Koji Noguchi created PIG-5335:

             Summary: Error message from range projection completely misleading
                 Key: PIG-5335
                 URL: https://issues.apache.org/jira/browse/PIG-5335
             Project: Pig
          Issue Type: Bug
            Reporter: Koji Noguchi
            Assignee: Koji Noguchi

A = load 'input.txt' as (a0,a1,a2,a3);
B = FOREACH A GENERATE a0, a1, a2, a3;
store B into '/tmp/deleteme';

C = FOREACH A GENERATE a0, b1, a2, a3;
(end of script, no store, nothing)

Error message
2018-04-10 10:22:33,360 \[main] ERROR org.apache.pig.PigServer - exception 
during parsing: Error during parsing. Invalid field projection. Projected field 
\[a0] does not exist in schema: 

At least two issues.
# Error should be about FOREACH for C referencing non-existing field 'b1'.  But 
the error message is saying something about 'a0'.
# Script itself is not using relation C and D at all.  It's confusing to see 
errors coming out of unused relations.

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