icefury71 commented on issue #4029: Failure to retrieve data after adding 
column to table schema. 
URL: 
https://github.com/apache/incubator-pinot/issues/4029#issuecomment-479708075
 
 
   I believe we need to enable this config in the servers 
"enable.default.columns=true" . This is necessary for the default columns to be 
populated for older segments:
   
   
https://github.com/apache/incubator-pinot/blob/master/pinot-core/src/main/java/org/apache/pinot/core/segment/index/loader/SegmentPreProcessor.java#L87

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