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/*-------------------------------------------------------------------------
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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 1.25 2000/01/09 00:26:46 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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/*
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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 bool _enable_seqscan_;
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extern bool _enable_indexscan_;
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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 bool _enable_tidscan_;
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extern Cost cost_seqscan(RelOptInfo *baserel);
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extern Cost cost_index(RelOptInfo *baserel, IndexOptInfo *index,
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long expected_indexpages, Selectivity selec,
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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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