71ed7eb494
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).
69 lines
2.2 KiB
C
69 lines
2.2 KiB
C
/*-------------------------------------------------------------------------
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*
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* cost.h
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* prototypes for costsize.c and clausesel.c.
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*
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*
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* Copyright (c) 1994, Regents of the University of California
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*
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* $Id: cost.h,v 1.26 2000/01/22 23:50:26 tgl Exp $
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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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#include "nodes/relation.h"
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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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/* 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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/*
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* prototypes for costsize.c
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* routines to compute costs and sizes
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*/
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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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extern Cost cost_seqscan(RelOptInfo *baserel);
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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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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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/*
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* prototypes for clausesel.c
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* routines to compute clause selectivities
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*/
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extern Selectivity restrictlist_selec(Query *root, List *restrictinfo_list);
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extern Selectivity clauselist_selec(Query *root, List *clauses);
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extern Selectivity compute_clause_selec(Query *root, Node *clause);
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#endif /* COST_H */
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