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Restructure handling of inheritance queries so that they work with outer

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joins, and clean things up a good deal at the same time.  Append plan node
no longer hacks on rangetable at runtime --- instead, all child tables are
given their own RT entries during planning.  Concept of multiple target
tables pushed up into execMain, replacing bug-prone implementation within
nodeAppend.  Planner now supports generating Append plans for inheritance
sets either at the top of the plan (the old way) or at the bottom.  Expanding
at the bottom is appropriate for tables used as sources, since they may
appear inside an outer join; but we must still expand at the top when the
target of an UPDATE or DELETE is an inheritance set, because we actually need
a different targetlist and junkfilter for each target table in that case.
Fortunately a target table can't be inside an outer join...  Bizarre mutual
recursion between union_planner and prepunion.c is gone --- in fact,
union_planner doesn't really have much to do with union queries anymore,
so I renamed it grouping_planner.
This commit is contained in:
Tom Lane
2000-11-12 00:37:02 +00:00
parent 609f9199af
commit 6543d81d65
37 changed files with 1258 additions and 1253 deletions
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4
src/include/optimizer/pathnode.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: pathnode.h,v 1.30 2000/10/05 19:48:33 momjian Exp $
* $Id: pathnode.h,v 1.31 2000/11/12 00:37:01 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -32,6 +32,7 @@ extern IndexPath *create_index_path(Query *root, RelOptInfo *rel,
List *restriction_clauses,
ScanDirection indexscandir);
extern TidPath *create_tidscan_path(RelOptInfo *rel, List *tideval);
extern AppendPath *create_append_path(RelOptInfo *rel, List *subpaths);
extern Path *create_subqueryscan_path(RelOptInfo *rel);
extern NestPath *create_nestloop_path(RelOptInfo *joinrel,
@@ -63,6 +64,7 @@ extern HashPath *create_hashjoin_path(RelOptInfo *joinrel,
* prototypes for relnode.c
*/
extern RelOptInfo *get_base_rel(Query *root, int relid);
extern RelOptInfo *make_base_rel(Query *root, int relid);
extern RelOptInfo *get_join_rel(Query *root, RelOptInfo *outer_rel,
RelOptInfo *inner_rel,
List **restrictlist_ptr);

4
src/include/optimizer/planmain.h
View File

@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: planmain.h,v 1.47 2000/10/26 21:38:24 tgl Exp $
* $Id: planmain.h,v 1.48 2000/11/12 00:37:01 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -28,6 +28,7 @@ extern Plan *query_planner(Query *root, List *tlist, double tuple_fraction);
extern Plan *create_plan(Query *root, Path *best_path);
extern SubqueryScan *make_subqueryscan(List *qptlist, List *qpqual,
Index scanrelid, Plan *subplan);
extern Append *make_append(List *appendplans, bool isTarget, List *tlist);
extern Sort *make_sort(List *tlist, Plan *lefttree, int keycount);
extern Sort *make_sort_from_pathkeys(List *tlist, Plan *lefttree,
List *pathkeys);
@@ -41,7 +42,6 @@ extern Limit *make_limit(List *tlist, Plan *lefttree,
extern SetOp *make_setop(SetOpCmd cmd, List *tlist, Plan *lefttree,
List *distinctList, AttrNumber flagColIdx);
extern Result *make_result(List *tlist, Node *resconstantqual, Plan *subplan);
extern void copy_plan_costsize(Plan *dest, Plan *src);
/*
* prototypes for plan/initsplan.c

3
src/include/optimizer/planner.h
View File

@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: planner.h,v 1.17 2000/10/05 19:11:37 tgl Exp $
* $Id: planner.h,v 1.18 2000/11/12 00:37:01 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -20,7 +20,6 @@
extern Plan *planner(Query *parse);
extern Plan *subquery_planner(Query *parse, double tuple_fraction);
extern Plan *union_planner(Query *parse, double tuple_fraction);
extern Plan *make_sortplan(List *tlist, Plan *plannode, List *sortcls);

12
src/include/optimizer/prep.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: prep.h,v 1.24 2000/10/05 19:11:37 tgl Exp $
* $Id: prep.h,v 1.25 2000/11/12 00:37:01 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -33,10 +33,12 @@ extern List *preprocess_targetlist(List *tlist, int command_type,
* prototypes for prepunion.c
*/
extern Plan *plan_set_operations(Query *parse);
extern List *find_all_inheritors(Oid parentrel);
extern bool find_inheritable_rt_entry(List *rangetable,
Index *rt_index, List **inheritors);
extern Plan *plan_inherit_queries(Query *root, List *tlist,
Index rt_index, List *inheritors);
extern List *expand_inherted_rtentry(Query *parse, Index rti);
extern Node *adjust_inherited_attrs(Node *node,
Index old_rt_index, Oid old_relid,
Index new_rt_index, Oid new_relid);
#endif /* PREP_H */