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https://issues.apache.org/jira/browse/SPARK-11360?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14983738#comment-14983738
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Xiao Li commented on SPARK-11360:
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Hi, Sean,
I see. Thank you!
Xiao Li
> 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
>
> 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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