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https://issues.apache.org/jira/browse/PIG-4269?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14387614#comment-14387614
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Mohit Sabharwal commented on PIG-4269:
--------------------------------------

[~kellyzly], looks like the POSort is being removed from MR plan as part of 
SecondaryKeyOptimizerMR:

https://github.com/apache/pig/blob/8294883c9f6798be2871ca513a266f51cc1e9614/src/org/apache/pig/backend/hadoop/executionengine/util/SecondaryKeyOptimizerUtil.java#L352

If the extra POSort is indeed the root cause of 
TestAccumulator#testAccumAfterNestedOp failure, then we may need to implement 
SecondaryKeyOptimizer for Spark.

It's not clear to me how your PIG-4438 patch is addressing the failure.

> Enable unit test "TestAccumulator" for spark
> --------------------------------------------
>
>                 Key: PIG-4269
>                 URL: https://issues.apache.org/jira/browse/PIG-4269
>             Project: Pig
>          Issue Type: Sub-task
>          Components: spark
>            Reporter: liyunzhang_intel
>            Assignee: liyunzhang_intel
>             Fix For: spark-branch
>
>         Attachments: PIG-4269.patch, PIG-4269_1.patch, PIG-4269_Jekins.png, 
> TEST-org.apache.pig.test.TestAccumulator.txt
>
>
> error log is attached



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