2008/11/5 Peter Eisentraut <[EMAIL PROTECTED]>: > Pavel Stehule wrote: >> >> Hello >> >> 2008/11/5 Peter Eisentraut <[EMAIL PROTECTED]>: >>> >>> Decibel! wrote: >>>> >>>> ISTM it'd be useful to have an array_length function (since I just wrote >>>> one for work ;), so here's a patch. Note that I don't have the docs >>>> toolchain setup, so I wasn't able to test the doc patches. >>> >>> There is a tiny problem with this implementation: It returns null for an >>> empty array, not zero. This is because array_lower and/or array_upper >>> return null for an empty array, which makes sense for those cases. We >>> could >>> fix this by putting a coalesce around the expression, but since the array >>> functions return null for all kinds of error cases, this might mask other >>> problems. Or we move to a C implementation. >>> >> >> we should to write function isempty(anyarray), that returns true when >> param is empty. > > Well, isn't isempty() just a special case of array_length()? One or the > other needs to be implemented, so we might as well go for the general case, > IMO. >
sure, but I believe so 90% of using array_length will be test of emty array. Pavel -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
