Julien Le Dem created PIG-2659:
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Summary: add source location of the aliases in the physical plan
Key: PIG-2659
URL: https://issues.apache.org/jira/browse/PIG-2659
Project: Pig
Issue Type: Improvement
Components: impl
Reporter: Julien Le Dem
Assignee: Julien Le Dem
The goal is to provide better information about what is actually running in a
job.
In particular when alias names are being reused.
For example with the following script:
{code}
A = LOAD 'foo' using PigStorage();
B = GROUP A BY $0;
A = FOREACH B GENERATE COUNT(A);
STORE A INTO 'bar';
{code}
The job conf will contain the following information
{code}
pig.alias.location: M: A[1,4],A[3,4],B[2,4] C: A[3,4],B[2,4] R: A[3,4]
{code}
A caveat is that the Logical Plan Optimizer throws away the original
information when merging Logical Operators.
this is already the case today with pig.alias
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