This has been discussed before in the context of misunderstanding the meaning of 'iscachable', but I now have a use for cached function results, and have seen at least one other posting with a similar need.
The reason I need it is that I have a few functions that do recursive inheritance lookups going up a converging inheritance tree. Typically this function will be called on several hundred objects in a single select statement. Because of inheritance, it ends up with several thousand function calls, each of which is non-trivial. A solution that would be useful for me would be: If a function is marked 'invariant' (or something similar), then - cache the most recently used 20 calls (config item) iff the args were less than 1K in total storage (ie. don't cache large text blocks), - calculate a very simple checksum on the args - when a function is to be evaluated, calc the checksum and if a match is found, compare the args, and if they all match, return the result. I would anticipate deleting the cache when the current command exits, and/or certainly when a TX ends. Obviously this is not a 7.3 item, but would people support such functionality going into a future version? ---------------------------------------------------------------- Philip Warner | __---_____ Albatross Consulting Pty. Ltd. |----/ - \ (A.B.N. 75 008 659 498) | /(@) ______---_ Tel: (+61) 0500 83 82 81 | _________ \ Fax: (+61) 0500 83 82 82 | ___________ | Http://www.rhyme.com.au | / \| | --________-- PGP key available upon request, | / and from pgp5.ai.mit.edu:11371 |/ ---------------------------(end of broadcast)--------------------------- TIP 4: Don't 'kill -9' the postmaster
