On 18th of December, Teodor Sigaev committed patch: Introduce distance operators over cubes: < #> taxicab distance < -> euclidean distance < => chebyshev distance Also add kNN support of those distances in GiST opclass. Author: Stas Kelvich

On 4th of December, Tom Lane committed really cool patch: KNNGIST, otherwise known as order-by-operator support for GIST. This commit represents a rather heavily editorialized version of Teodor's builtin_knngist_itself-0.8.2 and builtin_knngist_proc-0.8.1 patches. I redid the opclass API to add a separate Distance method instead ...