Github user holdenk commented on the issue:
    So @rxin just commented with an explicit "Won't Fix" on the JIRA.
    @zero323 certainly Jython can be slow, but as the benchmark shows it can be 
much faster than our current Python UDF approach.
    @davies Some people have been actively using it in a similar use case 
(Python UDFs with Pig) (as @zero323 mentions).
    I'd rather try and find a way to expose this as a experimental API - but if 
the consesus is "Won't Fix" I'll put this on my back burner of things to 
contribute as a Spark Package (although the cost of maintaining Spark Packages 
is frustrating so I'll also take a look at adding it to one of the meta 
packages like Bahir if there is interest there). In the meantime I'll do some 
poking with arrow and also looking at pip install-ability since these seem to 
be of importance to much of the PySpark community.

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