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Fix costing for disk-based hash aggregation.

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Report and suggestions from Richard Guo and Tomas Vondra.

Discussion: https://postgr.es/m/CAMbWs4_W8fYbAn8KxgidAaZHON_Oo08OYn9ze=7remJymLqo5g@mail.gmail.com
This commit is contained in:
Jeff Davis
2020-03-28 10:53:01 -07:00
parent 4083f445c0
commit 7351bfeda3
2 changed files with 16 additions and 16 deletions
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2
src/backend/executor/nodeAgg.c
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@ -1728,6 +1728,8 @@ hash_agg_set_limits(double hashentrysize, uint64 input_groups, int used_bits,
/* if not expected to spill, use all of work_mem */
if (input_groups * hashentrysize < work_mem * 1024L)
{
if (num_partitions != NULL)
*num_partitions = 0;
*mem_limit = work_mem * 1024L;
*ngroups_limit = *mem_limit / hashentrysize;
return;