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https://issues.apache.org/jira/browse/PIG-1146?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Daniel Dai closed PIG-1146.
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> Inconsistent column pruning in LOUnion
> --------------------------------------
>
> Key: PIG-1146
> URL: https://issues.apache.org/jira/browse/PIG-1146
> Project: Pig
> Issue Type: Bug
> Components: impl
> Affects Versions: 0.6.0
> Reporter: Daniel Dai
> Assignee: Daniel Dai
> Fix For: 0.7.0
>
> Attachments: PIG-1146-1.patch, PIG-1146-2.patch
>
>
> This happens when we do a union on two relations, if one column comes from a
> loader, the other matching column comes from a constant, and this column get
> pruned. We prune for the one from loader and did not prune the constant. Thus
> leaves union an inconsistent state. Here is a script:
> {code}
> a = load '1.txt' as (a0, a1:chararray, a2);
> b = load '2.txt' as (b0, b2);
> c = foreach b generate b0, 'hello', b2;
> d = union a, c;
> e = foreach d generate $0, $2;
> dump e;
> {code}
> 1.txt:
> {code}
> ulysses thompson 64 1.90
> katie carson 25 3.65
> {code}
> 2.txt:
> {code}
> luke king 0.73
> holly davidson 2.43
> {code}
> expected output:
> (ulysses thompson,1.90)
> (katie carson,3.65)
> (luke king,0.73)
> (holly davidson,2.43)
> real output:
> (ulysses thompson,)
> (katie carson,)
> (luke king,0.73)
> (holly davidson,2.43)
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