/*-------------------------------------------------------------------------
 *
 * cost.h--
 *    prototypes for costsize.c and clausesel.c.
 *
 *
 * Copyright (c) 1994, Regents of the University of California
 *
 * $Id: cost.h,v 1.2 1997/08/19 21:39:18 momjian Exp $
 *
 *-------------------------------------------------------------------------
 */
#ifndef COST_H
#define COST_H

/*
 * prototypes for costsize.c--
 *    routines to compute costs and sizes
 */ 
extern bool _enable_seqscan_;
extern bool _enable_indexscan_;
extern bool _enable_sort_;
extern bool _enable_hash_;
extern bool _enable_nestloop_;
extern bool _enable_mergesort_;
extern bool _enable_hashjoin_;

extern Cost cost_seqscan(int relid, int relpages, int reltuples);
extern Cost cost_index(Oid indexid, int expected_indexpages, Cost selec,
		       int relpages, int reltuples, int indexpages,
		       int indextuples, bool is_injoin);
extern Cost cost_sort(List *keys, int tuples, int width, bool noread);
extern Cost cost_nestloop(Cost outercost, Cost innercost, int outertuples,
		int innertuples, int outerpages, bool is_indexjoin);
extern Cost cost_mergesort(Cost outercost, Cost innercost,
		List *outersortkeys, List *innersortkeys,
		int outersize, int innersize, int outerwidth, int innerwidth);
extern Cost cost_hashjoin(Cost outercost, Cost innercost, List *outerkeys,
		List *innerkeys, int outersize, int innersize,
		int outerwidth, int innerwidth);
extern int compute_rel_size(Rel *rel);
extern int compute_rel_width(Rel *rel);
extern int compute_joinrel_size(JoinPath *joinpath);
extern int page_size(int tuples, int width);

/*
 * prototypes for fuctions in clausesel.h--
 *    routines to compute clause selectivities
 */
extern void set_clause_selectivities(List *clauseinfo_list, Cost new_selectivity);
extern Cost product_selec(List *clauseinfo_list);
extern void set_rest_relselec(Query *root, List *rel_list);
extern void set_rest_selec(Query *root,List *clauseinfo_list);
extern Cost compute_clause_selec(Query *root,
				 Node *clause, List *or_selectivities);

#endif	/* COST_H */