SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function concat (children 1)
     ExpressionList (children 3)
      Function array (children 1)
       ExpressionList
      Literal Array_[\'Hello\']
      Function array (children 1)
       ExpressionList