Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/10577#discussion_r49784836 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/CatalystQl.scala --- @@ -393,8 +393,8 @@ https://cwiki.apache.org/confluence/display/Hive/Enhanced+Aggregation%2C+Cube%2C overwrite) } - // If there are multiple INSERTS just UNION them together into on query. - val query = queries.reduceLeft(Union) + // If there are multiple INSERTS just UNION them together into one query. + val query = if (queries.length == 1) queries.head else Union(queries) --- End diff -- now we will eliminate one-child `Union` during analysis, so it's ok to just return `Union` here
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