[jira] [Assigned] (SPARK-30658) Limit after on streaming dataframe before streaming agg returns wrong results

["Tathagata Das (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-30658?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tathagata Das reassigned SPARK-30658:
-------------------------------------

    Assignee: Tathagata Das

> Limit after on streaming dataframe before streaming agg returns wrong results
> -----------------------------------------------------------------------------
>
>                 Key: SPARK-30658
>                 URL: https://issues.apache.org/jira/browse/SPARK-30658
>             Project: Spark
>          Issue Type: Bug
>          Components: Structured Streaming
>    Affects Versions: 2.3.0, 2.3.1, 2.3.2, 2.3.3, 2.3.4, 2.4.0, 2.4.1, 2.4.2, 2.4.3, 2.4.4
>            Reporter: Tathagata Das
>            Assignee: Tathagata Das
>            Priority: Critical
>             Fix For: 3.0.0
>
>
> Limit before a streaming aggregate (i.e. [[df.limit(5).groupBy().count()}}) in complete mode was not being planned as a streaming limit. The planner rule planned a logical limit with a stateful streaming limit plan only if the query is in append mode. As a result, instead of allowing max 5 rows across batches, the planned streaming query was allowing 5 rows in every batch thus producing incorrect results.



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