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)
         Function materialize (children 1)
          ExpressionList (children 1)
           Literal NULL
       Literal UInt64_1
     Literal Tuple_(UInt64_1, UInt64_1)
