contrib/bloom/blcost.c

   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 }