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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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30
src/backend/optimizer/util/relnode.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/util/relnode.c,v 1.29 2000/09/29 18:21:23 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/util/relnode.c,v 1.30 2000/11/12 00:36:59 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -45,7 +45,6 @@ get_base_rel(Query *root, int relid)
{
List *baserels;
RelOptInfo *rel;
Oid relationObjectId;
foreach(baserels, root->base_rel_list)
{
@ -60,7 +59,30 @@ get_base_rel(Query *root, int relid)
}
/* No existing RelOptInfo for this base rel, so make a new one */
rel = makeNode(RelOptInfo);
rel = make_base_rel(root, relid);
/* and add it to the list */
root->base_rel_list = lcons(rel, root->base_rel_list);
return rel;
}
/*
* make_base_rel
* Construct a base-relation RelOptInfo for the specified rangetable index.
*
* This is split out of get_base_rel so that inheritance-tree processing can
* construct baserel nodes for child tables. We need a RelOptInfo so we can
* plan a suitable access path for each child table, but we do NOT want to
* enter the child nodes into base_rel_list. In most contexts, get_base_rel
* should be called instead.
*/
RelOptInfo *
make_base_rel(Query *root, int relid)
{
RelOptInfo *rel = makeNode(RelOptInfo);
Oid relationObjectId;
rel->relids = makeListi1(relid);
rel->rows = 0;
rel->width = 0;
@ -95,8 +117,6 @@ get_base_rel(Query *root, int relid)
rel->issubquery = true;
}
root->base_rel_list = lcons(rel, root->base_rel_list);
return rel;
}