|
* ----------------
|
|
*/
|
|
AddNewAttributeTuples(new_rel_oid, tupdesc);
|
|
|
|
/* ----------------
|
|
* now update the information in pg_class.
|
|
* ----------------
|
|
*/
|
|
AddPgRelationTuple(pg_class_desc,
|
|
new_rel_desc,
|
|
new_rel_oid,
|
|
natts);
|
|
|
|
StoreConstraints(new_rel_desc);
|
|
|
|
/* ----------------
|
|
* ok, the relation has been cataloged, so close our relations
|
|
* and return the oid of the newly created relation.
|
|
*
|
|
* SOMEDAY: fill the STATISTIC relation properly.
|
|
* ----------------
|
|
*/
|
|
heap_close(new_rel_desc);
|
|
heap_close(pg_class_desc);
|
|
|
|
return new_rel_oid;
|
|
}
|
|
|
|
|
|
/* ----------------------------------------------------------------
|
|
* heap_destroy - removes all record of named relation from catalogs
|
|
*
|
|
* 1) open relation, check for existence, etc.
|
|
* 2) remove inheritance information
|
|
* 3) remove indexes
|
|
* 4) remove pg_class tuple
|
|
* 5) remove pg_attribute tuples
|
|
* 6) remove pg_type tuples
|
|
* 7) RemoveConstraints ()
|
|
* 8) unlink relation
|
|
*
|
|
* old comments
|
|
* Except for vital relations, removes relation from
|
|
* relation catalog, and related attributes from
|
|
* attribute catalog (needed?). (Anything else?)
|
|
*
|
|
* get proper relation from relation catalog (if not arg)
|
|
* check if relation is vital (strcmp()/reltype?)
|
|
* scan attribute catalog deleting attributes of reldesc
|
|
* (necessary?)
|
|
* delete relation from relation catalog
|
|
* (How are the tuples of the relation discarded?)
|
|
*
|
|
* XXX Must fix to work with indexes.
|
|
* There may be a better order for doing things.
|
|
* Problems with destroying a deleted database--cannot create
|
|
* a struct reldesc without having an open file descriptor.
|
|
* ----------------------------------------------------------------
|
|
*/
|
|
|
|
/* --------------------------------
|
|
* RelationRemoveInheritance
|
|
*
|
|
* Note: for now, we cause an exception if relation is a
|
|
* superclass. Someday, we may want to allow this and merge
|
|
* the type info into subclass procedures.... this seems like
|
|
* lots of work.
|
|
* --------------------------------
|
|
*/
|
|
static void
|
|
RelationRemoveInheritance(Relation relation)
|
|
{
|
|
Relation catalogRelation;
|
|
HeapTuple tuple;
|
|
HeapScanDesc scan;
|
|
ScanKeyData entry;
|
|
|
|
/* ----------------
|
|
* open pg_inherits
|
|
* ----------------
|
|
*/
|
|
catalogRelation = heap_openr(InheritsRelationName);
|
|
|
|
/* ----------------
|
|
* form a scan key for the subclasses of this class
|
|
* and begin scanning
|
|
* ----------------
|
|
*/
|
|
ScanKeyEntryInitialize(&entry, 0x0, Anum_pg_inherits_inhparent,
|
|
ObjectIdEqualRegProcedure,
|
|
ObjectIdGetDatum(RelationGetRelationId(relation)));
|
|
|
|
scan = heap_beginscan(catalogRelation,
|
|
false,
|
|
false,
|
|
1,
|
|
&entry);
|
|
|
|
/* ----------------
|
|
* if any subclasses exist, then we disallow the deletion.
|
|
* ----------------
|
|
*/
|
|
tuple = heap_getnext(scan, 0, (Buffer *) NULL);
|
|
if (HeapTupleIsValid(tuple))
|
|
{
|
|
heap_endscan(scan);
|
|
heap_close(catalogRelation);
|
|
|
|
elog(WARN, "relation <%d> inherits \"%s\"",
|
|
((InheritsTupleForm) GETSTRUCT(tuple))->inhrel,
|
|
RelationGetRelationName(relation));
|
|
}
|
|
|
|
/* ----------------
|
|
* If we get here, it means the relation has no subclasses
|
|
* so we can trash it. First we remove dead INHERITS tuples.
