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Clean up optimizer's handling of indexscan quals that need to be

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commuted (ie, the index var appears on the right).  These are now handled
the same way as merge and hash join quals that need to be commuted: the
actual reversing of the clause only happens if we actually choose the path
and generate a plan from it.  Furthermore, the clause is only reversed in
the 'indexqual' field of the plan, not in the 'indxqualorig' field.  This
allows the clause to still be recognized and removed from qpquals of upper
level join plans.  Also, simplify and generalize match_clause_to_indexkey;
now it recognizes binary-compatible indexes for join as well as restriction
clauses.
This commit is contained in:
Tom Lane
1999-08-12 04:32:54 +00:00
parent aae034d28c
commit 8f9f6e51a8
4 changed files with 263 additions and 244 deletions
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4
src/include/optimizer/clauses.h
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@@ -6,7 +6,7 @@
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: clauses.h,v 1.26 1999/08/10 03:00:12 tgl Exp $
* $Id: clauses.h,v 1.27 1999/08/12 04:32:49 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -47,7 +47,7 @@ extern void get_relattval(Node *clause, int targetrelid,
Datum *constval, int *flag);
extern void get_rels_atts(Node *clause, int *relid1,
AttrNumber *attno1, int *relid2, AttrNumber *attno2);
extern void CommuteClause(Node *clause);
extern void CommuteClause(Expr *clause);
extern bool expression_tree_walker(Node *node, bool (*walker) (),
void *context);