[jira] [Resolved] (SPARK-21590) Structured Streaming window start time should support negative values to adjust time zone

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

     [ https://issues.apache.org/jira/browse/SPARK-21590?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sean Owen resolved SPARK-21590.
-------------------------------
       Resolution: Fixed
    Fix Version/s: 2.4.0

Issue resolved by pull request 18903
[https://github.com/apache/spark/pull/18903]

> Structured Streaming window start time should support negative values to adjust time zone
> -----------------------------------------------------------------------------------------
>
>                 Key: SPARK-21590
>                 URL: https://issues.apache.org/jira/browse/SPARK-21590
>             Project: Spark
>          Issue Type: Improvement
>          Components: Structured Streaming
>    Affects Versions: 2.0.0, 2.0.1, 2.1.0, 2.2.0
>         Environment: spark 2.2.0
>            Reporter: Kevin Zhang
>            Assignee: Kevin Zhang
>            Priority: Major
>              Labels: spark-sql, spark2.2, streaming, structured, timezone, window
>             Fix For: 2.4.0
>
>
> I want to calculate (unique) daily access count using structured streaming (2.2.0). 
> Now strut streaming' s window with 1 day duration starts at 
> 00:00:00 UTC and ends at 23:59:59 UTC each day, but my local timezone is CST (UTC + 8 hours) and I
> want date boundaries to be 00:00:00 CST (that is 00:00:00 UTC - 8). 
> In Flink I can set the window offset to -8 hours to make it, but here in struct streaming if I set the start time (same as the offset in Flink) to -8 or any other negative values, I will get the following error:
> {code:java}
> Exception in thread "main" org.apache.spark.sql.AnalysisException: cannot resolve 'timewindow(timestamp, 86400000000, 86400000000, -28800000000)' due to data type mismatch: The start time (-28800000000) must be greater than or equal to 0.;;
> {code}
> because the time window checks the input parameters to guarantee each value is greater than or equal to 0.
> So I'm thinking about whether we can remove the limit that the start time cannot be negative?



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