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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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20
src/backend/executor/functions.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/executor/functions.c,v 1.115 2007/04/16 01:14:56 tgl Exp $
* $PostgreSQL: pgsql/src/backend/executor/functions.c,v 1.116 2007/04/27 22:05:47 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -317,7 +317,7 @@ postquel_start(execution_state *es, SQLFunctionCachePtr fcache)
/* We assume we don't need to set up ActiveSnapshot for ExecutorStart */
/* Utility commands don't need Executor. */
if (es->qd->operation != CMD_UTILITY)
if (es->qd->utilitystmt == NULL)
{
/*
* Only set up to collect queued triggers if it's not a SELECT.
@ -346,9 +346,12 @@ postquel_getnext(execution_state *es, SQLFunctionCachePtr fcache)
{
ActiveSnapshot = es->qd->snapshot;
if (es->qd->operation == CMD_UTILITY)
if (es->qd->utilitystmt)
{
ProcessUtility(es->qd->utilitystmt,
/* ProcessUtility needs the PlannedStmt for DECLARE CURSOR */
ProcessUtility((es->qd->plannedstmt ?
(Node *) es->qd->plannedstmt :
es->qd->utilitystmt),
fcache->src,
es->qd->params,
false, /* not top level */
@ -366,7 +369,8 @@ postquel_getnext(execution_state *es, SQLFunctionCachePtr fcache)
*/
if (LAST_POSTQUEL_COMMAND(es) &&
es->qd->operation == CMD_SELECT &&
es->qd->plannedstmt->into == NULL)
es->qd->plannedstmt->utilityStmt == NULL &&
es->qd->plannedstmt->intoClause == NULL)
count = 1L;
else
count = 0L;
@ -396,7 +400,7 @@ postquel_end(execution_state *es)
es->status = F_EXEC_DONE;
/* Utility commands don't need Executor. */
if (es->qd->operation != CMD_UTILITY)
if (es->qd->utilitystmt == NULL)
{
/* Make our snapshot the active one for any called functions */
saveActiveSnapshot = ActiveSnapshot;
@ -894,7 +898,9 @@ check_sql_fn_retval(Oid func_id, Oid rettype, List *queryTreeList,
* Note: eventually replace this test with QueryReturnsTuples? We'd need
* a more general method of determining the output type, though.
*/
if (!(parse->commandType == CMD_SELECT && parse->into == NULL))
if (!(parse->commandType == CMD_SELECT &&
parse->utilityStmt == NULL &&
parse->intoClause == NULL))
{
if (rettype != VOIDOID)
ereport(ERROR,