Jackie-Jiang opened a new pull request #5115: Refactor the data source to 
include all information needed for query execution
URL: https://github.com/apache/incubator-pinot/pull/5115
 
 
   Currently query execution engine uses metadata from both data source
   and column metadata to process the segment. It works fine for
   immutable segment, but for mutable segment (real-time consuming
   segment), column metadata does not exist, thus multiple features such
   as segment pruning cannot be applied to the mutable segment.
   
   This PR adds the missing metadata from column metadata into the data
   source so that they become accessible for mutable segment, e.g.
   min/max value, partition info. Next PR will switch the engine to work
   purely on data source.

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