Github user chenghao-intel commented on the issue:
https://github.com/apache/spark/pull/16245
I think that's true in most of time for`Scala UDF needs extra conversion
between internal format and external format on input and out`, not all of the
time, for example, some built-in string based operations and its combinations
are also quite heavy in evaluation, and most likely, this probably causes
concern for an experienced SQL developers, to write an optimal(business related
short-cutting logic) SQL expressions.
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