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[SPARK-22223][SQL] ObjectHashAggregate should not introduce unnecessa…
…ry shuffle ## What changes were proposed in this pull request? `ObjectHashAggregateExec` should override `outputPartitioning` in order to avoid unnecessary shuffle. ## How was this patch tested? Added Jenkins test. Author: Liang-Chi Hsieh <viirya@gmail.com> Closes #19501 from viirya/SPARK-22223.
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