Avoid unnecessary reads of uncompression dictionary in MultiGet (#6906)
Summary: We may sometimes read the uncompression dictionary when its not necessary, when we lookup a key in an SST file but the index indicates the key is not present. This can happen with index_type 3. Pull Request resolved: https://github.com/facebook/rocksdb/pull/6906 Test Plan: make check Reviewed By: cheng-chang Differential Revision: D21828944 Pulled By: anand1976 fbshipit-source-id: 7aef4f0a39548d0874eafefd2687006d2652f9bb
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