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https://issues.apache.org/jira/browse/SPARK-11360?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Armbrust resolved SPARK-11360.
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Resolution: Fixed
Fix Version/s: 1.6.0
Issue resolved by pull request 9314
[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
> Priority: Minor
> Fix For: 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/user@spark.apache.org/msg39230.html
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