Github user cloud-fan commented on a diff in the pull request:

    https://github.com/apache/spark/pull/10577#discussion_r49799631
  
    --- Diff: 
sql/hive/src/main/scala/org/apache/spark/sql/hive/SQLBuilder.scala ---
    @@ -129,10 +129,13 @@ class SQLBuilder(logicalPlan: LogicalPlan, 
sqlContext: SQLContext) extends Loggi
             conditionSQL = condition.sql
           } yield s"$childSQL $whereOrHaving $conditionSQL"
     
    -    case Union(left, right) =>
    +    case Union(children) if children.length == 1 =>
    +      toSQL(children.head)
    --- End diff --
    
    this branch is not needed, `Union` will always have more than one child


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