2006-07-31 03:16:38 +02:00
|
|
|
/*-------------------------------------------------------------------------
|
|
|
|
*
|
|
|
|
* toasting.c
|
|
|
|
* This file contains routines to support creation of toast tables
|
|
|
|
*
|
|
|
|
*
|
2014-01-07 22:05:30 +01:00
|
|
|
* Portions Copyright (c) 1996-2014, PostgreSQL Global Development Group
|
2006-07-31 03:16:38 +02:00
|
|
|
* Portions Copyright (c) 1994, Regents of the University of California
|
|
|
|
*
|
|
|
|
* IDENTIFICATION
|
2010-09-20 22:08:53 +02:00
|
|
|
* src/backend/catalog/toasting.c
|
2006-07-31 03:16:38 +02:00
|
|
|
*
|
|
|
|
*-------------------------------------------------------------------------
|
|
|
|
*/
|
|
|
|
#include "postgres.h"
|
|
|
|
|
|
|
|
#include "access/tuptoaster.h"
|
|
|
|
#include "access/xact.h"
|
2013-12-19 22:10:01 +01:00
|
|
|
#include "catalog/binary_upgrade.h"
|
2006-07-31 03:16:38 +02:00
|
|
|
#include "catalog/dependency.h"
|
|
|
|
#include "catalog/heap.h"
|
|
|
|
#include "catalog/index.h"
|
2007-07-26 00:16:18 +02:00
|
|
|
#include "catalog/namespace.h"
|
2006-07-31 03:16:38 +02:00
|
|
|
#include "catalog/pg_namespace.h"
|
|
|
|
#include "catalog/pg_opclass.h"
|
|
|
|
#include "catalog/pg_type.h"
|
|
|
|
#include "catalog/toasting.h"
|
|
|
|
#include "miscadmin.h"
|
|
|
|
#include "nodes/makefuncs.h"
|
2014-04-06 17:13:43 +02:00
|
|
|
#include "storage/lock.h"
|
2006-07-31 03:16:38 +02:00
|
|
|
#include "utils/builtins.h"
|
2011-02-23 18:18:09 +01:00
|
|
|
#include "utils/rel.h"
|
2006-07-31 03:16:38 +02:00
|
|
|
#include "utils/syscache.h"
|
|
|
|
|
2011-01-07 04:44:57 +01:00
|
|
|
/* Potentially set by contrib/pg_upgrade_support functions */
|
2011-01-08 03:25:34 +01:00
|
|
|
Oid binary_upgrade_next_toast_pg_type_oid = InvalidOid;
|
2010-02-03 02:14:17 +01:00
|
|
|
|
2014-04-06 17:13:43 +02:00
|
|
|
static void CheckAndCreateToastTable(Oid relOid, Datum reloptions,
|
2014-05-06 18:12:18 +02:00
|
|
|
LOCKMODE lockmode, bool check);
|
2009-02-02 20:31:40 +01:00
|
|
|
static bool create_toast_table(Relation rel, Oid toastOid, Oid toastIndexOid,
|
2014-05-06 18:12:18 +02:00
|
|
|
Datum reloptions, LOCKMODE lockmode, bool check);
|
2006-07-31 03:16:38 +02:00
|
|
|
static bool needs_toast_table(Relation rel);
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
2014-04-06 17:13:43 +02:00
|
|
|
* CreateToastTable variants
|
2006-07-31 03:16:38 +02:00
|
|
|
* If the table needs a toast table, and doesn't already have one,
|
2010-01-06 04:04:03 +01:00
|
|
|
* then create a toast table for it.
|
2009-06-11 22:46:11 +02:00
|
|
|
*
|
2009-05-08 00:58:28 +02:00
|
|
|
* reloptions for the toast table can be passed, too. Pass (Datum) 0
|
|
|
|
* for default reloptions.
|
2006-07-31 03:16:38 +02:00
|
|
|
*
|
|
|
|
* We expect the caller to have verified that the relation is a table and have
|
|
|
|
* already done any necessary permission checks. Callers expect this function
|
|
|
|
* to end with CommandCounterIncrement if it makes any changes.
