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/*-------------------------------------------------------------------------
*
* nodeFuncs.c
* All node routines more complicated than simple access/modification
*
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/nodes/nodeFuncs.c,v 1.28 2007/01/05 22:19:30 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "nodes/nodeFuncs.h"
static bool var_is_inner(Var *var);
/*
* single_node -
* Returns t if node corresponds to a single-noded expression
*/
bool
single_node(Node *node)
{
if (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);
}
static 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));
}
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