Hi,
Thanks to all who respnoded to the WITH RECURSIVE patches V0.1. Here
are TODO items so far. Lines starting with "*" are my comments and
questions.
- SEARCH clause not supported
* do weed this for 8.4?
- CYCLE clause not supported
* do weed this for 8.4?
- the number of "partition" is limited to up to 1
* do weed this for 8.4?
- "non_recursive_term UNION recursive_term" is not supported. Always UNION ALL" is requried. (i.e. "non_recursive_term
UNIONALL recursive_term" is supported)
* do weed this for 8.4?
- mutually recursive queries are not supported
* do weed this for 8.4?
- mutually recursive queries are not detected
* do weed this for 8.4?
- cost of Recursive Scan is always 0
- infinit recursion is not detected
* Tom suggested let query cancel and statement_timeout handle it.
- only the last SELECT of UNION ALL can include self recursion name
- outer joins for recursive name and tables does not work
- need regression tests
- need docs (at least SELECT reference manual)
- some queries crash. Examples are following:
--non recursive term only case: crashed with V0.1 patches
WITH RECURSIVE subdepartment AS
( -- non recursive term SELECT * FROM department WHERE name = 'A'
)
SELECT * FROM subdepartment ORDER BY name;
-- recursive term only case: crashed with V0.1 patches
WITH RECURSIVE subdepartment AS
( -- recursive term SELECT sd.level + 1, d.* FROM department AS d, subdepartment AS sd WHERE d.parent_department =
sd.id
)
SELECT * FROM subdepartment ORDER BY name;
--
Tatsuo Ishii
SRA OSS, Inc. Japan
