SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Literal UInt64_1
   Function equals (children 1)
    ExpressionList (children 2)
     Function tuple (children 1)
      ExpressionList (children 2)
       Function assumeNotNull (children 1)
        ExpressionList (children 1)
         Literal NULL
       Literal UInt64_1
     Literal Tuple_(UInt64_1, UInt64_1)
