[jira] [Resolved] (SPARK-32501) Inconsistent NULL conversions to strings

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

     [ https://issues.apache.org/jira/browse/SPARK-32501?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wenchen Fan resolved SPARK-32501.
---------------------------------
    Fix Version/s: 3.1.0
       Resolution: Fixed

Issue resolved by pull request 29311
[https://github.com/apache/spark/pull/29311]

> Inconsistent NULL conversions to strings 
> -----------------------------------------
>
>                 Key: SPARK-32501
>                 URL: https://issues.apache.org/jira/browse/SPARK-32501
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 3.1.0
>            Reporter: Maxim Gekk
>            Assignee: Maxim Gekk
>            Priority: Major
>             Fix For: 3.1.0
>
>
> 1. It is impossible to distinguish empty string and null, for instance:
> {code:scala}
> scala> Seq(Seq(""), Seq(null)).toDF().show
> +-----+
> |value|
> +-----+
> | []|
> | []|
> +-----+
> {code}
> 2. Inconsistent NULL conversions for top-level values and nested columns, for instance:
> {code:scala}
> scala> sql("select named_struct('c', null), null").show
> +---------------------+----+
> |named_struct(c, NULL)|NULL|
> +---------------------+----+
> | []|null|
> +---------------------+----+
> {code}
> 3. `.show()` is different from conversions to Hive strings, and as a consequence its output is different from `spark-sql` (sql tests):
> {code:sql}
> spark-sql> select named_struct('c', null) as struct;
> {"c":null}
> {code}
> {code:scala}
> scala> sql("select named_struct('c', null) as struct").show
> +------+
> |struct|
> +------+
> | []|
> +------+
> {code}



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