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Excerpts from this Manual

functions-for-testing-spatial-relations-between-geometric-objects

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User Comments
  Posted by Alexander Skakunov on April 25, 2014
This extension doesn't correctly calculate since it works with rectangles around the polygons, not the polygons.

If you try to write your own functions for it, they will be slow (I wrote about this in this article — http://i1t2b3.com/2014/04/17/major-problems-with-geo-in-mysql/ )

Best ways are either use a new version which uses real shapes, or switch to Postgres+PostGIS if possible.
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