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The following page has been changed by PradeepKamath: http://wiki.apache.org/pig/PigMultiQueryPerformanceSpecification ------------------------------------------------------------------------------ Both of the above are equivalent, but the performance will be different. - Here's the multi-query feature does to increase the performance: + Here's what the multi-query feature does to increase the performance: * In the second case we add an implicit split to transform the query to case number one. That eliminates the processing of A' multiple times. * Make the split non-blocking and allow processing to continue. This helps to reduce the amount of data that has to be stored right at the split.