Github user HyukjinKwon commented on the issue: https://github.com/apache/spark/pull/20900 The issue itself here (SPARK-23645) describes kwargs arguments support in both UDF and Pandas UDF on calling side. Seems not working but the fix looks going to be quite invasive and big. So, I suggested to fix the documentation for now. Maybe, we should revisit in the future. Let's monitor mailing list and JIRAs. https://github.com/apache/spark/pull/20900#issuecomment-376356469 with https://github.com/apache/spark/pull/20900#issuecomment-376357750 is a separate issue about partial functions and callable objects in Pandas UDF, I found during review.
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