1996-07-09 08:22:35 +02:00
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/*-------------------------------------------------------------------------
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*
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1999-02-14 00:22:53 +01:00
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* cost.h
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1997-09-07 07:04:48 +02:00
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* prototypes for costsize.c and clausesel.c.
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1996-07-09 08:22:35 +02:00
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*
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*
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2000-01-26 06:58:53 +01:00
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* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
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* Portions Copyright (c) 1994, Regents of the University of California
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1996-07-09 08:22:35 +02:00
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*
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2000-01-26 06:58:53 +01:00
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* $Id: cost.h,v 1.28 2000/01/26 05:58:20 momjian Exp $
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1996-07-09 08:22:35 +02:00
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef COST_H
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#define COST_H
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1997-11-26 02:14:33 +01:00
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#include "nodes/relation.h"
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2000-01-23 03:07:00 +01:00
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/* defaults for costsize.c's Cost parameters */
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/* NB: cost-estimation code should use the variables, not the constants! */
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#define CPU_PAGE_WEIGHT 0.033
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#define CPU_INDEX_PAGE_WEIGHT 0.017
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1999-07-15 17:21:54 +02:00
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/* defaults for function attributes used for expensive function calculations */
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#define BYTE_PCT 100
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#define PERBYTE_CPU 0
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#define PERCALL_CPU 0
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#define OUTIN_RATIO 100
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2000-01-23 00:50:30 +01:00
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1999-07-15 17:21:54 +02:00
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1996-07-09 08:22:35 +02:00
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/*
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1999-02-14 00:22:53 +01:00
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* prototypes for costsize.c
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1997-09-07 07:04:48 +02:00
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* routines to compute costs and sizes
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*/
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2000-01-23 00:50:30 +01:00
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extern Cost cpu_page_weight;
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extern Cost cpu_index_page_weight;
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extern Cost disable_cost;
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extern bool enable_seqscan;
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extern bool enable_indexscan;
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extern bool enable_tidscan;
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extern bool enable_sort;
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extern bool enable_nestloop;
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extern bool enable_mergejoin;
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extern bool enable_hashjoin;
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1996-07-09 08:22:35 +02:00
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2000-01-09 01:26:47 +01:00
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extern Cost cost_seqscan(RelOptInfo *baserel);
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2000-01-23 00:50:30 +01:00
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extern Cost cost_index(Query *root, RelOptInfo *baserel, IndexOptInfo *index,
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List *indexQuals, bool is_injoin);
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2000-01-09 01:26:47 +01:00
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extern Cost cost_tidscan(RelOptInfo *baserel, List *tideval);
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extern Cost cost_sort(List *pathkeys, double tuples, int width);
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extern Cost cost_nestloop(Path *outer_path, Path *inner_path,
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bool is_indexjoin);
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extern Cost cost_mergejoin(Path *outer_path, Path *inner_path,
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List *outersortkeys, List *innersortkeys);
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extern Cost cost_hashjoin(Path *outer_path, Path *inner_path,
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Selectivity innerdisbursion);
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extern void set_rel_rows_width(Query *root, RelOptInfo *rel);
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extern void set_joinrel_rows_width(Query *root, RelOptInfo *rel,
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JoinPath *joinpath);
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1996-07-09 08:22:35 +02:00
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/*
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2000-01-09 01:26:47 +01:00
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* prototypes for clausesel.c
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1997-09-07 07:04:48 +02:00
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* routines to compute clause selectivities
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1996-07-09 08:22:35 +02:00
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*/
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2000-01-23 03:07:00 +01:00
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extern Selectivity restrictlist_selectivity(Query *root,
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List *restrictinfo_list,
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int varRelid);
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extern Selectivity clauselist_selectivity(Query *root,
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List *clauses,
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int varRelid);
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extern Selectivity clause_selectivity(Query *root,
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Node *clause,
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int varRelid);
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1996-07-09 08:22:35 +02:00
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1998-09-01 06:40:42 +02:00
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#endif /* COST_H */
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