Github user fhueske commented on the issue:
https://github.com/apache/flink/pull/4424
Hi @zhangminglei, thanks for the PR. The changes look OK.
However, I don't understand what causes the problem
`UserDefinedFunctionTestUtils` is not defined in
`org.apache.flink.table.utils._`. Are you on the latest `master` branch?
Thanks, Fabian
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