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https://issues.apache.org/jira/browse/SPARK-8961?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14621285#comment-14621285
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Apache Spark commented on SPARK-8961:
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User 'liancheng' has created a pull request for this issue:
https://github.com/apache/spark/pull/7331
> Makes BaseWriterContainer.outputWriterForRow accepts InternalRow instead of
> Row
> -------------------------------------------------------------------------------
>
> Key: SPARK-8961
> URL: https://issues.apache.org/jira/browse/SPARK-8961
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.4.0, 1.4.1
> Reporter: Cheng Lian
> Assignee: Cheng Lian
>
> This is a follow-up of SPARK-8888, which also aims to optimize writing
> dynamic partitions.
> Three more changes can be made here:
> # Using {{InternalRow}} instead of {{Row}} in
> {{BaseWriterContainer.outputWriterForRow}}
> # Using {{Cast}} expressions to convert partition columns to strings, so that
> we can leverage code generation.
> # Replacing the FP-style {{zip}} and {{map}} calls with a faster imperative
> {{while}} loop.
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