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postgresql/src/include/optimizer/cost.h

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Postgres95 1.01 Distribution - Virgin Sources
1996-07-09 08:22:35 +02:00
/*-------------------------------------------------------------------------
*
Change my-function-name-- to my_function_name, and optimizer renames.
1999-02-14 00:22:53 +01:00
* cost.h
Massive commit to run PGINDENT on all *.c and *.h files.
1997-09-07 07:04:48 +02:00
* prototypes for costsize.c and clausesel.c.
Postgres95 1.01 Distribution - Virgin Sources
1996-07-09 08:22:35 +02:00
*
*
Add: * Portions Copyright (c) 1996-2000, PostgreSQL, Inc to all files copyright Regents of Berkeley. Man, that's a lot of files.
2000-01-26 06:58:53 +01:00
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
Postgres95 1.01 Distribution - Virgin Sources
1996-07-09 08:22:35 +02:00
*
Repair planning bugs caused by my misguided removal of restrictinfo link fields in JoinPaths --- turns out that we do need that after all :-(. Also, rearrange planner so that only one RelOptInfo is created for a particular set of joined base relations, no matter how many different subsets of relations it can be created from. This saves memory and processing time compared to the old method of making a bunch of RelOptInfos and then removing the duplicates. Clean up the jointree iteration logic; not sure if it's better, but I sure find it more readable and plausible now, particularly for the case of 'bushy plans'.
2000-02-07 05:41:04 +01:00
* $Id: cost.h,v 1.29 2000/02/07 04:41:04 tgl Exp $
Postgres95 1.01 Distribution - Virgin Sources
1996-07-09 08:22:35 +02:00
*
*-------------------------------------------------------------------------
*/
#ifndef COST_H
#define COST_H
Cleanup up include files.
1997-11-26 02:14:33 +01:00
#include "nodes/relation.h"
First cut at unifying regular selectivity estimation with indexscan selectivity estimation wasn't right. This is better...
2000-01-23 03:07:00 +01:00
/* defaults for costsize.c's Cost parameters */
/* NB: cost-estimation code should use the variables, not the constants! */
#define CPU_PAGE_WEIGHT 0.033
#define CPU_INDEX_PAGE_WEIGHT 0.017
Clean up #include in /include directory. Add scripts for checking includes.
1999-07-15 17:21:54 +02:00
/* defaults for function attributes used for expensive function calculations */
#define BYTE_PCT 100
#define PERBYTE_CPU 0
#define PERCALL_CPU 0
#define OUTIN_RATIO 100
Revise handling of index-type-specific indexscan cost estimation, per pghackers discussion of 5-Jan-2000. The amopselect and amopnpages estimators are gone, and in their place is a per-AM amcostestimate procedure (linked to from pg_am, not pg_amop).
2000-01-23 00:50:30 +01:00
Clean up #include in /include directory. Add scripts for checking includes.
1999-07-15 17:21:54 +02:00
Postgres95 1.01 Distribution - Virgin Sources
1996-07-09 08:22:35 +02:00
/*
Change my-function-name-- to my_function_name, and optimizer renames.
1999-02-14 00:22:53 +01:00
* prototypes for costsize.c
Massive commit to run PGINDENT on all *.c and *.h files.
1997-09-07 07:04:48 +02:00
* routines to compute costs and sizes
*/
Revise handling of index-type-specific indexscan cost estimation, per pghackers discussion of 5-Jan-2000. The amopselect and amopnpages estimators are gone, and in their place is a per-AM amcostestimate procedure (linked to from pg_am, not pg_amop).
2000-01-23 00:50:30 +01:00
extern Cost cpu_page_weight;
extern Cost cpu_index_page_weight;
extern Cost disable_cost;
extern bool enable_seqscan;
extern bool enable_indexscan;
extern bool enable_tidscan;
extern bool enable_sort;
extern bool enable_nestloop;
extern bool enable_mergejoin;
extern bool enable_hashjoin;
Postgres95 1.01 Distribution - Virgin Sources
1996-07-09 08:22:35 +02:00
Another round of planner/optimizer work. This is just restructuring and code cleanup; no major improvements yet. However, EXPLAIN does produce more intuitive outputs for nested loops with indexscans now...
2000-01-09 01:26:47 +01:00
extern Cost cost_seqscan(RelOptInfo *baserel);
Revise handling of index-type-specific indexscan cost estimation, per pghackers discussion of 5-Jan-2000. The amopselect and amopnpages estimators are gone, and in their place is a per-AM amcostestimate procedure (linked to from pg_am, not pg_amop).
2000-01-23 00:50:30 +01:00
extern Cost cost_index(Query *root, RelOptInfo *baserel, IndexOptInfo *index,
List *indexQuals, bool is_injoin);
Another round of planner/optimizer work. This is just restructuring and code cleanup; no major improvements yet. However, EXPLAIN does produce more intuitive outputs for nested loops with indexscans now...
2000-01-09 01:26:47 +01:00
extern Cost cost_tidscan(RelOptInfo *baserel, List *tideval);
extern Cost cost_sort(List *pathkeys, double tuples, int width);
extern Cost cost_nestloop(Path *outer_path, Path *inner_path,
bool is_indexjoin);
extern Cost cost_mergejoin(Path *outer_path, Path *inner_path,
List *outersortkeys, List *innersortkeys);
extern Cost cost_hashjoin(Path *outer_path, Path *inner_path,
Selectivity innerdisbursion);
Repair planning bugs caused by my misguided removal of restrictinfo link fields in JoinPaths --- turns out that we do need that after all :-(. Also, rearrange planner so that only one RelOptInfo is created for a particular set of joined base relations, no matter how many different subsets of relations it can be created from. This saves memory and processing time compared to the old method of making a bunch of RelOptInfos and then removing the duplicates. Clean up the jointree iteration logic; not sure if it's better, but I sure find it more readable and plausible now, particularly for the case of 'bushy plans'.
2000-02-07 05:41:04 +01:00
extern void set_baserel_size_estimates(Query *root, RelOptInfo *rel);
extern void set_joinrel_size_estimates(Query *root, RelOptInfo *rel,
RelOptInfo *outer_rel,
RelOptInfo *inner_rel,
List *restrictlist);
Postgres95 1.01 Distribution - Virgin Sources
1996-07-09 08:22:35 +02:00
/*
Another round of planner/optimizer work. This is just restructuring and code cleanup; no major improvements yet. However, EXPLAIN does produce more intuitive outputs for nested loops with indexscans now...
2000-01-09 01:26:47 +01:00
* prototypes for clausesel.c
Massive commit to run PGINDENT on all *.c and *.h files.
1997-09-07 07:04:48 +02:00
* routines to compute clause selectivities
Postgres95 1.01 Distribution - Virgin Sources
1996-07-09 08:22:35 +02:00
*/
First cut at unifying regular selectivity estimation with indexscan selectivity estimation wasn't right. This is better...
2000-01-23 03:07:00 +01:00
extern Selectivity restrictlist_selectivity(Query *root,
List *restrictinfo_list,
int varRelid);
extern Selectivity clauselist_selectivity(Query *root,
List *clauses,
int varRelid);
extern Selectivity clause_selectivity(Query *root,
Node *clause,
int varRelid);
Postgres95 1.01 Distribution - Virgin Sources
1996-07-09 08:22:35 +02:00
OK, folks, here is the pgindent output.
1998-09-01 06:40:42 +02:00
#endif /* COST_H */