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From "Daniel Dai (JIRA)" <j...@apache.org>
Subject [jira] Created: (PIG-1193) Secondary sort issue on nested desc sort
Date Fri, 15 Jan 2010 22:56:54 GMT
Secondary sort issue on nested desc sort
----------------------------------------

                 Key: PIG-1193
                 URL: https://issues.apache.org/jira/browse/PIG-1193
             Project: Pig
          Issue Type: Bug
          Components: impl
    Affects Versions: 0.6.0
            Reporter: Daniel Dai
            Assignee: Daniel Dai
             Fix For: 0.6.0


Secondary sort doing nested desc sort order incorrectly if the following conditions meet:

1. We have sort and UDF in nested plan
2. This UDF will use the same input tuples more than once
3. The input tuples are sorted in desc order

Here is a test case:
{code}
register sequence.jar;
A = load 'input' as (a0:int);
B = group A ALL;
C = foreach B {
    D = order A by a0 desc;
    generate sequence.CUMULATIVE(D,D);
};
dump C;
{code}

input file:
{code}
3
4
{code}

The input for the UDF is:
{code}
({(4),(3)},{(3),(4)})
{code}

The first bag is sorted desc, but the second is not.

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