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/*-------------------------------------------------------------------------
*
* parsetree.h
* Routines to access various components and subcomponents of
* parse trees.
*
*
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/parser/parsetree.h,v 1.23 2003/11/29 22:41:09 pgsql Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef PARSETREE_H
#define PARSETREE_H
#include "nodes/parsenodes.h"
#include "nodes/pg_list.h" /* for nth(), etc */
/* ----------------
* range table operations
* ----------------
*/
/*
* rt_fetch
*
* NB: this will crash and burn if handed an out-of-range RT index
*/
#define rt_fetch(rangetable_index, rangetable) \
((RangeTblEntry *) nth((rangetable_index)-1, rangetable))
/*
* 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 non-relation-type RTE.
*/
#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);
/*
* Given an RTE and an attribute number, return the appropriate
* type and typemod info for that attribute of that RTE.
*/
extern void get_rte_attribute_type(RangeTblEntry *rte, AttrNumber attnum,
Oid *vartype, int32 *vartypmod);
/* ----------------
* target list operations
* ----------------
*/
extern TargetEntry *get_tle_by_resno(List *tlist, AttrNumber resno);
#endif /* PARSETREE_H */
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