Casting does not work in certain cases with multiple loads
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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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