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