> > Thus I think we should avoid this kind of ORDER BY. Probably we should
> > avoid LIMIT/OFFSET and FOR UPDATE as well.
>
> What of index-optimized SELECT max(...) ?
Aggregate functions in a recursive term is prohibited by the
standard. For example,
WITH RECURSIVE x(n) AS (SELECT 1 UNION ALL SELECT max(n) FROM x)
SELECT * FROM x;
produces an error.
--
Tatsuo Ishii
SRA OSS, Inc. Japan
