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https://issues.apache.org/jira/browse/SPARK-21588?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16113422#comment-16113422
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Burak Yavuz commented on SPARK-21588:
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[~vinodkc] [~aokolnychyi]
It happens when the config has a value converter, example
`spark.sql.shuffle.partitions`. Basically any non-string sql conf.
> SQLContext.getConf(key, null) should return null, but it throws NPE
> -------------------------------------------------------------------
>
> Key: SPARK-21588
> URL: https://issues.apache.org/jira/browse/SPARK-21588
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: Burak Yavuz
> Priority: Minor
>
> SQLContext.get(key) for a key that is not defined in the conf, and doesn't
> have a default value defined, throws a NoSuchElementException. In order to
> avoid that, I used a null as the default value, which threw a NPE instead. If
> it is null, it shouldn't try to parse the default value in `getConfString`
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