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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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25
src/backend/optimizer/util/var.c
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@@ -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