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https://issues.apache.org/jira/browse/PIG-1439?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Richard Ding updated PIG-1439:
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Summary: [Performance] Create a single combiner class to aid MultiQuery
optimization (was: [Performance] Create a single combiner class to add
MultiQuery optimization )
> [Performance] Create a single combiner class to aid MultiQuery optimization
> ----------------------------------------------------------------------------
>
> Key: PIG-1439
> URL: https://issues.apache.org/jira/browse/PIG-1439
> Project: Pig
> Issue Type: Improvement
> Reporter: Richard Ding
>
> Right now Pig uses two combiner classes (PigCombiner & DistinctCombiner)
> respectively for group by and distinct operations. This prevents the
> MultiQueryOptimizer to merge jobs with different types of combiners. The
> proposal here is to merge these two combiners into a single Pig combiner so
> that the optimizer can merge group by jobs with distinct jobs.
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