Jackie-Jiang commented on PR #9184:
URL: https://github.com/apache/pinot/pull/9184#issuecomment-1215497429

   `ExtractTransformFunction` will only be applied at query time. If we want to 
support ingestion transform, we need to add a `ScalarFunction` for the `extract 
(you may take a look at `DateTimeFunctions` class).
   
   To support this feature, we need 2 parts of the changes:
   1. Calcite parser change to support `extract` syntax and parse the query 
into `extract(field, expression)`
   2. Add `ExtractTransformFunction` or `ScalarFunction` to support 
query/ingestion time transform


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