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Modify processing of DECLARE CURSOR and EXPLAIN so that they can resolve the

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types of unspecified parameters when submitted via extended query protocol.
This worked in 8.2 but I had broken it during plancache changes.  DECLARE
CURSOR is now treated almost exactly like a plain SELECT through parse
analysis, rewrite, and planning; only just before sending to the executor
do we divert it away to ProcessUtility.  This requires a special-case check
in a number of places, but practically all of them were already special-casing
SELECT INTO, so it's not too ugly.  (Maybe it would be a good idea to merge
the two by treating IntoClause as a form of utility statement?  Not going to
worry about that now, though.)  That approach doesn't work for EXPLAIN,
however, so for that I punted and used a klugy solution of running parse
analysis an extra time if under extended query protocol.
This commit is contained in:
Tom Lane
2007-04-27 22:05:49 +00:00
parent a264671116
commit bbbe825f5f
26 changed files with 333 additions and 246 deletions
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8
src/backend/optimizer/prep/prepjointree.c
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@@ -15,7 +15,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/prep/prepjointree.c,v 1.47 2007/02/19 07:03:30 tgl Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/prep/prepjointree.c,v 1.48 2007/04/27 22:05:47 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -627,7 +627,8 @@ is_simple_subquery(Query *subquery)
*/
if (!IsA(subquery, Query) ||
subquery->commandType != CMD_SELECT ||
subquery->into != NULL)
subquery->utilityStmt != NULL ||
subquery->intoClause != NULL)
elog(ERROR, "subquery is bogus");
/*
@@ -698,7 +699,8 @@ is_simple_union_all(Query *subquery)
/* Let's just make sure it's a valid subselect ... */
if (!IsA(subquery, Query) ||
subquery->commandType != CMD_SELECT ||
subquery->into != NULL)
subquery->utilityStmt != NULL ||
subquery->intoClause != NULL)
elog(ERROR, "subquery is bogus");
/* Is it a set-operation query at all? */