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Refactor hash_agg_entry_size().

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Consolidate the calculations for hash table size estimation. This will
help with upcoming Hash Aggregation work that will add additional call
sites.
This commit is contained in:
Jeff Davis
2020-02-06 11:49:56 -08:00
parent c02fdc9223
commit 7d4395d0a1
4 changed files with 14 additions and 33 deletions
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12
src/backend/utils/adt/selfuncs.c
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@ -3526,16 +3526,8 @@ double
estimate_hashagg_tablesize(Path *path, const AggClauseCosts *agg_costs,
double dNumGroups)
{
Size hashentrysize;
/* Estimate per-hash-entry space at tuple width... */
hashentrysize = MAXALIGN(path->pathtarget->width) +
MAXALIGN(SizeofMinimalTupleHeader);
/* plus space for pass-by-ref transition values... */
hashentrysize += agg_costs->transitionSpace;
/* plus the per-hash-entry overhead */
hashentrysize += hash_agg_entry_size(agg_costs->numAggs);
Size hashentrysize = hash_agg_entry_size(
agg_costs->numAggs, path->pathtarget->width, agg_costs->transitionSpace);
/*
* Note that this disregards the effect of fill-factor and growth policy