Github user julianhyde commented on the pull request:
https://github.com/apache/drill/pull/439#issuecomment-200946428
Calcite allows strings to be implicitly converted to DATE and TIMESTAMP
values in comparisons, as does the SQL standard. Even if, as @jinfengni says,
the standard does not allow implicit conversion when comparing a DATE and
TIMESTAMP, it still seems a reasonable thing to do.
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