/*-------------------------------------------------------------------------

*

* blcost.c

* Cost estimate function for bloom indexes.

*

* Copyright (c) 2016-2017, PostgreSQL Global Development Group

*

* IDENTIFICATION

* contrib/bloom/blcost.c

*

*-------------------------------------------------------------------------

*/

#include "postgres.h"

#include "fmgr.h"

#include "optimizer/cost.h"

#include "utils/selfuncs.h"

#include "bloom.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;

List *qinfos;

GenericCosts costs;

/* Do preliminary analysis of indexquals */

qinfos = deconstruct_indexquals(path);

MemSet(&costs, 0, sizeof(costs));

/* We have to visit all index tuples anyway */

costs.numIndexTuples = index->tuples;

/* Use generic estimate */

genericcostestimate(root, path, loop_count, qinfos, &costs);

*indexStartupCost = costs.indexStartupCost;

*indexTotalCost = costs.indexTotalCost;

*indexSelectivity = costs.indexSelectivity;

*indexCorrelation = costs.indexCorrelation;

*indexPages = costs.numIndexPages;

}