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Allow row comparisons to be used as indexscan qualifications.

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This completes the project to upgrade our handling of row comparisons.
This commit is contained in:
Tom Lane
2006-01-25 20:29:24 +00:00
parent 06d45e485d
commit 3a0a16cb7e
11 changed files with 996 additions and 142 deletions
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41
src/backend/optimizer/plan/createplan.c
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@@ -10,7 +10,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/plan/createplan.c,v 1.205 2005/11/26 22:14:56 tgl Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/plan/createplan.c,v 1.206 2006/01/25 20:29:23 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -1583,7 +1583,7 @@ fix_indexqual_references(List *indexquals, IndexPath *index_path,
* (only) the base relation.
*/
if (!bms_equal(rinfo->left_relids, index->rel->relids))
CommuteClause(op);
CommuteOpExpr(op);
/*
* Now, determine which index attribute this is, change the
@@ -1594,6 +1594,41 @@ fix_indexqual_references(List *indexquals, IndexPath *index_path,
&opclass);
clause_op = op->opno;
}
else if (IsA(clause, RowCompareExpr))
{
RowCompareExpr *rc = (RowCompareExpr *) clause;
ListCell *lc;
/*
* Check to see if the indexkey is on the right; if so, commute
* the clause. The indexkey should be the side that refers to
* (only) the base relation.
*/
if (!bms_overlap(pull_varnos(linitial(rc->largs)),
index->rel->relids))
CommuteRowCompareExpr(rc);
/*
* For each column in the row comparison, determine which index
* attribute this is and change the indexkey operand as needed.
*
* Save the index opclass for only the first column. We will
* return the operator and opclass info for just the first
* column of the row comparison; the executor will have to
* look up the rest if it needs them.
*/
foreach(lc, rc->largs)
{
Oid tmp_opclass;
lfirst(lc) = fix_indexqual_operand(lfirst(lc),
index,
&tmp_opclass);
if (lc == list_head(rc->largs))
opclass = tmp_opclass;
}
clause_op = linitial_oid(rc->opnos);
}
else if (IsA(clause, ScalarArrayOpExpr))
{
ScalarArrayOpExpr *saop = (ScalarArrayOpExpr *) clause;
@@ -1745,7 +1780,7 @@ get_switched_clauses(List *clauses, Relids outerrelids)
temp->opretset = clause->opretset;
temp->args = list_copy(clause->args);
/* Commute it --- note this modifies the temp node in-place. */
CommuteClause(temp);
CommuteOpExpr(temp);
t_list = lappend(t_list, temp);
}
else