|
|
|
|
*/
|
|
|
|
void
|
2014-04-06 17:13:43 +02:00
|
|
|
AlterTableCreateToastTable(Oid relOid, Datum reloptions, LOCKMODE lockmode)
|
|
|
|
{
|
|
|
|
CheckAndCreateToastTable(relOid, reloptions, lockmode, true);
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
NewHeapCreateToastTable(Oid relOid, Datum reloptions, LOCKMODE lockmode)
|
|
|
|
{
|
|
|
|
CheckAndCreateToastTable(relOid, reloptions, lockmode, false);
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
NewRelationCreateToastTable(Oid relOid, Datum reloptions)
|
|
|
|
{
|
|
|
|
CheckAndCreateToastTable(relOid, reloptions, AccessExclusiveLock, false);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
CheckAndCreateToastTable(Oid relOid, Datum reloptions, LOCKMODE lockmode, bool check)
|
2006-07-31 03:16:38 +02:00
|
|
|
{
|
|
|
|
Relation rel;
|
|
|
|
|
2014-04-06 17:13:43 +02:00
|
|
|
rel = heap_open(relOid, lockmode);
|
2006-07-31 03:16:38 +02:00
|
|
|
|
|
|
|
/* create_toast_table does all the work */
|
2014-04-06 17:13:43 +02:00
|
|
|
(void) create_toast_table(rel, InvalidOid, InvalidOid, reloptions, lockmode, check);
|
2006-07-31 03:16:38 +02:00
|
|
|
|
|
|
|
heap_close(rel, NoLock);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Create a toast table during bootstrap
|
|
|
|
*
|
|
|
|
* Here we need to prespecify the OIDs of the toast table and its index
|
|
|
|
*/
|
|
|
|
void
|
|
|
|
BootstrapToastTable(char *relName, Oid toastOid, Oid toastIndexOid)
|
|
|
|
{
|
2006-10-04 02:30:14 +02:00
|
|
|
Relation rel;
|
2006-07-31 03:16:38 +02:00
|
|
|
|
2008-09-01 22:42:46 +02:00
|
|
|
rel = heap_openrv(makeRangeVar(NULL, relName, -1), AccessExclusiveLock);
|
2006-07-31 03:16:38 +02:00
|
|
|
|
2013-03-04 01:23:31 +01:00
|
|
|
if (rel->rd_rel->relkind != RELKIND_RELATION &&
|
|
|
|
rel->rd_rel->relkind != RELKIND_MATVIEW)
|
2006-07-31 03:16:38 +02:00
|
|
|
ereport(ERROR,
|
|
|
|
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
|
2013-03-04 01:23:31 +01:00
|
|
|
errmsg("\"%s\" is not a table or materialized view",
|
2006-07-31 03:16:38 +02:00
|
|
|
relName)));
|
|
|
|
|
|
|
|
/* create_toast_table does all the work */
|
2014-04-06 17:13:43 +02:00
|
|
|
if (!create_toast_table(rel, toastOid, toastIndexOid, (Datum) 0,
|
2014-05-06 18:12:18 +02:00
|
|
|
AccessExclusiveLock, false))
|
2006-07-31 03:16:38 +02:00
|
|
|
elog(ERROR, "\"%s\" does not require a toast table",
|
|
|
|
relName);
|
|
|
|
|
|
|
|
heap_close(rel, NoLock);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* create_toast_table --- internal workhorse
|
|
|
|
*
|
2011-04-14 03:07:14 +02:00
|
|
|
* rel is already opened and locked
|
2010-01-06 04:04:03 +01:00
|
|
|
* toastOid and toastIndexOid are normally InvalidOid, but during
|
|
|
|
* bootstrap they can be nonzero to specify hand-assigned OIDs
|
2006-07-31 03:16:38 +02:00
|
|
|
*/
|
|
|
|
static bool
|
2014-04-06 17:13:43 +02:00
|
|
|
create_toast_table(Relation rel, Oid toastOid, Oid toastIndexOid,
|
|
|
|
Datum reloptions, LOCKMODE lockmode, bool check)
|
2006-07-31 03:16:38 +02:00
|
|
|
{
|
|
|
|
Oid relOid = RelationGetRelid(rel);
|
|
|
|
HeapTuple reltup;
|
|
|
|
TupleDesc tupdesc;
|
|
|
|
bool shared_relation;
|
2010-02-07 21:48:13 +01:00
|
|
|
bool mapped_relation;
|
2011-01-25 21:42:03 +01:00
|
|
|
Relation toast_rel;
|
2006-07-31 03:16:38 +02:00
|
|
|
Relation class_rel;
|
|
|
|
Oid toast_relid;
|
2009-12-24 23:09:24 +01:00
|
|
|
Oid toast_typid = InvalidOid;
|
2007-07-26 00:16:18 +02:00
|
|
|
Oid namespaceid;
|
2006-07-31 03:16:38 +02:00
|
|
|
char toast_relname[NAMEDATALEN];
|
|
|
|
char toast_idxname[NAMEDATALEN];
|
|
|
|
IndexInfo *indexInfo;
|
2011-02-08 22:04:18 +01:00
|
|
|
Oid collationObjectId[2];
|
2006-07-31 03:16:38 +02:00
|
|
|
Oid classObjectId[2];
|
2007-01-09 03:14:16 +01:00
|
|
|
int16 coloptions[2];
|
2006-07-31 03:16:38 +02:00
|
|
|
ObjectAddress baseobject,
|
|
|
|
toastobject;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Toast table is shared if and only if its parent is.
