paul-rogers edited a comment on issue #1944: DRILL-7503: Refactor the project operator URL: https://github.com/apache/drill/pull/1944#issuecomment-571235610 @ihuzenko, the goal of this refactoring was simply to pull out the code gen part. The `VectorState` is an admitted hack to create a clean interface on the CG side, though it is messy on the operator side. I was really hoping to not change the execution part of the project operator in this PR in order to limit the scope of changes. Maybe I'll go with the interface route (discussed in an earlier note), which will help with the longer term goal outlined below. Let me play with the code to see how that approach might work.
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