Github user fhueske commented on the issue:
https://github.com/apache/flink/pull/2653
Maybe one more thing to add. @twalthr recently added some tooling to write
unit tests that check the translation from SQL / Table API to `DataSetRel` and
`DataStreamRel` nodes, i.e., exclude the final translation into DataSet and
DataStream programs. See PR #2595.
A couple of ITCases could be replaced by such tests. We need of course a
few end-to-end tests nonetheless, but maybe not as many as currently.
I also noticed that there are not tests that check for correct failures,
e.g., check correct errors if a SQL query refers to a function in `FROM` that
has not been registered or which is a ScalarFunction.
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