|
|
|
|
*
|
|
|
|
* We cannot allow toasting a shared relation after initdb (because
|
|
|
|
* there's no way to mark it toasted in other databases' pg_class).
|
|
|
|
*/
|
|
|
|
shared_relation = rel->rd_rel->relisshared;
|
|
|
|
if (shared_relation && !IsBootstrapProcessingMode())
|
|
|
|
ereport(ERROR,
|
|
|
|
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
|
|
|
|
errmsg("shared tables cannot be toasted after initdb")));
|
|
|
|
|
2010-02-07 21:48:13 +01:00
|
|
|
/* It's mapped if and only if its parent is, too */
|
|
|
|
mapped_relation = RelationIsMapped(rel);
|
|
|
|
|
2006-07-31 03:16:38 +02:00
|
|
|
/*
|
|
|
|
* Is it already toasted?
|
|
|
|
*/
|
|
|
|
if (rel->rd_rel->reltoastrelid != InvalidOid)
|
|
|
|
return false;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Check to see whether the table actually needs a TOAST table.
|
2010-02-03 02:14:17 +01:00
|
|
|
*
|
2010-02-07 21:48:13 +01:00
|
|
|
* If an update-in-place toast relfilenode is specified, force toast file
|
2010-02-03 02:14:17 +01:00
|
|
|
* creation even if it seems not to need one.
|
2006-07-31 03:16:38 +02:00
|
|
|
*/
|
2010-01-06 04:04:03 +01:00
|
|
|
if (!needs_toast_table(rel) &&
|
2011-04-25 18:00:21 +02:00
|
|
|
(!IsBinaryUpgrade ||
|
|
|
|
!OidIsValid(binary_upgrade_next_toast_pg_class_oid)))
|
2006-07-31 03:16:38 +02:00
|
|
|
return false;
|
|
|
|
|
2014-04-06 17:13:43 +02:00
|
|
|
/*
|
2014-05-06 18:12:18 +02:00
|
|
|
* If requested check lockmode is sufficient. This is a cross check in
|
|
|
|
* case of errors or conflicting decisions in earlier code.
|
2014-04-06 17:13:43 +02:00
|
|
|
*/
|
|
|
|
if (check && lockmode != AccessExclusiveLock)
|
|
|
|
elog(ERROR, "AccessExclusiveLock required to add toast table.");
|
|
|
|
|
2006-07-31 03:16:38 +02:00
|
|
|
/*
|
|
|
|
* Create the toast table and its index
|
|
|
|
*/
|
|
|
|
snprintf(toast_relname, sizeof(toast_relname),
|
|
|
|
"pg_toast_%u", relOid);
|
|
|
|
snprintf(toast_idxname, sizeof(toast_idxname),
|
|
|
|
"pg_toast_%u_index", relOid);
|
|
|
|
|
|
|
|
/* this is pretty painful... need a tuple descriptor */
|
|
|
|
tupdesc = CreateTemplateTupleDesc(3, false);
|
|
|
|
TupleDescInitEntry(tupdesc, (AttrNumber) 1,
|
|
|
|
"chunk_id",
|
|
|
|
OIDOID,
|
|
|
|
-1, 0);
|
|
|
|
TupleDescInitEntry(tupdesc, (AttrNumber) 2,
|
|
|
|
"chunk_seq",
|
|
|
|
INT4OID,
|
|
|
|
-1, 0);
|
|
|
|
TupleDescInitEntry(tupdesc, (AttrNumber) 3,
|
|
|
|
"chunk_data",
|
|
|
|
BYTEAOID,
|
|
|
|
-1, 0);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Ensure that the toast table doesn't itself get toasted, or we'll be
|
|
|
|
* toast :-(. This is essential for chunk_data because type bytea is
|
|
|
|
* toastable; hit the other two just to be sure.
