Jackie-Jiang opened a new pull request #5144: Refactor value based segment 
pruner to work on DataSource instead of ColumnMetadata
URL: https://github.com/apache/incubator-pinot/pull/5144
 
 
   Motivation:
   ColumnMetadata is avaliable to immutable segments only. This change will 
make segment pruner work on mutable segments.
   
   Changes:
   1. Merge PartitionSegmentPruner into ColumnValueSegmentPruner to reduce the 
overhead of segment pruning
   2. Re-order segment pruners (ValidSegment -> DataSchema -> ColumnValue)

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