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Diffstat (limited to 'src/backend/optimizer/plan/planner.c')
| -rw-r--r-- | src/backend/optimizer/plan/planner.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/src/backend/optimizer/plan/planner.c b/src/backend/optimizer/plan/planner.c index f657ffc4463..644b8b6763d 100644 --- a/src/backend/optimizer/plan/planner.c +++ b/src/backend/optimizer/plan/planner.c @@ -3292,6 +3292,12 @@ estimate_hashagg_tablesize(Path *path, const AggClauseCosts *agg_costs, /* plus the per-hash-entry overhead */ hashentrysize += hash_agg_entry_size(agg_costs->numAggs); + /* + * Note that this disregards the effect of fill-factor and growth policy + * of the hash-table. That's probably ok, given default the default + * fill-factor is relatively high. It'd be hard to meaningfully factor in + * "double-in-size" growth policies here. + */ return hashentrysize * dNumGroups; } |