RAND* commands: fix risk of OOM panic in hash and zset, use fair random in...
RAND* commands: fix risk of OOM panic in hash and zset, use fair random in hash, and add tests for even distribution to all (#8429)
Changes to HRANDFIELD and ZRANDMEMBER:
* Fix risk of OOM panic when client query a very big negative count (avoid allocating huge temporary buffer).
* Fix uneven random distribution in HRANDFIELD with negative count (wasn't using dictGetFairRandomKey).
* Add tests to check an even random distribution (HRANDFIELD, SRANDMEMBER, ZRANDMEMBER).
Co-authored-by:
Oran Agra <oran@redislabs.com>
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