BTW, having both key_is_null and key_is_not_null output args to convey a single bit of info is a bit lame. I'm removing it. We could do the same with a single boolean, since the return value already indicates it's a matching IS [NOT] NULL clause; we only need to indicate whether the NOT is present.
-- Álvaro Herrera https://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
