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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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9
src/include/optimizer/prep.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/optimizer/prep.h,v 1.54 2006/01/31 21:39:25 tgl Exp $
* $PostgreSQL: pgsql/src/include/optimizer/prep.h,v 1.55 2006/02/03 21:08:49 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -23,7 +23,7 @@
*/
extern Node *pull_up_IN_clauses(PlannerInfo *root, Node *node);
extern Node *pull_up_subqueries(PlannerInfo *root, Node *jtnode,
bool below_outer_join);
bool below_outer_join, bool append_rel_member);
extern void reduce_outer_joins(PlannerInfo *root);
extern Relids get_relids_in_jointree(Node *jtnode);
extern Relids get_relids_for_join(PlannerInfo *root, int joinrelid);
@@ -55,9 +55,4 @@ extern Relids *adjust_appendrel_attr_needed(RelOptInfo *oldrel,
AttrNumber new_min_attr,
AttrNumber new_max_attr);
extern Relids *adjust_other_rel_attr_needed(RelOptInfo *oldrel,
AppendRelInfo *appinfo,
AttrNumber new_min_attr,
AttrNumber new_max_attr);
#endif /* PREP_H */