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https://issues.apache.org/jira/browse/SPARK-25334?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16603341#comment-16603341
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Tomasz Gawęda commented on SPARK-25334:
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If commiters say it's not very important, I can start work on this. However, it
will probably take more time for me to implement it than for some that's
already a Spark committer :)
> Default SessionCatalog should support UDFs
> ------------------------------------------
>
> Key: SPARK-25334
> URL: https://issues.apache.org/jira/browse/SPARK-25334
> Project: Spark
> Issue Type: Task
> Components: SQL
> Affects Versions: 2.3.1
> Reporter: Tomasz Gawęda
> Priority: Major
>
> SessionCatalog calls registerFunction to add a function to function registry.
> However, makeFunctionExpression supports only UserDefinedAggregateFunction.
> We should make makeFunctionExpression support UserDefinedFunction, as it's
> one of functions type.
> Currently we can use persistent functions only with Hive metastore, but
> "create function" command works also with default SessionCatalog. It
> sometimes cause user confusion, like in
> https://stackoverflow.com/questions/52164488/spark-hive-udf-no-handler-for-udaf-analysis-exception/52170519
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