<div>Helllo.</div><div> </div><div>I want to implement knn for spgist. I dont have question with knn, but have questions with implementation of interface.</div><div> </div><div>i modify pg_am.h (set amcanorderbyop to true in spgist index).Also i modify pg_amop.h(add </div><div> </div><div>DATA(insert ( 4015 600 600 15 o 517 4000 1970 ));</div><div> </div><div>)</div><div> </div><div>explain SELECT * FROM quad_point_tbl ORDER BY p <-> '-2,50'</div><div> </div><div> Sort (cost=1219.31..1246.82 rows=11003 width=16)<br /> Sort Key: ((p <-> '(-2,50)'::point))<br /> -> Index Only Scan using sp_quad_ind on quad_point_tbl (cost=0.15..480.70 r<br />ows=11003 width=16)</div><div><span lang="en"><span>what</span> <span>am I doing wrong</span><span>?</span></span></div><div><span lang="en"><span>In a gist index we have :<br /></span></span></div><div> </div><div><span lang="en"><span>regression=# explain SELECT * FROM point_tbl ORDER BY f1 <-> '-3,0';<br /> QUERY PLAN <br />----------------------------------------------------------------------------<br /> Index Scan using gpointind on point_tbl (cost=0.13..8.27 rows=7 width=16)<br /> Order By: (f1 <-> '(-3,0)'::point)<br /> Planning time: 0.166 ms<br />(3 rows)<br /></span></span></div><div> </div><div><span lang="en"><span>Are there</span> <span>documents about modification access methods</span><span>?</span></span></div><div> </div><div><span lang="en"><span>Thanks.</span></span></div><div><span lang="en"><span>Constantine Kuznetsov</span></span></div>