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/*-------------------------------------------------------------------------
*
* cost.h--
* prototypes for costsize.c and clausesel.c.
*
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: cost.h,v 1.1.1.1 1996/07/09 06:21:34 scrappy 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_result(int tuples, int width);
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_targetlist_width(List *targetlist);
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 */
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