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From "Kazuaki Ishizaki (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-22472) Datasets generate random values for null primitive types
Date Wed, 08 Nov 2017 18:00:01 GMT

    [ https://issues.apache.org/jira/browse/SPARK-22472?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16244438#comment-16244438
] 

Kazuaki Ishizaki commented on SPARK-22472:
------------------------------------------

>From [the initial version|https://github.com/apache/spark/commit/9e66a53c9955285a85c19f55c3ef62db2e1b868a#diff-94a1f59bcc9b6758c4ca874652437634R227]
of this conversion (about two years ago), this conversion returns {{-1}}...

> Datasets generate random values for null primitive types
> --------------------------------------------------------
>
>                 Key: SPARK-22472
>                 URL: https://issues.apache.org/jira/browse/SPARK-22472
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.1.1, 2.2.0
>            Reporter: Vladislav Kuzemchik
>
> Not sure if it ever were reported.
> {code}
> scala> val s = sc.parallelize(Seq[Option[Long]](None,Some(1L),Some(5))).toDF("v")
> s: org.apache.spark.sql.DataFrame = [v: bigint]
> scala> s.show(false)
> +----+
> |v   |
> +----+
> |null|
> |1   |
> |5   |
> +----+
> scala> s.as[Long].map(v => v*2).show(false)
> +-----+
> |value|
> +-----+
> |-2   |
> |2    |
> |10   |
> +-----+
> scala> s.select($"v"*2).show(false)
> +-------+
> |(v * 2)|
> +-------+
> |null   |
> |2      |
> |10     |
> +-------+
> {code}



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