SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function equals (children 1)
     ExpressionList (children 2)
      Function length (children 1)
       ExpressionList (children 1)
        Function HMAC (children 1)
         ExpressionList (children 3)
          Literal \'sha256\'
          Literal \'message\'
          Literal \'\'
      Literal UInt64_32
