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Major planner/optimizer revision: get rid of PathOrder node type,

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store all ordering information in pathkeys lists (which are now lists of
lists of PathKeyItem nodes, not just lists of lists of vars).  This was
a big win --- the code is smaller and IMHO more understandable than it
was, even though it handles more cases.  I believe the node changes will
not force an initdb for anyone; planner nodes don't show up in stored
rules.
This commit is contained in:
Tom Lane
1999-08-16 02:17:58 +00:00
parent 08320bfb22
commit e6381966c1
43 changed files with 1937 additions and 3270 deletions
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25
src/backend/optimizer/prep/prepunion.c
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@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/prep/prepunion.c,v 1.37 1999/07/17 20:17:17 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/prep/prepunion.c,v 1.38 1999/08/16 02:17:55 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -318,34 +318,29 @@ find_all_inheritors(Relids unexamined_relids,
Relids examined_relids)
{
List *new_inheritors = NIL;
List *new_examined_relids = NIL;
List *new_unexamined_relids = NIL;
List *new_examined_relids;
List *new_unexamined_relids;
List *rels;
/*
* Find all relations which inherit from members of
* 'unexamined_relids' and store them in 'new_inheritors'.
*/
List *rels = NIL;
List *newrels = NIL;
foreach(rels, unexamined_relids)
{
newrels = (List *) LispUnioni(find_inheritance_children(lfirsti(rels)),
newrels);
new_inheritors = LispUnioni(new_inheritors,
find_inheritance_children(lfirsti(rels)));
}
new_inheritors = newrels;
new_examined_relids = (List *) LispUnioni(examined_relids, unexamined_relids);
new_examined_relids = LispUnioni(examined_relids, unexamined_relids);
new_unexamined_relids = set_differencei(new_inheritors,
new_examined_relids);
if (new_unexamined_relids == NULL)
if (new_unexamined_relids == NIL)
return new_examined_relids;
else
{
return (find_all_inheritors(new_unexamined_relids,
new_examined_relids));
}
return find_all_inheritors(new_unexamined_relids,
new_examined_relids);
}
/*