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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