Jihong MA created SPARK-11420:
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Summary: Changing Stddev support with Imperative Aggregate
Key: SPARK-11420
URL: https://issues.apache.org/jira/browse/SPARK-11420
Project: Spark
Issue Type: Improvement
Components: ML, SQL
Reporter: Jihong MA
based on the performance comparison of Declaritive vs. Imperative Aggregate
(SPARK-10953), switching to Imerative aggregate for stddev.
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