|
|
* ----------------
|
|
*/
|
|
entry.sk_attno = Anum_pg_inherits_inhrel;
|
|
|
|
scan = heap_beginscan(catalogRelation,
|
|
false,
|
|
false,
|
|
1,
|
|
&entry);
|
|
|
|
for (;;)
|
|
{
|
|
tuple = heap_getnext(scan, 0, (Buffer *) NULL);
|
|
if (!HeapTupleIsValid(tuple))
|
|
{
|
|
break;
|
|
}
|
|
heap_delete(catalogRelation, &tuple->t_ctid);
|
|
}
|
|
|
|
heap_endscan(scan);
|
|
heap_close(catalogRelation);
|
|
|
|
/* ----------------
|
|
* now remove dead IPL tuples
|
|
* ----------------
|
|
*/
|
|
catalogRelation =
|
|
heap_openr(InheritancePrecidenceListRelationName);
|
|
|
|
entry.sk_attno = Anum_pg_ipl_iplrel;
|
|
|
|
scan = heap_beginscan(catalogRelation,
|
|
false,
|
|
false,
|
|
1,
|
|
&entry);
|
|
|
|
for (;;)
|
|
{
|
|
tuple = heap_getnext(scan, 0, (Buffer *) NULL);
|
|
if (!HeapTupleIsValid(tuple))
|
|
{
|
|
break;
|
|
}
|
|
heap_delete(catalogRelation, &tuple->t_ctid);
|
|
}
|
|
|
|
heap_endscan(scan);
|
|
heap_close(catalogRelation);
|
|
}
|
|
|
|
/* --------------------------------
|
|
* RelationRemoveIndexes
|
|
*
|
|
* --------------------------------
|
|
*/
|
|
static void
|
|
RelationRemoveIndexes(Relation relation)
|
|
{
|
|
Relation indexRelation;
|
|
HeapTuple tuple;
|
|
HeapScanDesc scan;
|
|
ScanKeyData entry;
|
|
|
|
indexRelation = heap_openr(IndexRelationName);
|
|
|
|
ScanKeyEntryInitialize(&entry, 0x0, Anum_pg_index_indrelid,
|
|
ObjectIdEqualRegProcedure,
|
|
ObjectIdGetDatum(RelationGetRelationId(relation)));
|
|
|
|
scan = heap_beginscan(indexRelation,
|
|
false,
|
|
false,
|
|
1,
|
|
&entry);
|
|
|
|
for (;;)
|
|
{
|
|
tuple = heap_getnext(scan, 0, (Buffer *) NULL);
|
|
if (!HeapTupleIsValid(tuple))
|
|
{
|
|
break;
|
|
}
|
|
|
|
index_destroy(((IndexTupleForm) GETSTRUCT(tuple))->indexrelid);
|
|
}
|
|
|
|
heap_endscan(scan);
|
|
heap_close(indexRelation);
|
|
}
|
|
|
|
/* --------------------------------
|
|
* DeletePgRelationTuple
|
|
*
|
|
* --------------------------------
|
|
*/
|
|
static void
|
|
DeletePgRelationTuple(Relation rdesc)
|
|
{
|
|
Relation pg_class_desc;
|
|
HeapScanDesc pg_class_scan;
|
|
ScanKeyData key;
|
|
HeapTuple tup;
|
|
|
|
/* ----------------
|
|
* open pg_class
|
|
* ----------------
|
|
*/
|
|
pg_class_desc = heap_openr(RelationRelationName);
|
|
|
|
/* ----------------
|
|
* create a scan key to locate the relation oid of the
|
|
* relation to delete
|
|
* ----------------
|
|
*/
|
|
ScanKeyEntryInitialize(&key, 0, ObjectIdAttributeNumber,
|
|
F_INT4EQ, rdesc->rd_att->attrs[0]->attrelid);
|
|
|
|
pg_class_scan = heap_beginscan(pg_class_desc,
|
|
0,
|
|
false,
|
|
1,
|
|
&key);
|
|
|
|
/* ----------------
|
|
* use heap_getnext() to fetch the pg_class tuple. If this
|
|
* tuple is not valid then something's wrong.
