Github user sunjincheng121 commented on the issue:
https://github.com/apache/flink/pull/3944
Hi, @twalthr In this PR. I want change the method `boolLiteral` of
`ExpressionParser`. @fhueske had a suggestion that we should add "true" and
"false" as keywords to the parser. Because Keywords are parsed
case-insensitive. And I appreciate If you can give us some suggestions.
Thanks,
SunJincheng
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