SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 2)
    Function toFixedString (alias x) (children 1)
     ExpressionList (children 2)
      Literal \'Hello, world!!!!\'
      Literal UInt64_16
    Function bitCount (children 1)
     ExpressionList (children 1)
      Identifier x