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contrib/bloom/blcost.c
44 строки
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Tom Lane
Discount the metapage when estimating number of index pages visited.
20 мар 2026, 21:50
20 мар 2026, 21:50
733f20d
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/*------------------------------------------------------------------------- * * blcost.c * Cost estimate function for bloom indexes. * * Copyright (c) 2016-2026, 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; /* As in btcostestimate, count only the metapage as non-leaf */ costs.numNonLeafPages = 1; /* Use generic estimate */ genericcostestimate(root, path, loop_count, &costs); *indexStartupCost = costs.indexStartupCost; *indexTotalCost = costs.indexTotalCost; *indexSelectivity = costs.indexSelectivity; *indexCorrelation = costs.indexCorrelation; *indexPages = costs.numIndexPages; }