npawar commented on issue #5268: Filter during ingestion
URL: 
https://github.com/apache/incubator-pinot/issues/5268#issuecomment-615382688
 
 
   Initial thoughts:
   We need to think about where filtering will be applied.
   a) On source columns - should we fix that filtering is only on source fields?
   b) On transformed columns - Should we allow a column to evaluate the 
transform expression, and then apply filtering?
   c) Do we allow both?
   
   The answer to the above will decide where the filtering gets applied- within 
RecordExtractor/RecordReader, after Expression Transformer, after all 
transformers (i.e. after getting default null values, data type transformation 
etc).
   
   The config for this also needs to be designed. 

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