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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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4
src/backend/storage/buffer/bufmgr.c
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@ -123,7 +123,7 @@ PrefetchBuffer(Relation reln, ForkNumber forkNum, BlockNumber blockNum)
/* Open it at the smgr level if not already done */
RelationOpenSmgr(reln);
if (reln->rd_istemp)
if (RelationUsesLocalBuffers(reln))
{
/* see comments in ReadBufferExtended */
if (RELATION_IS_OTHER_TEMP(reln))
@ -2071,7 +2071,7 @@ FlushRelationBuffers(Relation rel)
/* Open rel at the smgr level if not already done */
RelationOpenSmgr(rel);
if (rel->rd_istemp)
if (RelationUsesLocalBuffers(rel))
{
for (i = 0; i < NLocBuffer; i++)
{