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https://issues.apache.org/jira/browse/SPARK-11360?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14977548#comment-14977548
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Apache Spark commented on SPARK-11360:
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User 'gatorsmile' has created a pull request for this issue:
https://github.com/apache/spark/pull/9314
> Loss of nullability when writing parquet files
> ----------------------------------------------
>
> Key: SPARK-11360
> URL: https://issues.apache.org/jira/browse/SPARK-11360
> Project: Spark
> Issue Type: Documentation
> Components: Documentation
> Affects Versions: 1.5.0, 1.5.1
> Reporter: Xiao Li
> Fix For: 1.5.2, 1.5.3, 1.6.0
>
>
> When writing Parquet files, all columns are forced to be nullable for
> compatibility reasons.
> For details, see the discussion with Michael Armbrust in the mailing list:
> https://www.mail-archive.com/[email protected]/msg39230.html
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