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https://issues.apache.org/jira/browse/SPARK-4318?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14204865#comment-14204865
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Apache Spark commented on SPARK-4318:
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User 'ueshin' has created a pull request for this issue:
https://github.com/apache/spark/pull/3184
> Fix empty sum distinct.
> -----------------------
>
> Key: SPARK-4318
> URL: https://issues.apache.org/jira/browse/SPARK-4318
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Reporter: Takuya Ueshin
>
> Executing sum distinct for empty table throws
> {{java.lang.UnsupportedOperationException: empty.reduceLeft}}.
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