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Try to exclude partitioned tables in toto.

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Ashutosh Bapat, reviewed by Jeevan Chalke.  Comment by me.

Discussion: http://postgr.es/m/CAFjFpRcuRaydz88CY_aQekmuvmN2A9ax5z0k=ppT+s8KS8xMRA@mail.gmail.com
This commit is contained in:
Robert Haas 2017-12-01 10:58:08 -05:00
parent 59c8078744
commit 1cbc17aaca
1 changed files with 12 additions and 2 deletions
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14
src/backend/optimizer/util/plancat.c
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@ -1414,8 +1414,18 @@ relation_excluded_by_constraints(PlannerInfo *root,
if (predicate_refuted_by(safe_restrictions, safe_restrictions, false))
return true;
/* Only plain relations have constraints */
if (rte->rtekind != RTE_RELATION || rte->inh)
/*
* Only plain relations have constraints. In a partitioning hierarchy,
* but not with regular table inheritance, it's OK to assume that any
* constraints that hold for the parent also hold for every child; for
* instance, table inheritance allows the parent to have constraints
* marked NO INHERIT, but table partitioning does not. We choose to check
* whether the partitioning parents can be excluded here; doing so
* consumes some cycles, but potentially saves us the work of excluding
* each child individually.
*/
if (rte->rtekind != RTE_RELATION ||
(rte->inh && rte->relkind != RELKIND_PARTITIONED_TABLE))
return false;
/*