Line data    Source code

       1             : /*-------------------------------------------------------------------------
       2             :  *
       3             :  * blcost.c
       4             :  *      Cost estimate function for bloom indexes.
       5             :  *
       6             :  * Copyright (c) 2016-2024, 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         812 : blcostestimate(PlannerInfo *root, IndexPath *path, double loop_count,
      24             :                Cost *indexStartupCost, Cost *indexTotalCost,
      25             :                Selectivity *indexSelectivity, double *indexCorrelation,
      26             :                double *indexPages)
      27             : {
      28         812 :     IndexOptInfo *index = path->indexinfo;
      29         812 :     GenericCosts costs = {0};
      30             : 
      31             :     /* We have to visit all index tuples anyway */
      32         812 :     costs.numIndexTuples = index->tuples;
      33             : 
      34             :     /* Use generic estimate */
      35         812 :     genericcostestimate(root, path, loop_count, &costs);
      36             : 
      37         812 :     *indexStartupCost = costs.indexStartupCost;
      38         812 :     *indexTotalCost = costs.indexTotalCost;
      39         812 :     *indexSelectivity = costs.indexSelectivity;
      40         812 :     *indexCorrelation = costs.indexCorrelation;
      41         812 :     *indexPages = costs.numIndexPages;
      42         812 : }