|
|
|
|
*/
|
|
|
|
tupdesc->attrs[0]->attstorage = 'p';
|
|
|
|
tupdesc->attrs[1]->attstorage = 'p';
|
|
|
|
tupdesc->attrs[2]->attstorage = 'p';
|
|
|
|
|
|
|
|
/*
|
2007-07-26 00:16:18 +02:00
|
|
|
* Toast tables for regular relations go in pg_toast; those for temp
|
|
|
|
* relations go into the per-backend temp-toast-table namespace.
|
|
|
|
*/
|
2012-12-18 02:15:32 +01:00
|
|
|
if (isTempOrToastNamespace(rel->rd_rel->relnamespace))
|
2007-07-26 00:16:18 +02:00
|
|
|
namespaceid = GetTempToastNamespace();
|
|
|
|
else
|
|
|
|
namespaceid = PG_TOAST_NAMESPACE;
|
|
|
|
|
2011-01-07 04:44:57 +01:00
|
|
|
/* Use binary-upgrade override for pg_type.oid, if supplied. */
|
2011-04-25 18:00:21 +02:00
|
|
|
if (IsBinaryUpgrade && OidIsValid(binary_upgrade_next_toast_pg_type_oid))
|
2009-12-24 23:09:24 +01:00
|
|
|
{
|
2011-01-08 03:25:34 +01:00
|
|
|
toast_typid = binary_upgrade_next_toast_pg_type_oid;
|
|
|
|
binary_upgrade_next_toast_pg_type_oid = InvalidOid;
|
2009-12-24 23:09:24 +01:00
|
|
|
}
|
|
|
|
|
2006-07-31 03:16:38 +02:00
|
|
|
toast_relid = heap_create_with_catalog(toast_relname,
|
2007-07-26 00:16:18 +02:00
|
|
|
namespaceid,
|
2006-07-31 03:16:38 +02:00
|
|
|
rel->rd_rel->reltablespace,
|
|
|
|
toastOid,
|
2009-12-24 23:09:24 +01:00
|
|
|
toast_typid,
|
2010-01-29 00:21:13 +01:00
|
|
|
InvalidOid,
|
2006-07-31 03:16:38 +02:00
|
|
|
rel->rd_rel->relowner,
|
|
|
|
tupdesc,
|
2008-05-10 01:32:05 +02:00
|
|
|
NIL,
|
2006-07-31 03:16:38 +02:00
|
|
|
RELKIND_TOASTVALUE,
|
2010-12-13 18:34:26 +01:00
|
|
|
rel->rd_rel->relpersistence,
|
2006-07-31 03:16:38 +02:00
|
|
|
shared_relation,
|
2010-02-07 21:48:13 +01:00
|
|
|
mapped_relation,
|
2006-07-31 03:16:38 +02:00
|
|
|
true,
|
|
|
|
0,
|
|
|
|
ONCOMMIT_NOOP,
|
2009-02-02 20:31:40 +01:00
|
|
|
reloptions,
|
2009-10-05 21:24:49 +02:00
|
|
|
false,
|
2012-10-23 23:07:26 +02:00
|
|
|
true,
|
2011-04-25 22:55:11 +02:00
|
|
|
true);
|
2010-07-26 01:21:22 +02:00
|
|
|
Assert(toast_relid != InvalidOid);
|
2006-07-31 03:16:38 +02:00
|
|
|
|
2011-01-25 21:42:03 +01:00
|
|
|
/* make the toast relation visible, else heap_open will fail */
|
2006-07-31 03:16:38 +02:00
|
|
|
CommandCounterIncrement();
|
|
|
|
|
2011-01-25 21:42:03 +01:00
|
|
|
/* ShareLock is not really needed here, but take it anyway */
|
|
|
|
toast_rel = heap_open(toast_relid, ShareLock);
|
|
|
|
|
2006-07-31 03:16:38 +02:00
|
|
|
/*
|
|
|
|
* Create unique index on chunk_id, chunk_seq.
