SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 2)
    Function toDecimal64 (alias x) (children 1)
     ExpressionList (children 2)
      Literal \'65536\'
      Literal UInt64_4
    Function toUInt16 (children 1)
     ExpressionList (children 1)
      Identifier x