[jira] [Resolved] (SPARK-21037) ignoreNulls does not working properly with window functions

["Hyukjin Kwon (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-21037?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hyukjin Kwon resolved SPARK-21037.
----------------------------------
    Resolution: Incomplete

> ignoreNulls does not working properly with window functions
> -----------------------------------------------------------
>
>                 Key: SPARK-21037
>                 URL: https://issues.apache.org/jira/browse/SPARK-21037
>             Project: Spark
>          Issue Type: Bug
>          Components: Optimizer
>    Affects Versions: 2.1.0, 2.1.1
>            Reporter: Stanislav Chernichkin
>            Priority: Major
>              Labels: bulk-closed
>
> Following code  reproduces issue:
> spark
>       .sql("select 0 as key, null as value, 0 as order union select 0 as key, 'value' as value, 1 as order")
>       .select($"*", first($"value", true).over(partitionBy($"key").orderBy("order")).as("first_value"))
>       .show()
> Since documentation climes than {{first}} function will return first non-null result I except to have: 
> |key|value|order|first_value|
> |  0| null|    0|       value|
> |  0|value|    1|      value|
> But actual result is: 
> |key|value|order|first_value|
> |  0| null|    0|       null|
> |  0|value|    1|      value|



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