It is being worked on. Good summary of TODO: <a href="http:&#x2F;&#x2F;www.postgresql.org&#x2F;message-id&#x2F;CAMsr+YEfTEp35bQ5ia__nDwc2MwzYUQcuQ__vT_b=UNOHyooMA@mail.gmail.com" rel="nofollow">http:&#x2F;&#x2F;www.postgresql.org&#x2F;message-id&#x2F;CAMsr+YEfTEp35bQ5ia__nD...</a>