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https://issues.apache.org/jira/browse/SPARK-7911?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14562233#comment-14562233
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Apache Spark commented on SPARK-7911:
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User 'mengxr' has created a pull request for this issue:
https://github.com/apache/spark/pull/6442
> A workaround for VectorUDT serialize (or deserialize) being called multiple
> times
> ---------------------------------------------------------------------------------
>
> Key: SPARK-7911
> URL: https://issues.apache.org/jira/browse/SPARK-7911
> Project: Spark
> Issue Type: Improvement
> Components: MLlib
> Affects Versions: 1.4.0
> Reporter: Xiangrui Meng
> Assignee: Xiangrui Meng
>
> There are bugs in UDT serialization because we don't have a clear separation
> between internal SQL types and language specific types (including UDT). UDT
> serialize and deserialize may get called twice. A workaround is to accept Row
> in serialize and Vector in deserialize, though this doesn't completely solve
> the issue.
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