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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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5
src/backend/parser/parse_expr.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/parser/parse_expr.c,v 1.216 2007/04/02 03:49:39 tgl Exp $
* $PostgreSQL: pgsql/src/backend/parser/parse_expr.c,v 1.217 2007/04/27 22:05:48 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -1117,7 +1117,8 @@ transformSubLink(ParseState *pstate, SubLink *sublink)
elog(ERROR, "bad query in sub-select");
qtree = (Query *) linitial(qtrees);
if (qtree->commandType != CMD_SELECT ||
qtree->into != NULL)
qtree->utilityStmt != NULL ||
qtree->intoClause != NULL)
elog(ERROR, "bad query in sub-select");
sublink->subselect = (Node *) qtree;