text: /*-------------------------------------------------------------------------
   *
   * tlist.h
   *	  prototypes for tlist.c.
   *
   *
   * Portions Copyright (c) 1996-2011, 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 */
  