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Teach planner to expand sufficiently simple SQL-language functions

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('SELECT expression') inline, like macros, during the constant-folding
phase of planning.  The actual expansion is not difficult, but checking
that we're not changing the semantics of the call turns out to be more
subtle than one might think; in particular must pay attention to
permissions issues, strictness, and volatility.
This commit is contained in:
Tom Lane
2002-12-01 21:05:14 +00:00
parent 02f8c9a382
commit 8e3a87fbd4
4 changed files with 489 additions and 116 deletions
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3
src/include/optimizer/clauses.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: clauses.h,v 1.55 2002/11/06 22:31:24 tgl Exp $
* $Id: clauses.h,v 1.56 2002/12/01 21:05:14 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -51,6 +51,7 @@ extern void check_subplans_for_ungrouped_vars(Query *query);
extern bool contain_mutable_functions(Node *clause);
extern bool contain_volatile_functions(Node *clause);
extern bool contain_nonstrict_functions(Node *clause);
extern bool is_pseudo_constant_clause(Node *clause);
extern List *pull_constant_clauses(List *quals, List **constantQual);