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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