database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-08-19 23:22:23 +03:00
Code Activity

Generalize concept of temporary relations to "relation persistence".

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

28
src/backend/utils/adt/dbsize.c
View File

@@ -612,16 +612,26 @@ pg_relation_filepath(PG_FUNCTION_ARGS)
PG_RETURN_NULL();
}
/* If temporary, determine owning backend. */
if (!relform->relistemp)
backend = InvalidBackendId;
else if (isTempOrToastNamespace(relform->relnamespace))
backend = MyBackendId;
else
/* Determine owning backend. */
switch (relform->relpersistence)
{
/* Do it the hard way. */
backend = GetTempNamespaceBackendId(relform->relnamespace);
Assert(backend != InvalidBackendId);
case RELPERSISTENCE_PERMANENT:
backend = InvalidBackendId;
break;
case RELPERSISTENCE_TEMP:
if (isTempOrToastNamespace(relform->relnamespace))
backend = MyBackendId;
else
{
/* Do it the hard way. */
backend = GetTempNamespaceBackendId(relform->relnamespace);
Assert(backend != InvalidBackendId);
}
break;
default:
elog(ERROR, "invalid relpersistence: %c", relform->relpersistence);
backend = InvalidBackendId; /* placate compiler */
break;
}
ReleaseSysCache(tuple);