fsk119 commented on pull request #15307:
URL: https://github.com/apache/flink/pull/15307#issuecomment-813395188


   I just come back from the vacation. 
   
   For the comment, I think we can solve by merging the two Calc into one Calc 
with the rule `FlinkCalcMergeRule`.
   
   For the second prolem, I think you should take a look at 
`PushFilterIntoLegacyTableSourceScanRuleTest`. I think the new rule should at 
least pass the tests for `PushFilterIntoTableSourceScanRule`.


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