MBREquals(g1, g2)

Returns 1 or 0 to indicate whether the minimum bounding rectangles of
the two geometries g1 and g2 are the same.

MBREquals() handles its arguments as described in the introduction to
this section, except that it does not return NULL for empty geometry
arguments.

URL: https://dev.mysql.com/doc/refman/8.0/en/spatial-relation-functions-mbr.html

