More improvements to filter_bench (#5968)
Summary: * Adds support for plain table filter. This is not critical right now, but does add a -impl flag that will be useful for new filter implementations initially targeted at block-based table (and maybe later ported to plain table) * Better mixing of inside vs. outside queries, for more realism * A -best_case option handy for implementation tuning inner loop * Option for whether to include hashing time in dry run / net timings No modifications to production code, just filter_bench. Pull Request resolved: https://github.com/facebook/rocksdb/pull/5968 Differential Revision: D18139872 Pulled By: pdillinger fbshipit-source-id: 5b09eba963111b48f9e0525a706e9921070990e8
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