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https://issues.apache.org/jira/browse/SPARK-24935?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16774170#comment-16774170
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Parth Gandhi commented on SPARK-24935:
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Thank you [~gavin_hu] for reporting the issue in the first place. Have sent an
email to the Spark dev mailing list requesting them to push the fix for Spark
2.4.1. Will let you know in case of any updates.
> Problem with Executing Hive UDF's from Spark 2.2 Onwards
> --------------------------------------------------------
>
> Key: SPARK-24935
> URL: https://issues.apache.org/jira/browse/SPARK-24935
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.2.0, 2.3.1
> Reporter: Parth Gandhi
> Priority: Major
>
> A user of sketches library(https://github.com/DataSketches/sketches-hive)
> reported an issue with HLL Sketch Hive UDAF that seems to be a bug in Spark
> or Hive. Their code runs fine in 2.1 but has an issue from 2.2 onwards. For
> more details on the issue, you can refer to the discussion in the
> sketches-user list:
> [https://groups.google.com/forum/?utm_medium=email&utm_source=footer#!msg/sketches-user/GmH4-OlHP9g/MW-J7Hg4BwAJ]
>
> On further debugging, we figured out that from 2.2 onwards, Spark hive UDAF
> provides support for partial aggregation, and has removed the functionality
> that supported complete mode aggregation(Refer
> https://issues.apache.org/jira/browse/SPARK-19060 and
> https://issues.apache.org/jira/browse/SPARK-18186). Thus, instead of
> expecting update method to be called, merge method is called here
> ([https://github.com/DataSketches/sketches-hive/blob/master/src/main/java/com/yahoo/sketches/hive/hll/SketchEvaluator.java#L56)]
> which throws the exception as described in the forums above.
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