[PIG-2286] Using COR function in Piggybank results in ERROR 2018: Internal error. Unable to introduce the combiner for optimization

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.9.0
• Fix Version/s: 0.9.1, 0.10.0
• Component/s: impl, piggybank
• Hadoop Flags: Reviewed
• Assignee: Daniel Dai
• Reporter: Viraj Bhat
• Created: 15/Sep/11 00:04
• Updated: 05/Oct/11 17:20
• Resolved: 21/Sep/11 21:47

Description

Usage of the COR function in a Pig script, results in an error. The "studenttab5" contains student, age and gpa separated by "tab".

register /home/viraj/pig-svn/trunk/contrib/piggybank/java/piggybank.jar;
A = LOAD '/user/viraj/studenttab5' AS (name, age:double,gpa:double);
B = group A all;
C = foreach B generate group, COR(A.a, A.b);
dump C;

2011-09-14 17:03:22,001 [main] INFO org.apache.pig.backend.hadoop.executionengine.HExecutionEngine - Connecting to hadoop file system at: hdfs://localhost:9000
2011-09-14 17:03:22,088 [main] INFO org.apache.pig.backend.hadoop.executionengine.HExecutionEngine - Connecting to map-reduce job tracker at: localhost:9001
2011-09-14 17:03:22,960 [main] INFO org.apache.pig.tools.pigstats.ScriptState - Pig features used in the script: GROUP_BY
2011-09-14 17:03:23,168 [main] INFO org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MRCompiler - File concatenation threshold: 100 optimistic? false
2011-09-14 17:03:23,179 [main] INFO org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.CombinerOptimizer - Choosing to move algebraic foreach to combiner
2011-09-14 17:03:23,186 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR 2018: Internal error. Unable to introduce the combiner for optimization.

Viraj