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https://issues.apache.org/jira/browse/SPARK-7768?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15303205#comment-15303205
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Patrick Grandjean commented on SPARK-7768:
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This seems promising:
https://github.com/apache/spark/blob/branch-2.0/sql/catalyst/src/main/scala/org/apache/spark/sql/types/UDTRegistration.scala
> Make user-defined type (UDT) API public
> ---------------------------------------
>
> Key: SPARK-7768
> URL: https://issues.apache.org/jira/browse/SPARK-7768
> Project: Spark
> Issue Type: New Feature
> Components: SQL
> Reporter: Xiangrui Meng
> Priority: Critical
>
> As the demand for UDTs increases beyond sparse/dense vectors in MLlib, it
> would be nice to make the UDT API public in 1.5.
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