Github user jinfengni commented on the pull request:
https://github.com/apache/drill/pull/439#issuecomment-200907542
My understanding is adding another operator will not work, since Calcite
parser has put the built-in between operator in the sql expression tree[1]. The
validator logic will simply use the build-in operator, even we add another
operator.
[1]
https://github.com/apache/calcite/blob/master/core/src/main/codegen/templates/Parser.jj#L2564
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