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Further planner/optimizer cleanups. Move all set_tlist_references

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and fix_opids processing to a single recursive pass over the plan tree
executed at the very tail end of planning, rather than haphazardly here
and there at different places.  Now that tlist Vars do not get modified
until the very end, it's possible to get rid of the klugy var_equal and
match_varid partial-matching routines, and just use plain equal()
throughout the optimizer.  This is a step towards allowing merge and
hash joins to be done on expressions instead of only Vars ...
This commit is contained in:
Tom Lane
1999-08-22 20:15:04 +00:00
parent db436adf76
commit 78114cd4d4
24 changed files with 662 additions and 963 deletions
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14
src/include/optimizer/tlist.h
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@@ -6,7 +6,7 @@
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: tlist.h,v 1.21 1999/08/21 03:49:15 tgl Exp $
* $Id: tlist.h,v 1.22 1999/08/22 20:14:57 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -15,20 +15,16 @@
#include "nodes/relation.h"
extern TargetEntry *tlistentry_member(Var *var, List *targetlist);
extern Expr *matching_tlist_var(Var *var, List *targetlist);
extern TargetEntry *tlistentry_member(Node *node, List *targetlist);
extern Node *matching_tlist_expr(Node *node, List *targetlist);
extern Resdom *tlist_member(Node *node, List *targetlist);
extern void add_var_to_tlist(RelOptInfo *rel, Var *var);
extern TargetEntry *create_tl_element(Var *var, int resdomno);
extern List *get_actual_tlist(List *tlist);
extern Resdom *tlist_member(Var *var, List *tlist);
extern TargetEntry *match_varid(Var *test_var, List *tlist);
extern List *new_unsorted_tlist(List *targetlist);
extern List *copy_vars(List *target, List *source);
extern List *flatten_tlist(List *tlist);
extern List *add_to_flat_tlist(List *tlist, List *vars);
extern List *unflatten_tlist(List *full_tlist,
List *flat_tlist);
extern Var *get_expr(TargetEntry *tle);
extern Node *get_sortgroupclause_expr(SortClause *sortClause,