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From "Alan Gates (JIRA)" <j...@apache.org>
Subject [jira] Created: (PIG-335) Casting does not work in certain cases with multiple loads
Date Thu, 24 Jul 2008 18:29:31 GMT
Casting does not work in certain cases with multiple loads
----------------------------------------------------------

                 Key: PIG-335
                 URL: https://issues.apache.org/jira/browse/PIG-335
             Project: Pig
          Issue Type: Bug
          Components: impl
    Affects Versions: types_branch
            Reporter: Alan Gates
            Assignee: Santhosh Srinivasan
            Priority: Critical
             Fix For: types_branch


Given a script like:

A = load 'bla' as (x, y) using Loader1();
B = load 'morebla' as (s, t) using Loader2();
C = cogroup A by x, B by s;
D = foreach C generate flatten(A), flatten(B);
E = foreach D generate x, y, t + 1;

In this case, in the last foreach, a cast will need to be added to t + 1 to allow t (a byte
array) to be added to an integer.  We use load functions to handle this late casting.  The
issue is that we do not currently have a way to know whether to use Loader1 or Loader2 to
cast the data.  We need to track the lineage of fields so that the cast operator can select
the correct loader.


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