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blcost.c
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1 /*-------------------------------------------------------------------------
2  *
3  * blcost.c
4  * Cost estimate function for bloom indexes.
5  *
6  * Copyright (c) 2016-2020, PostgreSQL Global Development Group
7  *
8  * IDENTIFICATION
9  * contrib/bloom/blcost.c
10  *
11  *-------------------------------------------------------------------------
12  */
13 #include "postgres.h"
14 
15 #include "bloom.h"
16 #include "fmgr.h"
17 #include "utils/selfuncs.h"
18 
19 /*
20  * Estimate cost of bloom index scan.
21  */
22 void
23 blcostestimate(PlannerInfo *root, IndexPath *path, double loop_count,
24  Cost *indexStartupCost, Cost *indexTotalCost,
25  Selectivity *indexSelectivity, double *indexCorrelation,
26  double *indexPages)
27 {
28  IndexOptInfo *index = path->indexinfo;
29  GenericCosts costs;
30 
31  MemSet(&costs, 0, sizeof(costs));
32 
33  /* We have to visit all index tuples anyway */
34  costs.numIndexTuples = index->tuples;
35 
36  /* Use generic estimate */
37  genericcostestimate(root, path, loop_count, &costs);
38 
39  *indexStartupCost = costs.indexStartupCost;
40  *indexTotalCost = costs.indexTotalCost;
41  *indexSelectivity = costs.indexSelectivity;
42  *indexCorrelation = costs.indexCorrelation;
43  *indexPages = costs.numIndexPages;
44 }
Selectivity indexSelectivity
Definition: selfuncs.h:109
IndexOptInfo * indexinfo
Definition: pathnodes.h:1207
#define MemSet(start, val, len)
Definition: c.h:971
double Selectivity
Definition: nodes.h:662
double tuples
Definition: pathnodes.h:824
void blcostestimate(PlannerInfo *root, IndexPath *path, double loop_count, Cost *indexStartupCost, Cost *indexTotalCost, Selectivity *indexSelectivity, double *indexCorrelation, double *indexPages)
Definition: blcost.c:23
Definition: type.h:89
void genericcostestimate(PlannerInfo *root, IndexPath *path, double loop_count, GenericCosts *costs)
Definition: selfuncs.c:5995
Cost indexTotalCost
Definition: selfuncs.h:108
double indexCorrelation
Definition: selfuncs.h:110
double numIndexTuples
Definition: selfuncs.h:114
Cost indexStartupCost
Definition: selfuncs.h:107
double Cost
Definition: nodes.h:663
double numIndexPages
Definition: selfuncs.h:113