MySQL 8.4 Release Notes
A Polygon is a planar
Surface representing a multisided geometry.
It is defined by a single exterior boundary and zero or more
interior boundaries, where each interior boundary defines a
hole in the Polygon.
Polygon
Examples
On a region map,
Polygonobjects could represent forests, districts, and so on.
Polygon
Assertions
The boundary of a
Polygonconsists of a set ofLinearRingobjects (that is,LineStringobjects that are both simple and closed) that make up its exterior and interior boundaries.A
Polygonhas no rings that cross. The rings in the boundary of aPolygonmay intersect at aPoint, but only as a tangent.A
Polygonhas no lines, spikes, or punctures.A
Polygonhas an interior that is a connected point set.A
Polygonmay have holes. The exterior of aPolygonwith holes is not connected. Each hole defines a connected component of the exterior.
The preceding assertions make a Polygon a
simple geometry.