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Date: Thu, 26 Jan 2017 16:00:28 +0000 (UTC)
From: "Herman van Hovell (JIRA)" <jira@apache.org>
To: issues@spark.apache.org
Message-ID: <JIRA.12972345.1464086230000.3772.1485446428356@Atlassian.JIRA>
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Subject: [jira] [Commented] (SPARK-15505) Explode nested Array in DF Column
 into Multiple Columns
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archived-at: Thu, 26 Jan 2017 16:00:39 -0000


    [ https://issues.apache.org/jira/browse/SPARK-15505?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15839908#comment-15839908 ] 

Herman van Hovell commented on SPARK-15505:
-------------------------------------------

Hmmmm.... This is will be quite bad in terms of performance. To me the usefulness also seems a bit limited, you cannot really reason about the structure of the data frame after doing this. Why would this be useful?

> Explode nested Array in DF Column into Multiple Columns 
> --------------------------------------------------------
>
>                 Key: SPARK-15505
>                 URL: https://issues.apache.org/jira/browse/SPARK-15505
>             Project: Spark
>          Issue Type: Improvement
>          Components: Spark Core
>    Affects Versions: 1.6.1
>            Reporter: Jorge Machado
>            Priority: Minor
>
> At the moment if we have a DF like this : 
> {noformat}
> +------+---------+
> | Col1 | Col2    |
> +------+---------+
> |  1   |[2, 3, 4]|
> |  1   |[2, 3, 4]|
> +------+---------+
> {noformat}
> There is no way to directly transform it into : 
> {noformat}
> +------+------+------+------+
> | Col1 | Col2 | Col3 | Col4 |
> +------+------+------+------+
> |  1   |  2   |  3   |  4   |
> |  1   |  2   |  3   |  4   |
> +------+------+------+------+ 
> {noformat}
> I think this should be easy to implement
> More infos here : http://stackoverflow.com/questions/37391241/explode-spark-columns/37392793#37392793


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