Github user twalthr commented on the issue:
https://github.com/apache/flink/pull/2454
It seems that Calcite is planning to add additional clauses to the SQL
statement. Like `SELECT STREAM x FROM y EMIT xyz`. If we really remove the
keyword we have to make sure that Calcite's parser will also parse `EMIT`
without the `STREAM` keyword.
@fhueske what do you think?
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