Jackie-Jiang commented on issue #5115: Refactor the data source to include all information needed for query execution URL: https://github.com/apache/incubator-pinot/pull/5115#issuecomment-595388794 > Can you describe a bit more on how would it look like in the end state?. Datasource is the leaf level block. Datasource usage must be restricted to the planning phase and execution should purely work on block and block metadata. Are we moving towards using datasource in execution phase? Datasource is the leaf level operator, and it should contain all the information needed for the query execution engine (include planing and execution). Query execution phase will still purely work on block, where the block metadata can be derived from the data source metadata. Here what I am trying to achieve is to move column metadata out of the query execution because it is not available in mutable segment.
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