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https://issues.apache.org/jira/browse/SPARK-20783?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16092892#comment-16092892
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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/18468
> 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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