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Commit d292f748 authored by JihongMa's avatar JihongMa Committed by Xiangrui Meng
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[SPARK-11420] Updating Stddev support via Imperative Aggregate

switched stddev support from DeclarativeAggregate to ImperativeAggregate.

Author: JihongMa <linlin200605@gmail.com>

Closes #9380 from JihongMA/SPARK-11420.
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