postgres

Commit Graph

Author	SHA1	Message	Date
Tom Lane	0d115dde82	Extend CTE patch to support recursive UNION (ie, without ALL). The implementation uses an in-memory hash table, so it will poop out for very large recursive results ... but the performance characteristics of a sort-based implementation would be pretty unpleasant too.	17 years ago
Tom Lane	44d5be0e53	Implement SQL-standard WITH clauses, including WITH RECURSIVE. There are some unimplemented aspects: recursive queries must use UNION ALL (should allow UNION too), and we don't have SEARCH or CYCLE clauses. These might or might not get done for 8.4, but even without them it's a pretty useful feature. There are also a couple of small loose ends and definitional quibbles, which I'll send a memo about to pgsql-hackers shortly. But let's land the patch now so we can get on with other development. Yoshiyuki Asaba, with lots of help from Tatsuo Ishii and Tom Lane	17 years ago

Author

SHA1

Message

Date

Tom Lane

0d115dde82

Extend CTE patch to support recursive UNION (ie, without ALL). The

implementation uses an in-memory hash table, so it will poop out for very
large recursive results ... but the performance characteristics of a
sort-based implementation would be pretty unpleasant too.

17 years ago

Tom Lane

44d5be0e53

Implement SQL-standard WITH clauses, including WITH RECURSIVE.

There are some unimplemented aspects: recursive queries must use UNION ALL
(should allow UNION too), and we don't have SEARCH or CYCLE clauses.
These might or might not get done for 8.4, but even without them it's a
pretty useful feature.

There are also a couple of small loose ends and definitional quibbles,
which I'll send a memo about to pgsql-hackers shortly.  But let's land
the patch now so we can get on with other development.

Yoshiyuki Asaba, with lots of help from Tatsuo Ishii and Tom Lane

17 years ago

2 Commits (87081b2d35057c4919a8a05a7c52fe87845874d5)