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https://issues.apache.org/jira/browse/SPARK-14850?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15418534#comment-15418534
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Wenchen Fan commented on SPARK-14850:
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format your code please, it's unreadable
> VectorUDT/MatrixUDT should take primitive arrays without boxing
> ---------------------------------------------------------------
>
> Key: SPARK-14850
> URL: https://issues.apache.org/jira/browse/SPARK-14850
> Project: Spark
> Issue Type: Improvement
> Components: ML, SQL
> Affects Versions: 1.5.2, 1.6.1, 2.0.0
> Reporter: Xiangrui Meng
> Assignee: Wenchen Fan
> Priority: Critical
> Fix For: 2.0.0
>
>
> In SPARK-9390, we switched to use GenericArrayData to store indices and
> values in vector/matrix UDTs. However, GenericArrayData is not specialized
> for primitive types. This might hurt MLlib performance badly. We should
> consider either specialize GenericArrayData or use a different container.
> cc: [~cloud_fan] [~yhuai]
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