[GitHub] [incubator-pinot] Jackie-Jiang commented on pull request #5672: Add SelectionQuerySegmentPruner to prune segments for simple selection queries

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Jackie-Jiang commented on pull request #5672:
URL: https://github.com/apache/incubator-pinot/pull/5672#issuecomment-656960636


   > Does the `LIMIT 0` query response just contains the projected columns or all columns from schema? If so, do we even need one segment there? We can simply refer to the schema for columns and data types?
   
   @mayankshriv `LIMIT 0` query might contain columns and transform functions. So we still need to keep one segment to construct the TransformOperator in order to get all column types. No actual data fetch is required for that single segment.


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