Github user HyukjinKwon commented on the pull request:
https://github.com/apache/spark/pull/8718#issuecomment-143179571
In this commit, it only deals with numbers. I removed the roundtrip in cast
and It only supports comparisons among other numeric types except `Decimal` and
between `Decimal` and `Decimal`
Otherwise it considers incompatible. e.g. (between `Decimal` and other
types except `Decimal`).
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