Github user twalthr commented on the issue:
https://github.com/apache/flink/pull/2319
@fhueske I updated the PR. It is now in a mergable state. I had to disable
automatic flattening as it flattens types but does no unflattening. So if a
composite type enters the Table API it can never leave it untouched. The SQL
value construction `ROW(value, value)` does not work without flattening
anymore, we have to create an optimizer rule or something similar to flatten
this specific type. I will create a followup issue, once this is merged.
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