Wes McKinney created ARROW-3121:
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Summary: [C++] Incremental Mean aggregator
Key: ARROW-3121
URL: https://issues.apache.org/jira/browse/ARROW-3121
Project: Apache Arrow
Issue Type: New Feature
Components: C++
Reporter: Wes McKinney-- This message was sent by Atlassian JIRA (v7.6.3#76005)
