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Generalize concept of temporary relations to "relation persistence".

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This commit replaces pg_class.relistemp with pg_class.relpersistence;
and also modifies the RangeVar node type to carry relpersistence rather
than istemp.  It also removes removes rd_istemp from RelationData and
instead performs the correct computation based on relpersistence.

For clarity, we add three new macros: RelationNeedsWAL(),
RelationUsesLocalBuffers(), and RelationUsesTempNamespace(), so that we
can clarify the purpose of each check that previous depended on
rd_istemp.

This is intended as infrastructure for the upcoming unlogged tables
patch, as well as for future possible work on global temporary tables.
This commit is contained in:
Robert Haas
2010-12-13 12:34:26 -05:00
parent 0c90442355
commit 5f7b58fad8
48 changed files with 334 additions and 230 deletions
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10
src/backend/catalog/index.c
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@@ -545,6 +545,7 @@ index_create(Oid heapRelationId,
bool is_exclusion;
Oid namespaceId;
int i;
char relpersistence;
is_exclusion = (indexInfo->ii_ExclusionOps != NULL);
@@ -561,11 +562,13 @@ index_create(Oid heapRelationId,
/*
* The index will be in the same namespace as its parent table, and is
* shared across databases if and only if the parent is. Likewise, it
* will use the relfilenode map if and only if the parent does.
* will use the relfilenode map if and only if the parent does; and it
* inherits the parent's relpersistence.
*/
namespaceId = RelationGetNamespace(heapRelation);
shared_relation = heapRelation->rd_rel->relisshared;
mapped_relation = RelationIsMapped(heapRelation);
relpersistence = heapRelation->rd_rel->relpersistence;
/*
* check parameters
@@ -646,9 +649,7 @@ index_create(Oid heapRelationId,
else
{
indexRelationId =
GetNewRelFileNode(tableSpaceId, pg_class,
heapRelation->rd_istemp ?
MyBackendId : InvalidBackendId);
GetNewRelFileNode(tableSpaceId, pg_class, relpersistence);
}
}
@@ -663,6 +664,7 @@ index_create(Oid heapRelationId,
indexRelationId,
indexTupDesc,
RELKIND_INDEX,
relpersistence,
shared_relation,
mapped_relation,
allow_system_table_mods);