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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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19
src/backend/tcop/pquery.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/tcop/pquery.c,v 1.115 2007/03/13 00:33:42 tgl Exp $
* $PostgreSQL: pgsql/src/backend/tcop/pquery.c,v 1.116 2007/04/27 22:05:49 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -68,7 +68,7 @@ CreateQueryDesc(PlannedStmt *plannedstmt,
qd->operation = plannedstmt->commandType; /* operation */
qd->plannedstmt = plannedstmt; /* plan */
qd->utilitystmt = NULL;
qd->utilitystmt = plannedstmt->utilityStmt; /* in case DECLARE CURSOR */
qd->snapshot = snapshot; /* snapshot */
qd->crosscheck_snapshot = crosscheck_snapshot; /* RI check snapshot */
qd->dest = dest; /* output dest */
@ -257,7 +257,8 @@ ChoosePortalStrategy(List *stmts)
if (query->canSetTag)
{
if (query->commandType == CMD_SELECT &&
query->into == NULL)
query->utilityStmt == NULL &&
query->intoClause == NULL)
return PORTAL_ONE_SELECT;
if (query->commandType == CMD_UTILITY &&
query->utilityStmt != NULL)
@ -276,7 +277,8 @@ ChoosePortalStrategy(List *stmts)
if (pstmt->canSetTag)
{
if (pstmt->commandType == CMD_SELECT &&
pstmt->into == NULL)
pstmt->utilityStmt == NULL &&
pstmt->intoClause == NULL)
return PORTAL_ONE_SELECT;
}
}
@ -380,7 +382,8 @@ FetchStatementTargetList(Node *stmt)
else
{
if (query->commandType == CMD_SELECT &&
query->into == NULL)
query->utilityStmt == NULL &&
query->intoClause == NULL)
return query->targetList;
if (query->returningList)
return query->returningList;
@ -392,7 +395,8 @@ FetchStatementTargetList(Node *stmt)
PlannedStmt *pstmt = (PlannedStmt *) stmt;
if (pstmt->commandType == CMD_SELECT &&
pstmt->into == NULL)
pstmt->utilityStmt == NULL &&
pstmt->intoClause == NULL)
return pstmt->planTree->targetlist;
if (pstmt->returningLists)
return (List *) linitial(pstmt->returningLists);
@ -1222,7 +1226,8 @@ PortalRunMulti(Portal portal, bool isTopLevel,
*/
CHECK_FOR_INTERRUPTS();
if (IsA(stmt, PlannedStmt))
if (IsA(stmt, PlannedStmt) &&
((PlannedStmt *) stmt)->utilityStmt == NULL)
{
/*
* process a plannable query.