db_bench separate options for partition index and filters
Summary: Some workloads (like my current benchmarking) may want partitioned indexes without partitioned filters. Particularly, when `-optimize_filters_for_hits=true`, the total index size may be larger than the total filter size, so it can make sense to hold all filters in-memory but not all indexes. Closes https://github.com/facebook/rocksdb/pull/3492 Differential Revision: D6970092 Pulled By: ajkr fbshipit-source-id: b7fa1828e1d13829339aefb90fd56eb7c5337f61
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