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https://issues.apache.org/jira/browse/SPARK-10915?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16065787#comment-16065787
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Erik Erlandson commented on SPARK-10915:
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This would be great for exposing {{TDigest}} aggregation to py-spark datasets.
(see https://github.com/isarn/isarn-sketches#t-digest)
Currently the newer {{Aggregator}} trait makes this easy to do for datasets in
Scala. Writing the alternative {{UserDefinedAggregateFunction}} is possible,
although I'd have to code my own serializor for a TDigest UDT instead of just
using {{Encoder.kryo}}. But UDAF to python is a hack at best: (see
https://stackoverflow.com/a/33257733/3669757)
> Add support for UDAFs in Python
> -------------------------------
>
> Key: SPARK-10915
> URL: https://issues.apache.org/jira/browse/SPARK-10915
> Project: Spark
> Issue Type: Improvement
> Components: PySpark, SQL
> Reporter: Justin Uang
>
> This should support python defined lambdas.
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