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

["Dongjoon Hyun (JIRA)" <ji...@apache.org>]

Dongjoon Hyun created SPARK-19910:
-------------------------------------

             Summary: `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: 2.1.0, 2.0.1, 2.0.0
            Reporter: Dongjoon Hyun


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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