maryannxue commented on pull request #29726:
URL: https://github.com/apache/spark/pull/29726#issuecomment-792915413


   If I understand correctly (please make it clearer in your PR description), 
you are trying to enable DPP even if the filter is not broadcast-able but is 
small enough, I do not think it is a proper solution to hack through this 
"broadcastOnly" flag. Instead, you should improve the cost model in 
`pruningHasBenefit` in this PR and change the config `broadcastOnly` to `false` 
in your own application. And if you can further prove that with the improved 
cost model, you get performance improvement across the board, you can suggest 
flipping the default conf value in this PR or another follow-up one.


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