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https://issues.apache.org/jira/browse/PIG-304?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12612939#action_12612939
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Alan Gates commented on PIG-304:
--------------------------------
The problem is more general in nature than just distinct. Queries such as the
following do not work either:
a = load '/Users/gates/test/data/studenttab10' as (name, age, gpa);
b = load '/Users/gates/test/data/votertab10' as (name, age, registration,
contributions);
c = filter a by age < 50;
d = filter b by age < 50;
e = cogroup c by (name, age), d by (name, age) ;
f = foreach e generate flatten(c), flatten(d);
g = group f by registration;
h = foreach g generate group, SUM(f.d::contributions);
i = order h by $1;
dump i;
The same erro is seen at the second grouping (alias g).
> Distinct fail if previous map plan is closed
> --------------------------------------------
>
> Key: PIG-304
> URL: https://issues.apache.org/jira/browse/PIG-304
> Project: Pig
> Issue Type: Bug
> Components: impl
> Affects Versions: types_branch
> Reporter: Daniel Dai
> Fix For: types_branch
>
> Attachments: distinct.patch
>
>
> Distinct will fail when the previous map plan is closed. For example, the
> following script fail:
> a = load 'a';
> b = group a by $0;
> c = foreach b generate $1;
> d = distinct c;
> dump d;
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