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Rethink the order of expression preprocessing: eval_const_expressions

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really ought to run before canonicalize_qual, because it can now produce
forms that canonicalize_qual knows how to improve (eg, NOT clauses).
Also, because eval_const_expressions already knows about flattening
nested ANDs and ORs into N-argument form, the initial flatten_andors
pass in canonicalize_qual is now completely redundant and can be
removed.  This doesn't save a whole lot of code, but the time and
palloc traffic eliminated is a useful gain on large expression trees.
This commit is contained in:
Tom Lane
2005-03-28 00:58:26 +00:00
parent bf3dbb5881
commit 5db2e83852
7 changed files with 61 additions and 140 deletions
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3
src/include/optimizer/prep.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/optimizer/prep.h,v 1.48 2005/03/17 23:45:09 neilc Exp $
* $PostgreSQL: pgsql/src/include/optimizer/prep.h,v 1.49 2005/03/28 00:58:26 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -37,7 +37,6 @@ extern Relids get_relids_for_join(Query *parse, int joinrelid);
* prototypes for prepqual.c
*/
extern Expr *canonicalize_qual(Expr *qual);
extern Node *flatten_andors(Node *node);
/*
* prototypes for preptlist.c