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https://issues.apache.org/jira/browse/SPARK-15144?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15369124#comment-15369124
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Hyukjin Kwon commented on SPARK-15144:
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Sorry, i missed this comment..
It seems SPARK-16460 has a example related with this.
> option nullValue for CSV data source not working for several types.
> -------------------------------------------------------------------
>
> Key: SPARK-15144
> URL: https://issues.apache.org/jira/browse/SPARK-15144
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.0.0
> Reporter: Hyukjin Kwon
>
> {{nullValue}} option does not work for the types, {{BooleanType}},
> {{TimestampType}}, {{DateType}} and {{StringType}}.
> So, currently there is no way to read {{null}} for those types.
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