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Darafei Praliaskouski authored
Gets rid of calls to sqrt, getPoint2d_cp, lwgeom_is_empty, lwgeom_as_lwpoint, stringbuffer_append. KMeans on 200 000 points is now 30% faster. Closes https://github.com/postgis/postgis/pull/294 git-svn-id: http://svn.osgeo.org/postgis/trunk@16760 b70326c6-7e19-0410-871a-916f4a2858ee
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