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https://issues.apache.org/jira/browse/PIG-4683?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14901576#comment-14901576
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Rohini Palaniswamy commented on PIG-4683:
-----------------------------------------
Few questions:
1) This is not an issue with Tez right?
2) If we are removing null checks in tuple, won't output be incorrect if
cogroup is on multiple keys and they contain null? Most likely there are no
test cases covering that scenario. I realized that with self joins for PIG-4627
and had to add/modify tests to use studentnulltab10k.
> Nested order is broken after PIG-3591 in some cases
> ---------------------------------------------------
>
> Key: PIG-4683
> URL: https://issues.apache.org/jira/browse/PIG-4683
> Project: Pig
> Issue Type: Bug
> Components: impl
> Reporter: Daniel Dai
> Assignee: Daniel Dai
> Fix For: 0.16.0, 0.15.1
>
> Attachments: PIG-4683-1.patch
>
>
> The following script fail after PIG-3591.
> {code}
> a = load '1.txt' using PigStorage(',') as (a0:chararray, a1:chararray);
> b = load '2.txt' as (b0:chararray);
> c = cogroup b by b0, a by a0;
> d = foreach c {
> a_sorted = order a by a1 desc;
> generate group, a_sorted, b;
> }
> dump d;
> {code}
> 1.txt
> a,0
> a,2
> a,1
> 2.txt
> a
> Expected:
> {code}
> (a,{(a,1),(a,2),(a,0)},{(a)})
> {code}
> Actual:
> {code}
> (a,{(a,2),(a,1),(a,0),(a)},{})
> {code}
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