[BUGS] pgsql 8.4 not + is contained by operators return wrong result
*Description:* By pgsql 8.4 I have the following bug: If the haystack array is null (for example by empty result of array_agg) by is contained by, and you use it with negation, the the result is false instead of true. *Reproduce:* The following query returns nothing, but it should return 1. *SELECT 1 FROM NOT(ARRAY[1] @ NULL**); * *Workaround:* *SELECT 1 FROM (haystack IS NULL OR NOT(ARRAY[1] @ **haystack**)); *
Re: [BUGS] pgsql 8.4 not + is contained by operators return wrong result
=?ISO-8859-1?Q?L=E1szl=F3_Lajos_J=E1nszky?= laszlo.jans...@gmail.com writes: The following query returns nothing, but it should return 1. *SELECT 1 FROM NOT(ARRAY[1] @ NULL**); * I assume you meant SELECT 1 WHERE NOT(ARRAY[1] @ NULL) ? Because what you wrote doesn't parse. This is not a bug. ARRAY[1] @ NULL yields NULL. NOT (NULL) is still NULL. WHERE treats a NULL result as FALSE. It might help you to consider that NULL means unknown. It does not mean empty array. regards, tom lane -- Sent via pgsql-bugs mailing list (pgsql-bugs@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-bugs
