75dfc7883d
Summary: As described in detail in issue https://github.com/facebook/rocksdb/issues/6048, iterators' dereference operators (`*`, `->`, and `[]`) should return `pointer`s/`reference`s (as opposed to `const_pointer`s/`const_reference`s) even if the iterator itself is `const` to be in sync with the standard's iterator concept. Pull Request resolved: https://github.com/facebook/rocksdb/pull/6057 Test Plan: make check Differential Revision: D18623235 Pulled By: ltamasi fbshipit-source-id: 04e82d73bc0c67fb0ded018383af8dfc332050cc