Github user zuyu commented on the pull request:
https://github.com/apache/incubator-quickstep/commit/6d83b46af25b35fb0b3a23452b6fbd2842b33793#commitcomment-22660685
In query_optimizer/rules/ReorderColumns.cpp:
In query_optimizer/rules/ReorderColumns.cpp on line 172:
@jianqiao If I understand correctly, if there is no changes in
`project_expressions`, we don't need to create a copy of `output`, right?
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