tsreaper commented on pull request #16740:
URL: https://github.com/apache/flink/pull/16740#issuecomment-896465161


   I've checked this issue again and found that adding tests to 
`ScalarFunctionsTest.scala` is not enough. This is because function test use 
the generated function code directly and will not check for the return type of 
the function. So you may also need to add some tests in 
`org.apache.flink.table.planner.runtime.batch.sql.CalcITCase`.
   
   Also there are CI failures. Please keep an eye on the comment of @flinkbot 
for the results. If there are CI failures then the PR will never be merged.


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