[jira] [Resolved] (SPARK-20296) UnsupportedOperationChecker text on distinct aggregations differs from docs

["Sean Owen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-20296?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sean Owen resolved SPARK-20296.
-------------------------------
       Resolution: Fixed
    Fix Version/s: 2.1.2
                   2.2.0

Issue resolved by pull request 17609
[https://github.com/apache/spark/pull/17609]

> UnsupportedOperationChecker text on distinct aggregations differs from docs
> ---------------------------------------------------------------------------
>
>                 Key: SPARK-20296
>                 URL: https://issues.apache.org/jira/browse/SPARK-20296
>             Project: Spark
>          Issue Type: Documentation
>          Components: Structured Streaming
>    Affects Versions: 2.1.0
>            Reporter: Jason Tokayer
>            Priority: Trivial
>             Fix For: 2.2.0, 2.1.2
>
>
> In the unsupported operations section in the docs https://spark.apache.org/docs/latest/structured-streaming-programming-guide.html it states that "Distinct operations on streaming Datasets are not supported.". However, in ```org.apache.spark.sql.catalyst.analysis.UnsupportedOperationChecker.scala```, the error message is ```Distinct aggregations are not supported on streaming DataFrames/Datasets, unless it is on aggregated DataFrame/Dataset in Complete output mode. Consider using approximate distinct aggregation```.
> It seems that the error message is incorrect.



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