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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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8
src/backend/commands/tablespace.c
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@@ -1050,8 +1050,8 @@ assign_default_tablespace(const char *newval, bool doit, GucSource source)
/*
* GetDefaultTablespace -- get the OID of the current default tablespace
*
* Regular objects and temporary objects have different default tablespaces,
* hence the forTemp parameter must be specified.
* Temporary objects have different default tablespaces, hence the
* relpersistence parameter must be specified.
*
* May return InvalidOid to indicate "use the database's default tablespace".
*
@@ -1062,12 +1062,12 @@ assign_default_tablespace(const char *newval, bool doit, GucSource source)
* default_tablespace GUC variable.
*/
Oid
GetDefaultTablespace(bool forTemp)
GetDefaultTablespace(char relpersistence)
{
Oid result;
/* The temp-table case is handled elsewhere */
if (forTemp)
if (relpersistence == RELPERSISTENCE_TEMP)
{
PrepareTempTablespaces();
return GetNextTempTableSpace();