doc: PG 13 relnotes: hash_mem_multiplier can restore old behav.

Bruce Momjian <bruce@momjian.us>

Commit: e7a6cd5dcf24c6d4b04d036a4837c7af154c4b49
Author: Bruce Momjian <bruce@momjian.us>
Date: 2020-08-03T21:01:42Z
Releases: 13.0
doc:  PG 13 relnotes: hash_mem_multiplier can restore old behav.

Document that hash_mem_multiplier can get query behavior closer to the
pre-PG 13 behavior of allowing hashing to use more memory.

Reported-by: Peter Geoghegan

Discussion: https://postgr.es/m/CAH2-Wzn3kwQm_pe6g2=ki+P7+ZRqH5GvFGn6SWfv_j7UUgcLdQ@mail.gmail.com

Backpatch-through: 13 only

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doc/src/sgml/release-13.sgml modified +4 −1

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