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Change EXPLAIN output so that subplans and initplans (particularly CTEs)

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are individually labeled, rather than just grouped under an "InitPlan"
or "SubPlan" heading.  This in turn makes it possible for decompilation of
a subplan reference to usefully identify which subplan it's referencing.
I also made InitPlans identify which parameter symbol(s) they compute,
so that references to those parameters elsewhere in the plan tree can
be connected to the initplan that will be executed.  Per a gripe from
Robert Haas about EXPLAIN output of a WITH query being inadequate,
plus some longstanding pet peeves of my own.
This commit is contained in:
Tom Lane
2009-04-05 19:59:40 +00:00
parent 329a5322e9
commit fbcce08046
7 changed files with 82 additions and 22 deletions
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3
src/backend/nodes/outfuncs.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/nodes/outfuncs.c,v 1.357 2009/04/04 21:12:31 tgl Exp $
* $PostgreSQL: pgsql/src/backend/nodes/outfuncs.c,v 1.358 2009/04/05 19:59:40 tgl Exp $
*
* NOTES
* Every node type that can appear in stored rules' parsetrees *must*
@ -961,6 +961,7 @@ _outSubPlan(StringInfo str, SubPlan *node)
WRITE_NODE_FIELD(testexpr);
WRITE_NODE_FIELD(paramIds);
WRITE_INT_FIELD(plan_id);
WRITE_STRING_FIELD(plan_name);
WRITE_OID_FIELD(firstColType);
WRITE_INT_FIELD(firstColTypmod);
WRITE_BOOL_FIELD(useHashTable);