[jira] [Comment Edited] (SPARK-22472) Datasets generate random values for null primitive types

["Marco Gaido (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-22472?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16244310#comment-16244310 ] 

Marco Gaido edited comment on SPARK-22472 at 11/8/17 4:58 PM:
--------------------------------------------------------------

Two things:
 1 - if you use {{as\[Option\[Long\]\]}}, it works fine;
 2 - actually if you collect the Dataset, the value for {{null}} is {{0}}, but with the transformation, there is this bad result.

Then I am not sure about the right approach here. Because maybe the best thing would be to force using {{Option\[Long\]}} when the value is {{nullable}}, but this might be too restrictive and may break compatibility.


was (Author: mgaido):
Two things:
 1 - if you use `as[Option[Long]]`, it works fine;
 2 - actually if you collect the Dataset, the value for `null` is `0`, but with the transformation, there is this bad result.

Then I am not sure about the right approach here. Because maybe the best thing would be to force using `Option[Long]` when the value is `nullable`, but this might be too restrictive and may break compatibility.

> 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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