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Include chunk overhead in hash table entry size estimate.

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Don't try to be precise about it, just use a constant 16 bytes of
chunk overhead. Being smarter would require knowing the memory context
where the chunk will be allocated, which is not known by all callers.

Discussion: https://postgr.es/m/20200325220936.il3ni2fj2j2b45y5@alap3.anarazel.de
This commit is contained in:
Jeff Davis
2020-04-03 19:52:16 -07:00
parent 3e0d80fd8d
commit 0588ee63aa
2 changed files with 31 additions and 7 deletions
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2
src/include/executor/nodeAgg.h
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@@ -314,7 +314,7 @@ extern AggState *ExecInitAgg(Agg *node, EState *estate, int eflags);
extern void ExecEndAgg(AggState *node);
extern void ExecReScanAgg(AggState *node);
extern Size hash_agg_entry_size(int numAggs, Size tupleWidth,
extern Size hash_agg_entry_size(int numTrans, Size tupleWidth,
Size transitionSpace);
extern void hash_agg_set_limits(double hashentrysize, uint64 input_groups,
int used_bits, Size *mem_limit,