ST_Overlaps(g1,g2)

Returns 1 or 0 to indicate whether g1 spatially overlaps g2. The term
spatially overlaps is used if two geometries intersect and their
intersection results in a geometry of the same dimension but not equal
to either of the given geometries.

As of MySQL 5.7.5, this function returns 0 if called with an
inapplicable geometry argument type combination. For example, it
returns 0 if called with geometries of different dimensions or any
argument is a Point.

URL: http://dev.mysql.com/doc/refman/5.7/en/spatial-relation-functions-object-shapes.html

