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Create a standardized expression_tree_mutator support routine

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to go along with expression_tree_walker.  (_walker is not suitable for
routines that need to alter the tree structure significantly.)  Other minor
cleanups in clauses.c.
This commit is contained in:
Tom Lane
1999-08-09 00:51:26 +00:00
parent f0b651ac6b
commit 6bc601b648
3 changed files with 281 additions and 52 deletions
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5
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 1.24 1999/07/27 03:51:00 tgl Exp $
* $Id: clauses.h,v 1.25 1999/08/09 00:51:23 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -44,7 +44,6 @@ extern void clause_get_relids_vars(Node *clause, Relids *relids, List **vars);
extern int NumRelids(Node *clause);
extern bool is_joinable(Node *clause);
extern bool qual_clause_p(Node *clause);
extern void fix_opid(Node *clause);
extern List *fix_opids(List *clauses);
extern void get_relattval(Node *clause, int targetrelid,
int *relid, AttrNumber *attno,
@@ -55,6 +54,8 @@ extern void CommuteClause(Node *clause);
extern bool expression_tree_walker(Node *node, bool (*walker) (),
void *context);
extern Node *expression_tree_mutator(Node *node, Node * (*mutator) (),
void *context);
#define is_subplan(clause) ((Node*) (clause) != NULL && \
nodeTag((Node*) (clause)) == T_Expr && \