Github user zero323 commented on the issue:
https://github.com/apache/spark/pull/13571
@davies Jython is relatively mature and it has some applications (think
about Python UDFs with PIg) but it doesn't change the fact that it is years
behind CPython (no released 3.x branch for starters), slowish and painful to
use. Not to mention that for native libraries you need JyNI which is still in
alpha.
Moreover reasoning about PySpark dataflow is hard enough right now without
adding another place where things can blow.
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