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https://issues.apache.org/jira/browse/SPARK-13437?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15157574#comment-15157574
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Apache Spark commented on SPARK-13437:
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User 'kiszk' has created a pull request for this issue:
https://github.com/apache/spark/pull/11307
> Add InternalColumn
> ------------------
>
> Key: SPARK-13437
> URL: https://issues.apache.org/jira/browse/SPARK-13437
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Kazuaki Ishizaki
>
> To abstract a columnar storage, it would be good to introduce {{InternalRow}}
> as an analogy with {{InternalRow}}. This would allow us to use different
> implementations of column storage.
> For now, {{ColumnarVector}} extends {{InternalRow}}.
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