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https://issues.apache.org/jira/browse/PIG-5370?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16702822#comment-16702822
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Daniel Dai commented on PIG-5370:
---------------------------------
+1, sounds good to me.
> Union onschema + columnprune dropping used fields
> --------------------------------------------------
>
> Key: PIG-5370
> URL: https://issues.apache.org/jira/browse/PIG-5370
> Project: Pig
> Issue Type: Bug
> Reporter: Koji Noguchi
> Assignee: Koji Noguchi
> Priority: Major
> Attachments: pig-5370-v1.patch
>
>
> After PIG-5312, below query started failing.
> {code}
> A = load 'input.txt' as (a1:int, a2:chararray, a3:int);
> B = FOREACH (GROUP A by (a1,a2)) {
> A_FOREACH = FOREACH A GENERATE a2,a3;
> GENERATE A, FLATTEN(A_FOREACH) as (a2,a3);
> }
> C = load 'input2.txt' as (A:bag{tuple:(a1: int,a2: chararray,a3:int)},a2:
> chararray,a3:int);
> D = UNION ONSCHEMA B, C;
> dump D;
> {code}
> {code:title=input1.txt}
> 1 a 3
> 2 b 4
> 2 c 5
> 1 a 6
> 2 b 7
> 1 c 8
> {code}
> {code:title=input2.txt}
> {(10,a0,30),(20,b0,40)} zzz 222
> {code}
> {noformat:title=Expected output}
> ({(10,a0,30),(20,b0,40)},zzz,222)
> ({(1,a,6),(1,a,3)},a,6)
> ({(1,a,6),(1,a,3)},a,3)
> ({(1,c,8)},c,8)
> ({(2,b,7),(2,b,4)},b,7)
> ({(2,b,7),(2,b,4)},b,4)
> ({(2,c,5)},c,5)
> {noformat}
> {noformat:title=Actual (incorrect) output}
> ({(10,a0,30),(20,b0,40)}) ****ONLY 1 Field ****
> ({(1,a,6),(1,a,3)},a,6)
> ({(1,a,6),(1,a,3)},a,3)
> ({(1,c,8)},c,8)
> ({(2,b,7),(2,b,4)},b,7)
> ({(2,b,7),(2,b,4)},b,4)
> ({(2,c,5)},c,5)
> {noformat}
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