HeartSaVioR commented on PR #59943:
URL: https://github.com/apache/spark/pull/59943#issuecomment-6514536245

   I'm not sure I understand the change. If I read the code correctly, we prune 
the columns "before" we run optimizer to inform the data source (Scan) that 
which columns are needed? That's weird. What are preventing us to push the 
column pruning down to the streaming source? (Honestly I thought we already 
supported it.)


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