PERFORMANCE: enable combiner to be called 0 or more times whenver the combiner is used for a pig query ------------------------------------------------------------------------------------------------------
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. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.