Teodor Sigaev e51a04840a Add general purpose hasing functions to pgbench.
Hashing function is useful for simulating real-world workload in test like
WEB workload, as an example - YCSB benchmarks.

Author: Ildar Musin with minor editorization by me
Reviewed by: Fabien Coelho, me
Discussion: https://www.postgresql.org/message-id/flat/0e8bd39e-dfcd-2879-f88f-272799ad7ef2@postgrespro.ru
2018-03-21 18:01:23 +03:00
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