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/*-------------------------------------------------------------------------
*
* parsetree.h
* Routines to access various components and subcomponents of
* parse trees.
*
*
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: parsetree.h,v 1.12 2000/09/25 18:14:53 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef PARSETREE_H
#define PARSETREE_H
#include "nodes/parsenodes.h"
#include "nodes/pg_list.h" /* for nth(), etc */
/* ----------------
* range table macros
* ----------------
*/
/*
* rt_fetch
* rt_store
*
* Access and (destructively) replace rangetable entries.
*/
#define rt_fetch(rangetable_index, rangetable) \
((RangeTblEntry *) nth((rangetable_index)-1, rangetable))
#define rt_store(rangetable_index, rangetable, rt) \
set_nth(rangetable, (rangetable_index)-1, rt)
/*
* getrelid
*
* Given the range index of a relation, return the corresponding
* relation OID. Note that InvalidOid will be returned if the
* RTE is for a sub-select rather than a relation.
*/
#define getrelid(rangeindex,rangetable) \
(rt_fetch(rangeindex, rangetable)->relid)
/*
* Given an RTE and an attribute number, return the appropriate
* variable name or alias for that attribute of that RTE.
*/
extern char *get_rte_attribute_name(RangeTblEntry *rte, AttrNumber attnum);
#endif /* PARSETREE_H */
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