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https://issues.apache.org/jira/browse/SPARK-20783?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16096306#comment-16096306
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Apache Spark commented on SPARK-20783:
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User 'kiszk' has created a pull request for this issue:
https://github.com/apache/spark/pull/18704

> Enhance ColumnVector to support compressed representation
> ---------------------------------------------------------
>
>                 Key: SPARK-20783
>                 URL: https://issues.apache.org/jira/browse/SPARK-20783
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL
>    Affects Versions: 2.3.0
>            Reporter: Kazuaki Ishizaki
>
> Current {{ColumnVector}} handles uncompressed data for parquet.
> For handling table cache, this JIRA entry adds {{OnHeapCachedBatch}} class to 
> have compressed data.
> As first step of this implementation, this JIRA supports primitive data and 
> string types.



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