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Make sure make_rels_by_clause_joins doesn't return multiple references

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to same joinrel.  Although make_rels_by_joins doesn't mind, GEQO has
an Assert that doesn't like this.
This commit is contained in:
Tom Lane 2000-12-18 06:50:51 +00:00
parent cf35a70495
commit 97cfb9d606
1 changed files with 23 additions and 7 deletions
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30
src/backend/optimizer/path/joinrels.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/path/joinrels.c,v 1.48 2000/09/29 18:21:32 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/path/joinrels.c,v 1.49 2000/12/18 06:50:51 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -262,9 +262,18 @@ make_rels_by_clause_joins(Query *root,
RelOptInfo *other_rel = (RelOptInfo *) lfirst(j);
if (is_subseti(unjoined_relids, other_rel->relids))
result = lcons(make_join_rel(root, old_rel, other_rel,
JOIN_INNER),
result);
{
RelOptInfo *jrel;
jrel = make_join_rel(root, old_rel, other_rel, JOIN_INNER);
/*
* Avoid entering same joinrel into our output list more
* than once. (make_rels_by_joins doesn't really care,
* but GEQO does.)
*/
if (!ptrMember(jrel, result))
result = lcons(jrel, result);
}
}
}
@ -297,9 +306,16 @@ make_rels_by_clauseless_joins(Query *root,
RelOptInfo *other_rel = (RelOptInfo *) lfirst(i);
if (nonoverlap_setsi(other_rel->relids, old_rel->relids))
result = lcons(make_join_rel(root, old_rel, other_rel,
JOIN_INNER),
result);
{
RelOptInfo *jrel;
jrel = make_join_rel(root, old_rel, other_rel, JOIN_INNER);
/*
* As long as given other_rels are distinct, don't need
* to test to see if jrel is already part of output list.
*/
result = lcons(jrel, result);
}
}
return result;