amaliujia edited a comment on pull request #13898:
URL: https://github.com/apache/beam/pull/13898#issuecomment-780880231


   My suggestion is:
   1. if this PR's goal is to verify whether BeamCalRel is safe to run ZetaSQL 
operators, can you create a separate rule that allows ZetaSQL operators run in 
BeamCalRel(and reject those wrong cases)? 
   2. If this PR's goal is to help improve Java UDF, please hold this PR now. 
Kyle and I are discussing the next steps to improve current UDF implementation. 
This PR is a great reference to give us directions on where to check the 
implementation. We will need time to digest this PR and consider whether Calc 
splitting should go first. We will definitely consider this PR during our 
improving process. 


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