[jira] [Resolved] (SPARK-37822) SQL function `split` should return an array of non-nullable elements

["Wenchen Fan (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-37822?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wenchen Fan resolved SPARK-37822.
---------------------------------
    Fix Version/s: 3.3.0
       Resolution: Fixed

Issue resolved by pull request 35111
[https://github.com/apache/spark/pull/35111]

> SQL function `split` should return an array of non-nullable elements
> --------------------------------------------------------------------
>
>                 Key: SPARK-37822
>                 URL: https://issues.apache.org/jira/browse/SPARK-37822
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 3.2.0
>            Reporter: Shardul Mahadik
>            Assignee: Shardul Mahadik
>            Priority: Major
>             Fix For: 3.3.0
>
>
> Currently, {{split}} [returns the data type|https://github.com/apache/spark/blob/08dd010860cc176a33073928f4c0780d0ee98a08/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/regexpExpressions.scala#L532] {{ArrayType(StringType)}} which means the resultant array can contain nullable elements. However I do not see any case where the array can contain nulls.
> In the case where either the provided string or delimiter is NULL, the output will be a NULL array. In case of empty string or no chars between delemiters, the output array will contain empty strings but never NULLs. So I propose we change the return type of {{split}} to mark elements as non-null.



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