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From "Jungtaek Lim (Jira)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-28094) Multiple left joins or aggregations in one query produce incorrect results
Date Tue, 01 Oct 2019 10:03:00 GMT

    [ https://issues.apache.org/jira/browse/SPARK-28094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16941710#comment-16941710
] 

Jungtaek Lim commented on SPARK-28094:
--------------------------------------

SPARK-28074 is already merged so it will be included to Spark 3.0.0. SPARK-24634 is open for
reviewing but still struggle to find reviewers. I think I still have 4 months to include this
to Spark 3.0.0, so let's see.

> Multiple left joins or aggregations in one query produce incorrect results
> --------------------------------------------------------------------------
>
>                 Key: SPARK-28094
>                 URL: https://issues.apache.org/jira/browse/SPARK-28094
>             Project: Spark
>          Issue Type: Bug
>          Components: Structured Streaming
>    Affects Versions: 2.4.3
>            Reporter: Joe Ammann
>            Priority: Major
>
> Structured streaming queries which involve more than one non-map-like transformations
(either left joins or aggregations) produce incorrect (and sometimes inconsistent) results.
> I have put up a sample here as Gist https://gist.github.com/jammann/b58bfbe0f4374b89ecea63c1e32c8f17
> The test case involves 4 topics, and I've implement 6 different use cases of which 3
fail to produce the expected results
> 1) A innerjoin B: to topic A_B
> 	expected: 10 inner joined messages
>         observation: OK
> 2) A innerjoin B outerjoin C: to topic A_B_outer_C 
> 	expected: 9 inner joined messages, last one in watermark
>         observation: OK
> 3) A innerjoin B outerjoin C outerjoin D: to topic A_B_outer_C_outer_D
> 	expected: 9 inner/outer joined messages, 3 match C, 1 match D, last one in watermark
>         observation: NOK, only 3 messages are produced, where the C outer join matches
> 4) B outerjoin C: to topic B_outer_C 
> 	expected: 9 outer joined messages, 3 match C, 1 match D, last one in watermark
>         observation: NOK, same as 3
> 5) A innerjoin B agg on field of A: to topic A_inner_B_agg
> 	expected: 3 groups with a total of 9 inner joined messages, last one in watermark
>         observation: OK
> 6) A innerjoin B outerjoin C agg on field of A: to topic A_inner_B_outer_C_agg
> 	expected: 3 groups with a total of 9 inner joined messages, last one in watermark
>         observation: NOK, 3 groups with 1 message each, where C outer join matches



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