Takuya Ueshin created SPARK-4318:
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Summary: 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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