[jira] [Assigned] (SPARK-19910) `stack` should not reject NULL values due to type mismatch

["Apache Spark (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-19910?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-19910:
------------------------------------

    Assignee: Apache Spark

> `stack` should not reject NULL values due to type mismatch
> ----------------------------------------------------------
>
>                 Key: SPARK-19910
>                 URL: https://issues.apache.org/jira/browse/SPARK-19910
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.0.0, 2.0.1, 2.1.0
>            Reporter: Dongjoon Hyun
>            Assignee: Apache Spark
>
> Since `stack` function generates a table with nullable columns, it should allow mixed null values.
> {code}
> scala> sql("select stack(3, 1, 2, 3)").printSchema
> root
>  |-- col0: integer (nullable = true)
> scala> sql("select stack(3, 1, 2, null)").printSchema
> org.apache.spark.sql.AnalysisException: cannot resolve 'stack(3, 1, 2, NULL)' due to data type mismatch: Argument 1 (IntegerType) != Argument 3 (NullType); line 1 pos 7;
> 'Project [unresolvedalias(stack(3, 1, 2, null), None)]
> +- OneRowRelation$
> {code}



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