|
|
* ----------------
|
|
*/
|
|
tup = heap_getnext(pg_class_scan, 0, (Buffer *) NULL);
|
|
|
|
if (!PointerIsValid(tup))
|
|
{
|
|
heap_endscan(pg_class_scan);
|
|
heap_close(pg_class_desc);
|
|
elog(WARN, "DeletePgRelationTuple: %s relation nonexistent",
|
|
&rdesc->rd_rel->relname);
|
|
}
|
|
|
|
/* ----------------
|
|
* delete the relation tuple from pg_class, and finish up.
|
|
* ----------------
|
|
*/
|
|
heap_endscan(pg_class_scan);
|
|
heap_delete(pg_class_desc, &tup->t_ctid);
|
|
|
|
heap_close(pg_class_desc);
|
|
}
|
|
|
|
/* --------------------------------
|
|
* DeletePgAttributeTuples
|
|
*
|
|
* --------------------------------
|
|
*/
|
|
static void
|
|
DeletePgAttributeTuples(Relation rdesc)
|
|
{
|
|
Relation pg_attribute_desc;
|
|
HeapScanDesc pg_attribute_scan;
|
|
ScanKeyData key;
|
|
HeapTuple tup;
|
|
|
|
/* ----------------
|
|
* open pg_attribute
|
|
* ----------------
|
|
*/
|
|
pg_attribute_desc = heap_openr(AttributeRelationName);
|
|
|
|
/* ----------------
|
|
* create a scan key to locate the attribute tuples to delete
|
|
* and begin the scan.
|
|
* ----------------
|
|
*/
|
|
ScanKeyEntryInitialize(&key, 0, Anum_pg_attribute_attrelid,
|
|
F_INT4EQ, rdesc->rd_att->attrs[0]->attrelid);
|
|
|
|
/* -----------------
|
|
* Get a write lock _before_ getting the read lock in the scan
|
|
* ----------------
|
|
*/
|
|
RelationSetLockForWrite(pg_attribute_desc);
|
|
|
|
pg_attribute_scan = heap_beginscan(pg_attribute_desc,
|
|
0,
|
|
false,
|
|
1,
|
|
&key);
|
|
|
|
/* ----------------
|
|
* use heap_getnext() / amdelete() until all attribute tuples
|
|
* have been deleted.
|
|
* ----------------
|
|
*/
|
|
while (tup = heap_getnext(pg_attribute_scan, 0, (Buffer *) NULL),
|
|
PointerIsValid(tup))
|
|
{
|
|
|
|
heap_delete(pg_attribute_desc, &tup->t_ctid);
|
|
}
|
|
|
|
/* ----------------
|
|
* finish up.
|
|
* ----------------
|
|
*/
|
|
heap_endscan(pg_attribute_scan);
|
|
|
|
/* ----------------
|
|
* Release the write lock
|
|
* ----------------
|
|
*/
|
|
RelationUnsetLockForWrite(pg_attribute_desc);
|
|
heap_close(pg_attribute_desc);
|
|
}
|
|
|
|
|
|
/* --------------------------------
|
|
* DeletePgTypeTuple
|
|
*
|
|
* If the user attempts to destroy a relation and there
|
|
* exists attributes in other relations of type
|
|
* "relation we are deleting", then we have to do something
|
|
* special. presently we disallow the destroy.
|
|
* --------------------------------
|
|
*/
|
|
static void
|
|
DeletePgTypeTuple(Relation rdesc)
|
|
{
|
|
Relation pg_type_desc;
|
|
HeapScanDesc pg_type_scan;
|
|
Relation pg_attribute_desc;
|
|
HeapScanDesc pg_attribute_scan;
|
|
ScanKeyData key;
|
|
ScanKeyData attkey;
|
|
HeapTuple tup;
|
|
HeapTuple atttup;
|
|
Oid typoid;
|
|
|
|
/* ----------------
|
|
* open pg_type
|
|
* ----------------
|
|
*/
|
|
pg_type_desc = heap_openr(TypeRelationName);
|
|
|
|
/* ----------------
|
|
* create a scan key to locate the type tuple corresponding
|
|
* to this relation.
