id,summary,reporter,owner,description,type,status,priority,milestone,component,version,severity,resolution,keywords,cc,focuses 18158,Meta Query for posts with a meta key not set (IS NULL).,johnnyb,georgestephanis,"In the meta_query, we should be able to query for posts that don't have a certain meta key at all. I suggest a syntax something like this: {{{ ... meta_query => array( array( 'key' => '_my_special_meta', 'compare' => 'NOT EXISTS' ) ) ... }}} Alternately this could be handled invisibly along the lines of: {{{ ... meta_query => array( array( 'key' => '_my_special_meta', 'value' => 'a_value_this_might_have', 'compare' => '!=' ) ) ... }}} This could be done using a left join, and not some sort of special case like above. Since it's a left join we may have to be careful that we don't end up with a bunch of junk rows in the query, however.",enhancement,closed,normal,3.5,Query,3.2.1,normal,fixed,has-patch needs-unit-tests commit,,