Hi, Thanks for your responses.
The specific use case which I am interested in is " Numeric LIKE Pattern_string ". I'm willing to attempt a patch to support the specific use case above by adding implicit casts, without modifying the entire casting rules. Is this something that is likely to be included in the code ? Thanks & Regards, Vaishnavi -----Original Message----- From: pgsql-hackers-ow...@postgresql.org [mailto:pgsql-hackers-ow...@postgresql.org] On Behalf Of Kevin Grittner Sent: Wednesday, 17 July 2013 6:23 AM To: Robert Haas; Merlin Moncure Cc: Tom Lane; Josh Berkus; pgsql-hackers@postgresql.org Subject: Re: [HACKERS] Differences in WHERE clause of SELECT Robert Haas <robertmh...@gmail.com> wrote: > We can certainly continue to play whack-a-mole and dream up a new > solution every time a really intolerable variant of this problem comes > up. But that doesn't seem good to me. It means that every case > behaves a little different from every other case, and the whole thing > is kinda arcane and hard to understand, even for hackers. If you're building up a list of things that generate errors in PostgreSQL but not other DBMS products, make sure you have this: test=# create table t(d date); CREATE TABLE test=# insert into t values (NULL); INSERT 0 1 test=# insert into t values (COALESCE(NULL, NULL)); ERROR: column "d" is of type date but expression is of type text LINE 1: insert into t values (COALESCE(NULL, NULL)); ^ HINT: You will need to rewrite or cast the expression. From a user perspective, it's hard to explain why COALESCE(NULL, NULL) fails in a location that a bare NULL works. From the perspective of those working on the code, and looking at the problem from the inside out, it seems sane; but that's the only perspective from which it does. -- Kevin Grittner EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
