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119 lines
2.6 KiB
C
119 lines
2.6 KiB
C
/*-------------------------------------------------------------------------
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*
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* nodeFuncs.c--
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* All node routines more complicated than simple access/modification
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*
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* Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/nodes/nodeFuncs.c,v 1.5 1997/09/08 02:23:40 momjian Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#include <sys/types.h>
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#include "postgres.h"
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#include "nodes/primnodes.h"
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#include "nodes/plannodes.h"
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#include "nodes/pg_list.h"
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#include "nodes/relation.h"
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#include "nodes/nodeFuncs.h"
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#include "utils/lsyscache.h"
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static bool var_is_inner(Var * var);
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/*
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* single_node -
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* Returns t if node corresponds to a single-noded expression
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*/
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bool
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single_node(Node * node)
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{
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if (IsA(node, Ident) || IsA(node, Const) || IsA(node, Var) || IsA(node, Param))
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return (true);
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else
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return (false);
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}
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/*****************************************************************************
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* VAR nodes
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*****************************************************************************/
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/*
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* var_is_outer
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* var_is_inner
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* var_is_mat
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* var_is_rel
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*
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* Returns t iff the var node corresponds to (respectively):
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* the outer relation in a join
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* the inner relation of a join
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* a materialized relation
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* a base relation (i.e., not an attribute reference, a variable from
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* some lower join level, or a sort result)
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* var node is an array reference
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*
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*/
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bool
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var_is_outer(Var * var)
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{
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return ((bool) (var->varno == OUTER));
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}
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static bool
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var_is_inner(Var * var)
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{
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return ((bool) (var->varno == INNER));
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}
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bool
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var_is_rel(Var * var)
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{
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return (bool)
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! (var_is_inner(var) || var_is_outer(var));
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}
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/*****************************************************************************
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* OPER nodes
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*****************************************************************************/
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/*
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* replace_opid -
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*
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* Given a oper node, resets the opfid field with the
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* procedure OID (regproc id).
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*
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* Returns the modified oper node.
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*
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*/
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Oper *
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replace_opid(Oper * oper)
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{
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oper->opid = get_opcode(oper->opno);
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oper->op_fcache = NULL;
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return (oper);
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}
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/*****************************************************************************
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* constant (CONST, PARAM) nodes
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*****************************************************************************/
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/*
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* non_null -
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* Returns t if the node is a non-null constant, e.g., if the node has a
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* valid `constvalue' field.
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*
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*/
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bool
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non_null(Expr * c)
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{
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if (IsA(c, Const) && !((Const *) c)->constisnull)
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return (true);
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else
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return (false);
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}
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