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Arrange for SET LOCAL's effects to persist until the end of the current top

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transaction, unless rolled back or overridden by a SET clause for the same
variable attached to a surrounding function call.  Per discussion, these
seem the best semantics.  Note that this is an INCOMPATIBLE CHANGE: in 8.0
through 8.2, SET LOCAL's effects disappeared at subtransaction commit
(leading to behavior that made little sense at the SQL level).

I took advantage of the opportunity to rewrite and simplify the GUC variable
save/restore logic a little bit.  The old idea of a "tentative" value is gone;
it was a hangover from before we had a stack.  Also, we no longer need a stack
entry for every nesting level, but only for those in which a variable's value
actually changed.
This commit is contained in:
Tom Lane
2007-09-11 00:06:42 +00:00
parent b366562e43
commit 82a47982f3
16 changed files with 814 additions and 510 deletions
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4
src/backend/utils/init/postinit.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/init/postinit.c,v 1.177 2007/09/03 00:39:18 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/init/postinit.c,v 1.178 2007/09/11 00:06:42 tgl Exp $
*
*
*-------------------------------------------------------------------------
@ -255,7 +255,7 @@ CheckMyDatabase(const char *name, bool am_superuser)
* right to insert an option into pg_database was checked when it
* was inserted.
*/
ProcessGUCArray(a, PGC_SUSET, PGC_S_DATABASE, false);
ProcessGUCArray(a, PGC_SUSET, PGC_S_DATABASE, GUC_ACTION_SET);
}
}