Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/18257
Sure!
First of all, this handles another invalid case, Range(0,0).
Second, although we fix the generated codes in the reported in SPARK-21041,
we still generate **No-Op** code.
Third, this PR removes the usuless No-Op codegen and Janino compilation and
so on. This also will cowork with the other optimizer like
PripagateEmptyRelation.
Finally, we can simplify the underlying logic later by preventing this kind
of corner cases as eariler as possible.
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