dongjoon-hyun edited a comment 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-451054965 This is a cherry-pick of #20174 and will be merged as @liufengdb 's commit. cc @liufengdb and @liancheng .
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