PERFORMANCE: enable combiner to be called 0 or more times whenver the combiner
is used for a pig query
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Key: PIG-563
URL: https://issues.apache.org/jira/browse/PIG-563
Project: Pig
Issue Type: Improvement
Affects Versions: types_branch
Reporter: Pradeep Kamath
Assignee: Pradeep Kamath
Fix For: types_branch
Currently Pig's use of the combiner assumes the combiner is called exactly once
in Hadoop. With Hadoop 18, the combiner could be called 0, 1 or more times.
This issue is to track changes needed in the CombinerOptimizer visitor and the
builtin Algebraic UDFS (SUM, COUNT, MIN, MAX, AVG) to be able to work in this
new model.
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