|
|
|
|
*
|
|
|
|
* NOTE: the normal TOAST access routines could actually function with a
|
|
|
|
* single-column index on chunk_id only. However, the slice access
|
|
|
|
* routines use both columns for faster access to an individual chunk. In
|
|
|
|
* addition, we want it to be unique as a check against the possibility of
|
|
|
|
* duplicate TOAST chunk OIDs. The index might also be a little more
|
|
|
|
* efficient this way, since btree isn't all that happy with large numbers
|
|
|
|
* of equal keys.
|
|
|
|
*/
|
|
|
|
|
|
|
|
indexInfo = makeNode(IndexInfo);
|
|
|
|
indexInfo->ii_NumIndexAttrs = 2;
|
|
|
|
indexInfo->ii_KeyAttrNumbers[0] = 1;
|
|
|
|
indexInfo->ii_KeyAttrNumbers[1] = 2;
|
|
|
|
indexInfo->ii_Expressions = NIL;
|
|
|
|
indexInfo->ii_ExpressionsState = NIL;
|
|
|
|
indexInfo->ii_Predicate = NIL;
|
|
|
|
indexInfo->ii_PredicateState = NIL;
|
2009-12-07 06:22:23 +01:00
|
|
|
indexInfo->ii_ExclusionOps = NULL;
|
|
|
|
indexInfo->ii_ExclusionProcs = NULL;
|
|
|
|
indexInfo->ii_ExclusionStrats = NULL;
|
2006-07-31 03:16:38 +02:00
|
|
|
indexInfo->ii_Unique = true;
|
2007-09-20 19:56:33 +02:00
|
|
|
indexInfo->ii_ReadyForInserts = true;
|
2006-08-25 06:06:58 +02:00
|
|
|
indexInfo->ii_Concurrent = false;
|
2007-09-20 19:56:33 +02:00
|
|
|
indexInfo->ii_BrokenHotChain = false;
|
2006-07-31 03:16:38 +02:00
|
|
|
|
2011-02-08 22:04:18 +01:00
|
|
|
collationObjectId[0] = InvalidOid;
|
|
|
|
collationObjectId[1] = InvalidOid;
|
|
|
|
|
2006-07-31 03:16:38 +02:00
|
|
|
classObjectId[0] = OID_BTREE_OPS_OID;
|
|
|
|
classObjectId[1] = INT4_BTREE_OPS_OID;
|
|
|
|
|
2007-01-09 03:14:16 +01:00
|
|
|
coloptions[0] = 0;
|
|
|
|
coloptions[1] = 0;
|
|
|
|
|
2011-07-18 17:02:48 +02:00
|
|
|
index_create(toast_rel, toast_idxname, toastIndexOid, InvalidOid,
|
2011-06-09 20:32:50 +02:00
|
|
|
indexInfo,
|
|
|
|
list_make2("chunk_id", "chunk_seq"),
|
|
|
|
BTREE_AM_OID,
|
|
|
|
rel->rd_rel->reltablespace,
|
|
|
|
collationObjectId, classObjectId, coloptions, (Datum) 0,
|
|
|
|
true, false, false, false,
|
2012-10-23 23:07:26 +02:00
|
|
|
true, false, false, true);
|
2006-07-31 03:16:38 +02:00
|
|
|
|
2011-01-25 21:42:03 +01:00
|
|
|
heap_close(toast_rel, NoLock);
|
|
|
|
|
2006-07-31 03:16:38 +02:00
|
|
|
/*
|
|
|
|
* Store the toast table's OID in the parent relation's pg_class row
|
|
|
|
*/
|
|
|
|
class_rel = heap_open(RelationRelationId, RowExclusiveLock);
|
|
|
|
|
2010-02-14 19:42:19 +01:00
|
|
|
reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relOid));
|
2006-07-31 03:16:38 +02:00
|
|
|
if (!HeapTupleIsValid(reltup))
|
|
|
|
elog(ERROR, "cache lookup failed for relation %u", relOid);
|
|
|
|
|
|
|
|
((Form_pg_class) GETSTRUCT(reltup))->reltoastrelid = toast_relid;
|
|
|
|
|
|
|
|
if (!IsBootstrapProcessingMode())
|
|
|
|
{
|
|
|
|
/* normal case, use a transactional update */
|
|
|
|
simple_heap_update(class_rel, &reltup->t_self, reltup);
|
|
|
|
|
|
|
|
/* Keep catalog indexes current */
|
|
|
|
CatalogUpdateIndexes(class_rel, reltup);
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
/* While bootstrapping, we cannot UPDATE, so overwrite in-place */
|
|
|
|
heap_inplace_update(class_rel, reltup);
|
|
|
|
}
|
|
|
|
|
|
|
|
heap_freetuple(reltup);
|
|
|
|
|
|
|
|
heap_close(class_rel, RowExclusiveLock);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Register dependency from the toast table to the master, so that the
|
|
|
|
* toast table will be deleted if the master is. Skip this in bootstrap
|
|
|
|
* mode.
