/*-------------------------------------------------------------------------
 *
 * tlist.h
 *	  prototypes for tlist.c.
 *
 *
 * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/optimizer/tlist.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef TLIST_H
#define TLIST_H

#include "optimizer/var.h"


extern TargetEntry *tlist_member(Node *node, List *targetlist);
extern TargetEntry *tlist_member_ignore_relabel(Node *node, List *targetlist);
extern TargetEntry *tlist_member_match_var(Var *var, List *targetlist);

extern List *flatten_tlist(List *tlist, PVCAggregateBehavior aggbehavior,
			  PVCPlaceHolderBehavior phbehavior);
extern List *add_to_flat_tlist(List *tlist, List *exprs);

extern List *get_tlist_exprs(List *tlist, bool includeJunk);

extern bool tlist_same_exprs(List *tlist1, List *tlist2);

extern bool tlist_same_datatypes(List *tlist, List *colTypes, bool junkOK);
extern bool tlist_same_collations(List *tlist, List *colCollations, bool junkOK);

extern TargetEntry *get_sortgroupref_tle(Index sortref,
					 List *targetList);
extern TargetEntry *get_sortgroupclause_tle(SortGroupClause *sgClause,
						List *targetList);
extern Node *get_sortgroupclause_expr(SortGroupClause *sgClause,
						 List *targetList);
extern List *get_sortgrouplist_exprs(List *sgClauses,
						List *targetList);

extern Oid *extract_grouping_ops(List *groupClause);
extern AttrNumber *extract_grouping_cols(List *groupClause, List *tlist);
extern bool grouping_is_sortable(List *groupClause);
extern bool grouping_is_hashable(List *groupClause);

#endif   /* TLIST_H */