|
|
* ----------------
|
|
*/
|
|
ScanKeyEntryInitialize(&key, 0, Anum_pg_type_typrelid, F_INT4EQ,
|
|
rdesc->rd_att->attrs[0]->attrelid);
|
|
|
|
pg_type_scan = heap_beginscan(pg_type_desc,
|
|
0,
|
|
false,
|
|
1,
|
|
&key);
|
|
|
|
/* ----------------
|
|
* use heap_getnext() to fetch the pg_type tuple. If this
|
|
* tuple is not valid then something's wrong.
|
|
* ----------------
|
|
*/
|
|
tup = heap_getnext(pg_type_scan, 0, (Buffer *) NULL);
|
|
|
|
if (!PointerIsValid(tup))
|
|
{
|
|
heap_endscan(pg_type_scan);
|
|
heap_close(pg_type_desc);
|
|
elog(WARN, "DeletePgTypeTuple: %s type nonexistent",
|
|
&rdesc->rd_rel->relname);
|
|
}
|
|
|
|
/* ----------------
|
|
* now scan pg_attribute. if any other relations have
|
|
* attributes of the type of the relation we are deleteing
|
|
* then we have to disallow the deletion. should talk to
|
|
* stonebraker about this. -cim 6/19/90
|
|
* ----------------
|
|
*/
|
|
typoid = tup->t_oid;
|
|
|
|
pg_attribute_desc = heap_openr(AttributeRelationName);
|
|
|
|
ScanKeyEntryInitialize(&attkey,
|
|
0, Anum_pg_attribute_atttypid, F_INT4EQ,
|
|
typoid);
|
|
|
|
pg_attribute_scan = heap_beginscan(pg_attribute_desc,
|
|
0,
|
|
false,
|
|
1,
|
|
&attkey);
|
|
|
|
/* ----------------
|
|
* try and get a pg_attribute tuple. if we succeed it means
|
|
* we cant delete the relation because something depends on
|
|
* the schema.
|
|
* ----------------
|
|
*/
|
|
atttup = heap_getnext(pg_attribute_scan, 0, (Buffer *) NULL);
|
|
|
|
if (PointerIsValid(atttup))
|
|
{
|
|
Oid relid = ((AttributeTupleForm) GETSTRUCT(atttup))->attrelid;
|
|
|
|
heap_endscan(pg_type_scan);
|
|
heap_close(pg_type_desc);
|
|
heap_endscan(pg_attribute_scan);
|
|
heap_close(pg_attribute_desc);
|
|
|
|
elog(WARN, "DeletePgTypeTuple: att of type %s exists in relation %d",
|
|
&rdesc->rd_rel->relname, relid);
|
|
}
|
|
heap_endscan(pg_attribute_scan);
|
|
heap_close(pg_attribute_desc);
|
|
|
|
/* ----------------
|
|
* Ok, it's safe so we delete the relation tuple
|
|
* from pg_type and finish up. But first end the scan so that
|
|
* we release the read lock on pg_type. -mer 13 Aug 1991
|
|
* ----------------
|
|
*/
|
|
heap_endscan(pg_type_scan);
|
|
heap_delete(pg_type_desc, &tup->t_ctid);
|
|
|
|
heap_close(pg_type_desc);
|
|
}
|
|
|
|
/* --------------------------------
|
|
* heap_destroy
|
|
*
|
|
* --------------------------------
|
|
*/
|
|
void
|
|
heap_destroy(char *relname)
|
|
{
|
|
Relation rdesc;
|
|
Oid rid;
|
|
|
|
/* ----------------
|
|
* first open the relation. if the relation does exist,
|
|
* heap_openr() returns NULL.