|
|
|
|
*/
|
|
|
|
if (!IsBootstrapProcessingMode())
|
|
|
|
{
|
|
|
|
baseobject.classId = RelationRelationId;
|
|
|
|
baseobject.objectId = relOid;
|
|
|
|
baseobject.objectSubId = 0;
|
|
|
|
toastobject.classId = RelationRelationId;
|
|
|
|
toastobject.objectId = toast_relid;
|
|
|
|
toastobject.objectSubId = 0;
|
|
|
|
|
|
|
|
recordDependencyOn(&toastobject, &baseobject, DEPENDENCY_INTERNAL);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Make changes visible
|
|
|
|
*/
|
|
|
|
CommandCounterIncrement();
|
|
|
|
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
2014-05-06 18:12:18 +02:00
|
|
|
* Check to see whether the table needs a TOAST table. It does only if
|
2006-07-31 03:16:38 +02:00
|
|
|
* (1) there are any toastable attributes, and (2) the maximum length
|
|
|
|
* of a tuple could exceed TOAST_TUPLE_THRESHOLD. (We don't want to
|
|
|
|
* create a toast table for something like "f1 varchar(20)".)
|
|
|
|
*/
|
|
|
|
static bool
|
|
|
|
needs_toast_table(Relation rel)
|
|
|
|
{
|
|
|
|
int32 data_length = 0;
|
|
|
|
bool maxlength_unknown = false;
|
|
|
|
bool has_toastable_attrs = false;
|
|
|
|
TupleDesc tupdesc;
|
|
|
|
Form_pg_attribute *att;
|
|
|
|
int32 tuple_length;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
tupdesc = rel->rd_att;
|
|
|
|
att = tupdesc->attrs;
|
|
|
|
|
|
|
|
for (i = 0; i < tupdesc->natts; i++)
|
|
|
|
{
|
|
|
|
if (att[i]->attisdropped)
|
|
|
|
continue;
|
2007-04-06 06:21:44 +02:00
|
|
|
data_length = att_align_nominal(data_length, att[i]->attalign);
|
2006-07-31 03:16:38 +02:00
|
|
|
if (att[i]->attlen > 0)
|
|
|
|
{
|
|
|
|
/* Fixed-length types are never toastable */
|
|
|
|
data_length += att[i]->attlen;
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
int32 maxlen = type_maximum_size(att[i]->atttypid,
|
|
|
|
att[i]->atttypmod);
|
|
|
|
|
|
|
|
if (maxlen < 0)
|
|
|
|
maxlength_unknown = true;
|
|
|
|
else
|
|
|
|
data_length += maxlen;
|
|
|
|
if (att[i]->attstorage != 'p')
|
|
|
|
has_toastable_attrs = true;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if (!has_toastable_attrs)
|
|
|
|
return false; /* nothing to toast? */
|
|
|
|
if (maxlength_unknown)
|
|
|
|
return true; /* any unlimited-length attrs? */
|
|
|
|
tuple_length = MAXALIGN(offsetof(HeapTupleHeaderData, t_bits) +
|
|
|
|
BITMAPLEN(tupdesc->natts)) +
|
|
|
|
MAXALIGN(data_length);
|
|
|
|
return (tuple_length > TOAST_TUPLE_THRESHOLD);
|
|
|
|
}
|