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Teach planner to convert simple UNION ALL subqueries into append relations,

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thereby sharing code with the inheritance case.  This puts the UNION-ALL-view
approach to partitioned tables on par with inheritance, so far as constraint
exclusion is concerned: it works either way.  (Still need to update the docs
to say so.)  The definition of "simple UNION ALL" is a little simpler than
I would like --- basically the union arms can only be SELECT * FROM foo
--- but it's good enough for partitioned-table cases.
This commit is contained in:
Tom Lane
2006-02-03 21:08:49 +00:00
parent a25b1decef
commit 8b109ebf14
10 changed files with 888 additions and 388 deletions
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4
src/backend/optimizer/plan/planner.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/plan/planner.c,v 1.197 2006/01/31 21:39:24 tgl Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/plan/planner.c,v 1.198 2006/02/03 21:08:49 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -222,7 +222,7 @@ subquery_planner(Query *parse, double tuple_fraction,
* this query.
*/
parse->jointree = (FromExpr *)
pull_up_subqueries(root, (Node *) parse->jointree, false);
pull_up_subqueries(root, (Node *) parse->jointree, false, false);
/*
* Detect whether any rangetable entries are RTE_JOIN kind; if not, we can