|
|
* ----------------
|
|
*/
|
|
rdesc = heap_openr(relname);
|
|
if (rdesc == NULL)
|
|
elog(WARN, "Relation %s Does Not Exist!", relname);
|
|
|
|
RelationSetLockForWrite(rdesc);
|
|
rid = rdesc->rd_id;
|
|
|
|
/* ----------------
|
|
* prevent deletion of system relations
|
|
* ----------------
|
|
*/
|
|
if (IsSystemRelationName(RelationGetRelationName(rdesc)->data))
|
|
elog(WARN, "amdestroy: cannot destroy %s relation",
|
|
&rdesc->rd_rel->relname);
|
|
|
|
/* ----------------
|
|
* remove inheritance information
|
|
* ----------------
|
|
*/
|
|
RelationRemoveInheritance(rdesc);
|
|
|
|
/* ----------------
|
|
* remove indexes if necessary
|
|
* ----------------
|
|
*/
|
|
if (rdesc->rd_rel->relhasindex)
|
|
{
|
|
RelationRemoveIndexes(rdesc);
|
|
}
|
|
|
|
/* ----------------
|
|
* remove rules if necessary
|
|
* ----------------
|
|
*/
|
|
if (rdesc->rd_rules != NULL)
|
|
{
|
|
RelationRemoveRules(rid);
|
|
}
|
|
|
|
/* triggers */
|
|
if (rdesc->rd_rel->reltriggers > 0)
|
|
RelationRemoveTriggers(rdesc);
|
|
|
|
/* ----------------
|
|
* delete attribute tuples
|
|
* ----------------
|
|
*/
|
|
DeletePgAttributeTuples(rdesc);
|
|
|
|
/* ----------------
|
|
* delete type tuple. here we want to see the effects
|
|
* of the deletions we just did, so we use setheapoverride().
|
|
* ----------------
|
|
*/
|
|
setheapoverride(true);
|
|
DeletePgTypeTuple(rdesc);
|
|
setheapoverride(false);
|
|
|
|
/* ----------------
|
|
* delete relation tuple
|
|
* ----------------
|
|
*/
|
|
DeletePgRelationTuple(rdesc);
|
|
|
|
/*
|
|
* release dirty buffers of this relation
|
|
*/
|
|
ReleaseRelationBuffers(rdesc);
|
|
|
|
/* ----------------
|
|
* flush the relation from the relcache
|
|
* ----------------
|
|
* Does nothing!!! Flushing moved below. - vadim 06/04/97
|
|
RelationIdInvalidateRelationCacheByRelationId(rdesc->rd_id);
|
|
*/
|
|
|
|
RemoveConstraints(rdesc);
|
|
|
|
/* ----------------
|
|
* unlink the relation and finish up.
|
|
* ----------------
|
|
*/
|
|
if (!(rdesc->rd_istemp) || !(rdesc->rd_tmpunlinked))
|
|
{
|
|
smgrunlink(DEFAULT_SMGR, rdesc);
|
|
}
|
|
rdesc->rd_tmpunlinked = TRUE;
|
|
|
|
RelationUnsetLockForWrite(rdesc);
|
|
|
|
heap_close(rdesc);
|
|
|
|
/* ok - flush the relation from the relcache */
|
|
RelationForgetRelation(rid);
|
|
}
|
|
|
|
/*
|
|
* heap_destroyr
|
|
* destroy and close temporary relations
|
|
*
|
|
*/
|
|
|
|
void
|
|
heap_destroyr(Relation rdesc)
|
|
{
|
|
ReleaseRelationBuffers(rdesc);
|
|
if (!(rdesc->rd_istemp) || !(rdesc->rd_tmpunlinked))
|
|
smgrunlink(DEFAULT_SMGR, rdesc);
|
|
rdesc->rd_tmpunlinked = TRUE;
|
|
heap_close(rdesc);
|
|
RemoveFromTempRelList(rdesc);
|
|
}
|
|
|
|
|
|
/**************************************************************
|
|
functions to deal with the list of temporary relations
|
|
**************************************************************/
|
|
|
|
/* --------------
|
|
InitTempRellist():
|
|
|
|
initialize temporary relations list
|
|
