Quelle  blcost.c

/*-------------------------------------------------------------------------
 *
 * blcost.c
 *  Cost estimate function for bloom indexes.
 *
 * Copyright (c) 2016-2025, PostgreSQL Global Development Group
 *
 * IDENTIFICATION
 *   contrib/bloom/blcost.c
 *
 *-------------------------------------------------------------------------
 */
#include "postgres.h"

#include "bloom.h"
#include "utils/selfuncs.h"

/*
 * Estimate cost of bloom index scan.
 */
void
blcostestimate(PlannerInfo *root, IndexPath *path, double loop_count,
      Cost *indexStartupCost, Cost *indexTotalCost,
      Selectivity *indexSelectivity, double *indexCorrelation,
      double *indexPages)
{
 IndexOptInfo *index = path->indexinfo;
 GenericCosts costs = {0};

 /* We have to visit all index tuples anyway */
 costs.numIndexTuples = index->tuples;

 /* Use generic estimate */
 genericcostestimate(root, path, loop_count, &costs);

 *indexStartupCost = costs.indexStartupCost;
 *indexTotalCost = costs.indexTotalCost;
 *indexSelectivity = costs.indexSelectivity;
 *indexCorrelation = costs.indexCorrelation;
 *indexPages = costs.numIndexPages;
}