SparkQA commented on issue #23434: [SPARK-22951][SQL][BRANCH-2.2] fix aggregation after dropDuplicates on empty dataframes URL: https://github.com/apache/spark/pull/23434#issuecomment-451055195 **[Test build #100668 has started](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/100668/testReport)** for PR 23434 at commit [`a23dfb7`](https://github.com/apache/spark/commit/a23dfb7dcf8805c3d6d5cbc2b5390a7f38076a02).
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