Github user maropu commented on the issue:
https://github.com/apache/spark/pull/18768
@viirya I've no idea about a way to add tests for this kind of cases and I
think the previous prs similar to this case (just add code for warning) also
had no test. But, if we could, we'd better to do...
@gatorsmile I checked these Hive classes and I found some other functions
that Spark currently ignores... (e.g., `GenericUDF.getRequiredJars`,
`GenericUDF.close`...). Also, Spark currently invokes the deprecated
`initialize` interface only in `GenericUDTF`, so users get stuck if they use
the non-deprecated `initialize` interface. (See:
https://github.com/apache/spark/pull/18527). As you suggested above, it seems
we better leave some documents about these unsupported behaviours.
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