[PIG-597] Pig does not handdle correctly the case where "*" is passed to UDF

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.2.0
• Assignee: Shravan Matthur Narayanamurthy
• Reporter: Olga Natkovich
• Created: 05/Jan/09 23:27
• Updated: 25/Mar/10 00:12
• Resolved: 17/Jan/09 00:30

Description

Script:
======
A = LOAD 'foo' USING PigStorage('\t');
B = FILTER A BY ARITY < 5;
DUMP B;

Error:
=====

2009-01-05 21:46:56,355 [main] ERROR
org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POUserFunc

• Caught error from UDF
  org.apache.pig.builtin.ARITY[org.apache.pig.data.DataByteArray cannot be cast to org.apache.pig.data.Tuple [org.apache.pig.data.DataByteArray cannot be cast to org.apache.pig.data.Tuple]

Problem:
=======

Santhosh tracked this to the following code in POUserFunc.java:

if(op instanceof POProject &&
op.getResultType() == DataType.TUPLE){
POProject projOp = (POProject)op;
if(projOp.isStar())

{ Tuple trslt = (Tuple) temp.result; Tuple rslt = (Tuple) res.result; for(int i=0;i<trslt.size();i++) rslt.append(trslt.get(i)); continue; }

}

It seems to be unwrapping the tuple before passing it to the function. There is no comments so we are not sure why it is there; will need to run tests to see if removing it would solve this issue and not create others.