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https://issues.apache.org/jira/browse/SPARK-13574?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15172518#comment-15172518
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Apache Spark commented on SPARK-13574:
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User 'nongli' has created a pull request for this issue:
https://github.com/apache/spark/pull/11434
> Improve parquet dictionary decoding for strings
> -----------------------------------------------
>
> Key: SPARK-13574
> URL: https://issues.apache.org/jira/browse/SPARK-13574
> Project: Spark
> Issue Type: Improvement
> Reporter: Nong Li
> Priority: Minor
>
> Currently, the parquet reader will copy the dictionary value for each data
> value. This is bad for string columns as we explode the dictionary during
> decode. We should instead, have the data values point to the safe backing
> memory.
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