MBRWithin(g1, g2)

Returns 1 or 0 to indicate whether the minimum bounding rectangle of g1
is within the minimum bounding rectangle of g2. This tests the opposite
relationship as MBRContains().

MBRWithin() handles its arguments as described in the introduction to
this section.

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