the tempRelList is a list of temporary relations that
|
|
are created in the course of the transactions
|
|
they need to be destroyed properly at the end of the transactions
|
|
|
|
MODIFIES the global variable tempRels
|
|
|
|
>> NOTE <<
|
|
|
|
malloc is used instead of palloc because we KNOW when we are
|
|
going to free these things. Keeps us away from the memory context
|
|
hairyness
|
|
|
|
*/
|
|
void
|
|
InitTempRelList(void)
|
|
{
|
|
if (tempRels)
|
|
{
|
|
free(tempRels->rels);
|
|
free(tempRels);
|
|
}
|
|
|
|
tempRels = (TempRelList *) malloc(sizeof(TempRelList));
|
|
tempRels->size = TEMP_REL_LIST_SIZE;
|
|
tempRels->rels = (Relation *) malloc(sizeof(Relation) * tempRels->size);
|
|
MemSet(tempRels->rels, 0, sizeof(Relation) * tempRels->size);
|
|
tempRels->num = 0;
|
|
}
|
|
|
|
/*
|
|
removes a relation from the TempRelList
|
|
|
|
MODIFIES the global variable tempRels
|
|
we don't really remove it, just mark it as NULL
|
|
and DestroyTempRels will look for NULLs
|
|
*/
|
|
static void
|
|
RemoveFromTempRelList(Relation r)
|
|
{
|
|
int i;
|
|
|
|
if (!tempRels)
|
|
return;
|
|
|
|
for (i = 0; i < tempRels->num; i++)
|
|
{
|
|
if (tempRels->rels[i] == r)
|
|
{
|
|
tempRels->rels[i] = NULL;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
add a temporary relation to the TempRelList
|
|
|
|
MODIFIES the global variable tempRels
|
|
*/
|
|
static void
|
|
AddToTempRelList(Relation r)
|
|
{
|
|
if (!tempRels)
|
|
return;
|
|
|
|
if (tempRels->num == tempRels->size)
|
|
{
|
|
tempRels->size += TEMP_REL_LIST_SIZE;
|
|
tempRels->rels = realloc(tempRels->rels,
|
|
sizeof(Relation) * tempRels->size);
|
|
}
|
|
tempRels->rels[tempRels->num] = r;
|
|
tempRels->num++;
|
|
}
|
|
|
|
/*
|
|
go through the tempRels list and destroy each of the relations
|
|
*/
|
|
void
|
|
DestroyTempRels(void)
|
|
{
|
|
int i;
|
|
Relation rdesc;
|
|
|
|
if (!tempRels)
|
|
return;
|
|
|
|
for (i = 0; i < tempRels->num; i++)
|
|
{
|
|
rdesc = tempRels->rels[i];
|
|
/* rdesc may be NULL if it has been removed from the list already */
|
|
if (rdesc)
|
|
heap_destroyr(rdesc);
|
|
}
|
|
free(tempRels->rels);
|
|
free(tempRels);
|
|
tempRels = NULL;
|
|
}
|
|
|
|
extern List *flatten_tlist(List *tlist);
|
|
extern List *
|
|
pg_plan(char *query_string, Oid *typev, int nargs,
|
|
QueryTreeList **queryListP, CommandDest dest);
|
|
|
|
static void
|
|
StoreAttrDefault(Relation rel, AttrDefault *attrdef)
|
|
{
|
|
char str[MAX_PARSE_BUFFER];
|
|
char cast[2 * NAMEDATALEN] = {0};
|
|
AttributeTupleForm atp = rel->rd_att->attrs[attrdef->adnum - 1];
|
|
QueryTreeList *queryTree_list;
|
|
Query *query;
|
|
List *planTree_list;
|
|
TargetEntry *te;
|
|
Resdom *resdom;
|
|
Node *expr;
|
|
char *adbin;
|
|
MemoryContext oldcxt;
|
|
Relation adrel;
|
|
Relation idescs[Num_pg_attrdef_indices];
|
|
HeapTuple tuple;
|
|
Datum values[4];
|
|
char nulls[4] = {' ', ' ', ' ', ' '};
|
|
extern GlobalMemory CacheCxt;
|
|
|
|
start:;
|
|
sprintf(str, "select %s%s from %.*s", attrdef->adsrc, cast,
|
|
