matriv commented on pull request #18582:
URL: https://github.com/apache/flink/pull/18582#issuecomment-1028768386


   > Just one question, what about TIME to TIME and DATE to DATE? No trimming 
is happening there among precisions?
   
   The fractional seconds for `TIME` are broken, that's why we didn't have any 
rule for this, and instead it falls to the identity rule. There is already: 
https://issues.apache.org/jira/browse/FLINK-17224 and the relevant tests in 
`CastFunctionITCase` are marked, to be fixed when the issue is addressed. So it 
will be done at a later stage.


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