Github user zuyu commented on the issue:
https://github.com/apache/incubator-quickstep/pull/240
@jianqiao We missed the following comments in this PR:
* [Remove unused `moveTypedValue` method in
`types/containers/ColumnVector.hpp`](https://github.com/apache/incubator-quickstep/pull/237#discussion_r112827764)
* [Change `hash_cache_` as a `std::uint64_t`, instead of a smart
pointer](https://github.com/apache/incubator-quickstep/pull/237#discussion_r112828399)
* [`override` destructor needed for
`CommonSubexpression`](https://github.com/apache/incubator-quickstep/pull/237#discussion_r112847577)
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