NAMEDATALEN, rel->rd_rel->relname.data);
|
|
setheapoverride(true);
|
|
planTree_list = (List *) pg_plan(str, NULL, 0, &queryTree_list, None);
|
|
setheapoverride(false);
|
|
query = (Query *) (queryTree_list->qtrees[0]);
|
|
|
|
if (length(query->rtable) > 1 ||
|
|
flatten_tlist(query->targetList) != NIL)
|
|
elog(WARN, "DEFAULT: cannot use attribute(s)");
|
|
te = (TargetEntry *) lfirst(query->targetList);
|
|
resdom = te->resdom;
|
|
expr = te->expr;
|
|
|
|
if (IsA(expr, Const))
|
|
{
|
|
if (((Const *) expr)->consttype != atp->atttypid)
|
|
{
|
|
if (*cast != 0)
|
|
elog(WARN, "DEFAULT: const type mismatched");
|
|
sprintf(cast, ":: %s", get_id_typname(atp->atttypid));
|
|
goto start;
|
|
}
|
|
}
|
|
else if (exprType(expr) != atp->atttypid)
|
|
elog(WARN, "DEFAULT: type mismatched");
|
|
|
|
adbin = nodeToString(expr);
|
|
oldcxt = MemoryContextSwitchTo((MemoryContext) CacheCxt);
|
|
attrdef->adbin = (char *) palloc(strlen(adbin) + 1);
|
|
strcpy(attrdef->adbin, adbin);
|
|
(void) MemoryContextSwitchTo(oldcxt);
|
|
pfree(adbin);
|
|
|
|
values[Anum_pg_attrdef_adrelid - 1] = rel->rd_id;
|
|
values[Anum_pg_attrdef_adnum - 1] = attrdef->adnum;
|
|
values[Anum_pg_attrdef_adbin - 1] = PointerGetDatum(textin(attrdef->adbin));
|
|
values[Anum_pg_attrdef_adsrc - 1] = PointerGetDatum(textin(attrdef->adsrc));
|
|
adrel = heap_openr(AttrDefaultRelationName);
|
|
tuple = heap_formtuple(adrel->rd_att, values, nulls);
|
|
CatalogOpenIndices(Num_pg_attrdef_indices, Name_pg_attrdef_indices, idescs);
|
|
heap_insert(adrel, tuple);
|
|
CatalogIndexInsert(idescs, Num_pg_attrdef_indices, adrel, tuple);
|
|
CatalogCloseIndices(Num_pg_attrdef_indices, idescs);
|
|
heap_close(adrel);
|
|
|
|
pfree(DatumGetPointer(values[Anum_pg_attrdef_adbin - 1]));
|
|
pfree(DatumGetPointer(values[Anum_pg_attrdef_adsrc - 1]));
|
|
pfree(tuple);
|
|
|
|
}
|
|
|
|
static void
|
|
StoreRelCheck(Relation rel, ConstrCheck *check)
|
|
{
|
|
char str[MAX_PARSE_BUFFER];
|
|
QueryTreeList *queryTree_list;
|
|
Query *query;
|
|
List *planTree_list;
|
|
Plan *plan;
|
|
List *qual;
|
|
char *ccbin;
|
|
MemoryContext oldcxt;
|
|
Relation rcrel;
|
|
Relation idescs[Num_pg_relcheck_indices];
|
|
HeapTuple tuple;
|
|
Datum values[4];
|
|
char nulls[4] = {' ', ' ', ' ', ' '};
|
|
extern GlobalMemory CacheCxt;
|
|
|
|
sprintf(str, "select 1 from %.*s where %s",
|
|
NAMEDATALEN, rel->rd_rel->relname.data, check->ccsrc);
|
|
setheapoverride(true);
|
|
planTree_list = (List *) pg_plan(str, NULL, 0, &queryTree_list, None);
|
|
setheapoverride(false);
|
|
query = (Query *) (queryTree_list->qtrees[0]);
|
|
|
|
if (length(query->rtable) > 1)
|
|
elog(WARN, "CHECK: only relation %.*s can be referenced",
|
|
NAMEDATALEN, rel->rd_rel->relname.data);
|
|
|
|
plan = (Plan *) lfirst(planTree_list);
|
|
qual = plan->qual;
|
|
|
|
ccbin = nodeToString(qual);
|
|
oldcxt = MemoryContextSwitchTo((MemoryContext) CacheCxt);
|
|
check->ccbin = (char *) palloc(strlen(ccbin) + 1);
|
|
strcpy(check->ccbin, ccbin);
