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https://issues.apache.org/jira/browse/SPARK-19671?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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liuxian closed SPARK-19671.
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> change 'var' to 'val' for better Specification
> ----------------------------------------------
>
> Key: SPARK-19671
> URL: https://issues.apache.org/jira/browse/SPARK-19671
> Project: Spark
> Issue Type: Improvement
> Components: Examples, Spark Core, SQL
> Affects Versions: 2.1.0
> Reporter: liuxian
>
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