Github user fhueske commented on the issue:
https://github.com/apache/flink/pull/3107
Hmm, I think registering tables in `toString()` (which IMO should be free
of side effects) is not very clean, but I have to admit that the API looks
good. So, I would be OK doing this like that.
Would we also take care to unregister the tables after the query was
optimized?
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