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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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11
src/backend/commands/vacuumlazy.c
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@ -268,10 +268,10 @@ static void
vacuum_log_cleanup_info(Relation rel, LVRelStats *vacrelstats)
{
/*
* No need to log changes for temp tables, they do not contain data
* visible on the standby server.
* Skip this for relations for which no WAL is to be written, or if we're
* not trying to support archive recovery.
*/
if (rel->rd_istemp || !XLogIsNeeded())
if (!RelationNeedsWAL(rel) || !XLogIsNeeded())
return;
/*
@ -664,8 +664,7 @@ lazy_scan_heap(Relation onerel, LVRelStats *vacrelstats,
if (nfrozen > 0)
{
MarkBufferDirty(buf);
/* no XLOG for temp tables, though */
if (!onerel->rd_istemp)
if (RelationNeedsWAL(onerel))
{
XLogRecPtr recptr;
@ -895,7 +894,7 @@ lazy_vacuum_page(Relation onerel, BlockNumber blkno, Buffer buffer,
MarkBufferDirty(buffer);
/* XLOG stuff */
if (!onerel->rd_istemp)
if (RelationNeedsWAL(onerel))
{
XLogRecPtr recptr;