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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/access/nbtree/nbtpage.c
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@@ -224,7 +224,7 @@ _bt_getroot(Relation rel, int access)
MarkBufferDirty(metabuf);
/* XLOG stuff */
if (!rel->rd_istemp)
if (RelationNeedsWAL(rel))
{
xl_btree_newroot xlrec;
XLogRecPtr recptr;
@@ -452,7 +452,7 @@ _bt_checkpage(Relation rel, Buffer buf)
static void
_bt_log_reuse_page(Relation rel, BlockNumber blkno, TransactionId latestRemovedXid)
{
if (rel->rd_istemp)
if (!RelationNeedsWAL(rel))
return;
/* No ereport(ERROR) until changes are logged */
@@ -751,7 +751,7 @@ _bt_delitems_vacuum(Relation rel, Buffer buf,
MarkBufferDirty(buf);
/* XLOG stuff */
if (!rel->rd_istemp)
if (RelationNeedsWAL(rel))
{
XLogRecPtr recptr;
XLogRecData rdata[2];
@@ -829,7 +829,7 @@ _bt_delitems_delete(Relation rel, Buffer buf,
MarkBufferDirty(buf);
/* XLOG stuff */
if (!rel->rd_istemp)
if (RelationNeedsWAL(rel))
{
XLogRecPtr recptr;
XLogRecData rdata[3];
@@ -1365,7 +1365,7 @@ _bt_pagedel(Relation rel, Buffer buf, BTStack stack)
MarkBufferDirty(lbuf);
/* XLOG stuff */
if (!rel->rd_istemp)
if (RelationNeedsWAL(rel))
{
xl_btree_delete_page xlrec;
xl_btree_metadata xlmeta;