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Support for subselects.

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This commit is contained in:
Vadim B. Mikheev 1998-02-13 03:40:23 +00:00
parent 9184073324
commit e51c674c59
3 changed files with 42 additions and 22 deletions
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32
src/backend/optimizer/util/clauses.c
View File

@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/util/clauses.c,v 1.14 1998/01/20 22:11:39 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/util/clauses.c,v 1.15 1998/02/13 03:40:19 vadim Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
@ -22,6 +22,7 @@
#include "nodes/primnodes.h"
#include "nodes/relation.h"
#include "nodes/parsenodes.h"
#include "nodes/plannodes.h"
#include "nodes/makefuncs.h"
#include "nodes/nodeFuncs.h"
@ -57,6 +58,7 @@ make_clause(int type, Node *oper, List *args)
}
else
{
elog (ERROR, "make_clause: unsupported type %d", type);
/* will this ever happen? translated from lispy C code - ay 10/94 */
return ((Expr *) args);
}
@ -375,10 +377,10 @@ clause_relids_vars(Node *clause, List **relids, List **vars)
foreach(vi, var_list)
{
Var *in_list = (Var *) lfirst(vi);
Assert (var->varlevelsup == 0);
if (in_list->varno == var->varno &&
in_list->varattno == var->varattno &&
in_list->varlevelsup == var->varlevelsup)
in_list->varattno == var->varattno)
break;
}
if (vi == NIL)
@ -492,6 +494,7 @@ qual_clause_p(Node *clause)
if (!is_opclause(clause))
return false;
/* How about Param-s ? - vadim 02/03/98 */
if (IsA(get_leftop((Expr *) clause), Var) &&
IsA(get_rightop((Expr *) clause), Const))
{
@ -550,6 +553,17 @@ fix_opid(Node *clause)
{
fix_opid(((Aggreg *) clause)->target);
}
else if (is_subplan(clause) &&
((SubPlan*) ((Expr*) clause)->oper)->sublink->subLinkType != EXISTS_SUBLINK)
{
List *lst;
foreach (lst, ((SubPlan*) ((Expr*) clause)->oper)->sublink->oper)
{
replace_opid((Oper*) ((Expr*) lfirst(lst))->oper);
fix_opid((Node*) get_leftop((Expr*) lfirst(lst)));
}
}
}
@ -627,16 +641,13 @@ get_relattval(Node *clause,
*flag = (_SELEC_CONSTANT_RIGHT_ | _SELEC_NOT_CONSTANT_);
}
#ifdef INDEXSCAN_PATCH
}
else if (is_opclause(clause) && IsA(left, Var) &&IsA(right, Param))
else if (is_opclause(clause) && IsA(left, Var) && IsA(right, Param))
{
/* Function parameter used as index scan arg. DZ - 27-8-1996 */
*relid = left->varno;
*attno = left->varattno;
*constval = 0;
*flag = (_SELEC_NOT_CONSTANT_);
#endif
}
else if (is_opclause(clause) &&
is_funcclause((Node *) left) &&
@ -680,16 +691,13 @@ get_relattval(Node *clause,
*constval = 0;
*flag = (_SELEC_NOT_CONSTANT_);
}
#ifdef INDEXSCAN_PATCH
}
else if (is_opclause(clause) && IsA(right, Var) &&IsA(left, Param))
else if (is_opclause(clause) && IsA(right, Var) && IsA(left, Param))
{
/* ...And here... - vadim 01/22/97 */
*relid = right->varno;
*attno = right->varattno;
*constval = 0;
*flag = (_SELEC_NOT_CONSTANT_);
#endif
}
else
{

7
src/backend/optimizer/util/tlist.c
View File

@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/util/tlist.c,v 1.10 1998/02/10 04:01:21 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/util/tlist.c,v 1.11 1998/02/13 03:40:21 vadim Exp $
*
*-------------------------------------------------------------------------
*/
@ -273,6 +273,7 @@ match_varid(Var *test_var, List *tlist)
type_var = (Oid) test_var->vartype;
Assert (test_var->varlevelsup == 0);
foreach(tl, tlist)
{
TargetEntry *entry;
@ -288,9 +289,9 @@ match_varid(Var *test_var, List *tlist)
* we test the original varno (instead of varno which might be
* changed to INNER/OUTER.
*/
Assert (tlvar->varlevelsup == 0);
if (tlvar->varnoold == test_var->varnoold &&
tlvar->varoattno == test_var->varoattno &&
tlvar->varlevelsup == test_var->varlevelsup)
tlvar->varoattno == test_var->varoattno)
{
if (tlvar->vartype == type_var)

25
src/backend/optimizer/util/var.c
View File

@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/util/var.c,v 1.9 1998/02/10 04:01:27 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/util/var.c,v 1.10 1998/02/13 03:40:23 vadim Exp $
*
*-------------------------------------------------------------------------
*/
@ -18,6 +18,7 @@
#include <nodes/relation.h>
#include "nodes/primnodes.h"
#include "nodes/plannodes.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/internal.h"
@ -85,7 +86,7 @@ contain_var_clause(Node *clause)
return contain_var_clause(((Iter *) clause)->iterexpr);
else if (single_node(clause))
return FALSE;
else if (or_clause(clause) || and_clause(clause))
else if (or_clause(clause) || and_clause(clause) || is_funcclause(clause))
{
List *temp;
@ -96,7 +97,7 @@ contain_var_clause(Node *clause)
}
return FALSE;
}
else if (is_funcclause(clause))
else if (is_subplan(clause))
{
List *temp;
@ -105,6 +106,12 @@ contain_var_clause(Node *clause)
if (contain_var_clause(lfirst(temp)))
return TRUE;
}
/* Ok - check left sides of Oper-s */
foreach(temp, ((SubPlan*) ((Expr *) clause)->oper)->sublink->oper)
{
if (contain_var_clause(lfirst(((Expr*) lfirst(temp))->args)))
return TRUE;
}
return FALSE;
}
else if (IsA(clause, ArrayRef))
@ -156,19 +163,23 @@ pull_var_clause(Node *clause)
retval = pull_var_clause(((Iter *) clause)->iterexpr);
else if (single_node(clause))
retval = NIL;
else if (or_clause(clause) || and_clause(clause))
else if (or_clause(clause) || and_clause(clause) || is_funcclause(clause))
{
List *temp;
foreach(temp, ((Expr *) clause)->args)
retval = nconc(retval, pull_var_clause(lfirst(temp)));
}
else if (is_funcclause(clause))
else if (is_subplan(clause))
{
List *temp;
foreach(temp, ((Expr *) clause)->args)
foreach(temp, ((Expr*) clause)->args)
retval = nconc(retval, pull_var_clause(lfirst(temp)));
/* Ok - get Var-s from left sides of Oper-s */
foreach(temp, ((SubPlan*) ((Expr*) clause)->oper)->sublink->oper)
retval = nconc(retval,
pull_var_clause(lfirst(((Expr*) lfirst(temp))->args)));
}
else if (IsA(clause, Aggreg))
{
@ -213,7 +224,7 @@ var_equal(Var *var1, Var *var2)
(((Var *) var1)->varlevelsup == ((Var *) var2)->varlevelsup) &&
(((Var *) var1)->varattno == ((Var *) var2)->varattno))
{
Assert (((Var *) var1)->varlevelsup == 0);
return (true);
}
else