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Rearrange top-level rewrite operations so that EXPLAIN works

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on queries involving UNION, EXCEPT, INTERSECT.
This commit is contained in:
Tom Lane
1999-05-09 23:31:47 +00:00
parent 6458daa180
commit 0b69d8a27c
3 changed files with 125 additions and 106 deletions
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19
src/backend/commands/explain.c
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@ -4,7 +4,7 @@
*
* Copyright (c) 1994-5, Regents of the University of California
*
* $Id: explain.c,v 1.35 1999/04/25 03:19:09 tgl Exp $
* $Id: explain.c,v 1.36 1999/05/09 23:31:45 tgl Exp $
*
*/
#include <stdio.h>
@ -49,15 +49,18 @@ ExplainQuery(Query *query, bool verbose, CommandDest dest)
List *rewritten;
List *l;
/* rewriter and planner may not work in aborted state? */
if (IsAbortedTransactionBlockState())
{
char *tag = "*ABORT STATE*";
EndCommand(tag, dest);
elog(NOTICE, "(transaction aborted): %s",
"queries ignored until END");
return;
}
/* rewriter and planner will not cope with utility statements */
if (query->commandType == CMD_UTILITY)
{
elog(NOTICE, "Utility statements have no plan structure");
return;
}
@ -67,7 +70,7 @@ ExplainQuery(Query *query, bool verbose, CommandDest dest)
/* In the case of an INSTEAD NOTHING, tell at least that */
if (rewritten == NIL)
{
elog(NOTICE, "query rewrites to nothing");
elog(NOTICE, "Query rewrites to nothing");
return;
}
@ -88,7 +91,7 @@ ExplainOneQuery(Query *query, bool verbose, CommandDest dest)
Plan *plan;
ExplainState *es;
/* plan the queries (XXX we've ignored rewrite!!) */
/* plan the query */
plan = planner(query);
/* pg_plan could have failed */
@ -195,7 +198,7 @@ explain_outNode(StringInfo str, Plan *plan, int indent, ExplainState *es)
pname = "Hash";
break;
default:
pname = "";
pname = "???";
break;
}