SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function substring (children 1)
     ExpressionList (children 3)
      Function toFixedString (children 1)
       ExpressionList (children 2)
        Literal \'hello\'
        Literal UInt64_16
      Literal UInt64_1
      Literal UInt64_8