DescribeQuery (children 1)
 TableExpression (children 1)
  Subquery (children 1)
   SelectWithUnionQuery (children 1)
    ExpressionList (children 1)
     SelectQuery (children 1)
      ExpressionList (children 2)
       Function plus (children 1)
        ExpressionList (children 2)
         Literal UInt64_1
         Literal UInt64_1
       Function concat (children 1)
        ExpressionList (children 2)
         Literal \'Value_1\'
         Literal \'Value_2\'