|
|
(void) MemoryContextSwitchTo(oldcxt);
|
|
pfree(ccbin);
|
|
|
|
values[Anum_pg_relcheck_rcrelid - 1] = rel->rd_id;
|
|
values[Anum_pg_relcheck_rcname - 1] = PointerGetDatum(namein(check->ccname));
|
|
values[Anum_pg_relcheck_rcbin - 1] = PointerGetDatum(textin(check->ccbin));
|
|
values[Anum_pg_relcheck_rcsrc - 1] = PointerGetDatum(textin(check->ccsrc));
|
|
rcrel = heap_openr(RelCheckRelationName);
|
|
tuple = heap_formtuple(rcrel->rd_att, values, nulls);
|
|
CatalogOpenIndices(Num_pg_relcheck_indices, Name_pg_relcheck_indices, idescs);
|
|
heap_insert(rcrel, tuple);
|
|
CatalogIndexInsert(idescs, Num_pg_relcheck_indices, rcrel, tuple);
|
|
CatalogCloseIndices(Num_pg_relcheck_indices, idescs);
|
|
heap_close(rcrel);
|
|
|
|
pfree(DatumGetPointer(values[Anum_pg_relcheck_rcname - 1]));
|
|
pfree(DatumGetPointer(values[Anum_pg_relcheck_rcbin - 1]));
|
|
pfree(DatumGetPointer(values[Anum_pg_relcheck_rcsrc - 1]));
|
|
pfree(tuple);
|
|
|
|
return;
|
|
}
|
|
|
|
static void
|
|
StoreConstraints(Relation rel)
|
|
{
|
|
TupleConstr *constr = rel->rd_att->constr;
|
|
int i;
|
|
|
|
if (!constr)
|
|
return;
|
|
|
|
if (constr->num_defval > 0)
|
|
{
|
|
for (i = 0; i < constr->num_defval; i++)
|
|
StoreAttrDefault(rel, &(constr->defval[i]));
|
|
}
|
|
|
|
if (constr->num_check > 0)
|
|
{
|
|
for (i = 0; i < constr->num_check; i++)
|
|
StoreRelCheck(rel, &(constr->check[i]));
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
static void
|
|
RemoveAttrDefault(Relation rel)
|
|
{
|
|
Relation adrel;
|
|
HeapScanDesc adscan;
|
|
ScanKeyData key;
|
|
HeapTuple tup;
|
|
|
|
adrel = heap_openr(AttrDefaultRelationName);
|
|
|
|
ScanKeyEntryInitialize(&key, 0, Anum_pg_attrdef_adrelid,
|
|
ObjectIdEqualRegProcedure, rel->rd_id);
|
|
|
|
RelationSetLockForWrite(adrel);
|
|
|
|
adscan = heap_beginscan(adrel, 0, false, 1, &key);
|
|
|
|
while (tup = heap_getnext(adscan, 0, (Buffer *) NULL), PointerIsValid(tup))
|
|
heap_delete(adrel, &tup->t_ctid);
|
|
|
|
heap_endscan(adscan);
|
|
|
|
RelationUnsetLockForWrite(adrel);
|
|
heap_close(adrel);
|
|
|
|
}
|
|
|
|
static void
|
|
RemoveRelCheck(Relation rel)
|
|
{
|
|
Relation rcrel;
|
|
HeapScanDesc rcscan;
|
|
ScanKeyData key;
|
|
HeapTuple tup;
|
|
|
|
rcrel = heap_openr(RelCheckRelationName);
|
|
|
|
ScanKeyEntryInitialize(&key, 0, Anum_pg_relcheck_rcrelid,
|
|
ObjectIdEqualRegProcedure, rel->rd_id);
|
|
|
|
RelationSetLockForWrite(rcrel);
|
|
|
|
rcscan = heap_beginscan(rcrel, 0, false, 1, &key);
|
|
|
|
while (tup = heap_getnext(rcscan, 0, (Buffer *) NULL), PointerIsValid(tup))
|
|
heap_delete(rcrel, &tup->t_ctid);
|
|
|
|
heap_endscan(rcscan);
|
|
|
|
RelationUnsetLockForWrite(rcrel);
|
|
heap_close(rcrel);
|
|
|
|
}
|
|
|
|
static void
|
|
RemoveConstraints(Relation rel)
|
|
{
|
|
TupleConstr *constr = rel->rd_att->constr;
|
|
|
|
if (!constr)
|
|
return;
|
|
|
|
if (constr->num_defval > 0)
|
|
RemoveAttrDefault(rel);
|
|
|
|
if (constr->num_check > 0)
|
|
RemoveRelCheck(rel);
|
|
|
|
return;
|
|
}
|