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5262f7a4fc
In combination with 569174f1be, which
taught the btree AM how to perform parallel index scans, this allows
parallel index scan plans on btree indexes. This infrastructure
should be general enough to support parallel index scans for other
index AMs as well, if someone updates them to support parallel
scans.
Amit Kapila, reviewed and tested by Anastasia Lubennikova, Tushar
Ahuja, and Haribabu Kommi, and me.
51 lines
1.3 KiB
C
51 lines
1.3 KiB
C
/*-------------------------------------------------------------------------
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*
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* blcost.c
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* Cost estimate function for bloom indexes.
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*
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* Copyright (c) 2016-2017, PostgreSQL Global Development Group
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*
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* IDENTIFICATION
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* contrib/bloom/blcost.c
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include "fmgr.h"
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#include "optimizer/cost.h"
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#include "utils/selfuncs.h"
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#include "bloom.h"
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/*
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* Estimate cost of bloom index scan.
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*/
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void
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blcostestimate(PlannerInfo *root, IndexPath *path, double loop_count,
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Cost *indexStartupCost, Cost *indexTotalCost,
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Selectivity *indexSelectivity, double *indexCorrelation,
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double *indexPages)
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{
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IndexOptInfo *index = path->indexinfo;
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List *qinfos;
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GenericCosts costs;
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/* Do preliminary analysis of indexquals */
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qinfos = deconstruct_indexquals(path);
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MemSet(&costs, 0, sizeof(costs));
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/* We have to visit all index tuples anyway */
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costs.numIndexTuples = index->tuples;
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/* Use generic estimate */
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genericcostestimate(root, path, loop_count, qinfos, &costs);
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*indexStartupCost = costs.indexStartupCost;
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*indexTotalCost = costs.indexTotalCost;
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*indexSelectivity = costs.indexSelectivity;
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*indexCorrelation = costs.indexCorrelation;
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*indexPages = costs.numIndexPages;
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}
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