text: /*-------------------------------------------------------------------------
   *
   * pathnode.h--
   *    prototypes for pathnode.c, indexnode.c, relnode.c.
   *
   *
   * Copyright (c) 1994, Regents of the University of California
   *
   * $Id: pathnode.h,v 1.1.1.1 1996/07/09 06:21:34 scrappy Exp $
   *
   *-------------------------------------------------------------------------
   */
  #ifndef PATHNODE_H
  #define PATHNODE_H
  
  /*
   * prototypes for pathnode.c
   */
  extern bool path_is_cheaper(Path *path1, Path *path2);
  extern Path *set_cheapest(Rel *parent_rel, List *pathlist);
  extern List *add_pathlist(Rel *parent_rel, List *unique_paths,
  			      List *new_paths);
  extern Path *create_seqscan_path(Rel *rel);
  extern IndexPath *create_index_path(Query *root, Rel *rel, Rel *index,
  			 List *restriction_clauses, bool is_join_scan);
  extern JoinPath *create_nestloop_path(Rel *joinrel, Rel *outer_rel,
  			 Path *outer_path, Path *inner_path, List *keys);
  extern MergePath *create_mergesort_path(Rel *joinrel, int outersize,
       int innersize, int outerwidth, int innerwidth, Path *outer_path,
       Path *inner_path, List *keys, MergeOrder *order,
       List *mergeclauses, List *outersortkeys, List *innersortkeys);
  
  extern HashPath *create_hashjoin_path(Rel *joinrel, int outersize,
       int innersize, int outerwidth, int innerwidth, Path *outer_path,
       Path *inner_path, List *keys, Oid operator, List *hashclauses,
       List *outerkeys, List *innerkeys);
  
  /*
   * prototypes for rel.c
   */
  extern Rel *rel_member(List *relid, List *rels);
  extern Rel *get_base_rel(Query* root, int relid);
  extern Rel *get_join_rel(Query* root, List *relid);
  
  /*
   * prototypes for indexnode.h
   */
  extern List *find_relation_indices(Query *root,Rel *rel);
  
  #endif	/* PATHNODE_H */
  