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/*-------------------------------------------------------------------------
*
* nodeFuncs.c--
* All node routines more complicated than simple access/modification
*
* Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/nodes/nodeFuncs.c,v 1.1.1.1 1996/07/09 06:21:32 scrappy Exp $
*
*-------------------------------------------------------------------------
*/
#include "c.h"
#include "nodes/primnodes.h"
#include "nodes/plannodes.h"
#include "nodes/pg_list.h"
#include "nodes/relation.h"
#include "nodes/nodeFuncs.h"
#include "utils/lsyscache.h"
/*
* single_node -
* Returns t if node corresponds to a single-noded expression
*/
bool
single_node(Node *node)
{
if(IsA(node,Ident) || IsA(node,Const) || IsA(node,Var) || IsA(node,Param))
return(true);
else
return(false);
}
/*****************************************************************************
* VAR nodes
*****************************************************************************/
/*
* var_is_outer
* var_is_inner
* var_is_mat
* var_is_rel
*
* Returns t iff the var node corresponds to (respectively):
* the outer relation in a join
* the inner relation of a join
* a materialized relation
* a base relation (i.e., not an attribute reference, a variable from
* some lower join level, or a sort result)
* var node is an array reference
*
*/
bool
var_is_outer (Var *var)
{
return((bool)(var->varno == OUTER));
}
bool
var_is_inner (Var *var)
{
return ( (bool) (var->varno == INNER));
}
bool
var_is_rel (Var *var)
{
return (bool)
! (var_is_inner (var) || var_is_outer (var));
}
/*****************************************************************************
* OPER nodes
*****************************************************************************/
/*
* replace_opid -
*
* Given a oper node, resets the opfid field with the
* procedure OID (regproc id).
*
* Returns the modified oper node.
*
*/
Oper *
replace_opid (Oper *oper)
{
oper->opid = get_opcode(oper->opno);
oper->op_fcache = NULL;
return(oper);
}
/*****************************************************************************
* constant (CONST, PARAM) nodes
*****************************************************************************/
/*
* non_null -
* Returns t if the node is a non-null constant, e.g., if the node has a
* valid `constvalue' field.
*
*/
bool
non_null (Expr *c)
{
if ( IsA(c,Const) && ! ((Const*)c)->constisnull )
return(true);
else
return(false);
}
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