Github user twalthr commented on the issue:
https://github.com/apache/flink/pull/2560
@wuchong I heavily tested this PR again as it could introduce difficult
bugs. And I also found one issue that needs to be discussed. If you have an
expression like `CAST(TRUE AS VARCHAR) || 'Test'` the result will be `TTest`
not `trueTest`. So the expression reduction has a different string
representation of boolean literals. The question is, do we wanna adapt our
code, can this be configured, or is Calcite doing something wrong? What do you
think @fhueske?
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