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authorJeff Davis2020-09-07 20:31:59 +0000
committerJeff Davis2020-09-07 20:31:59 +0000
commita547e6867527ca16628a3fb1cf3ef6f785210a31 (patch)
tree1d6c0862569114cf9061f8038b9d30cf56262a9d /contrib/postgres_fdw
parent53367e6c62e3111eccdd578a3fa607c48c3e1fb6 (diff)
Adjust cost model for HashAgg that spills to disk.
Tomas Vondra observed that the IO behavior for HashAgg tends to be worse than for Sort. Penalize HashAgg IO costs accordingly. Also, account for the CPU effort of spilling the tuples and reading them back. Discussion: https://postgr.es/m/20200906212112.nzoy5ytrzjjodpfh@development Reviewed-by: Tomas Vondra Backpatch-through: 13
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