The ST_LinearUnHash method generates a representative geometry for a linear hash string generated by ST_LinearHash(). The
server maps geometries to a linear order for spatial indexes, and the ST_LinearHash method gives a binary string that defines
this linear ordering. The ST_LinearUnHash method reverses this operation to give a geometry that represents a particular hash
string. The hash operation is lossy in the sense that multiple distinct geometries may hash to the same binary string. The
ST_LinearUnHash method returns a geometry that covers any geometry that maps to the given linear hash.
The graphical plan for a query that uses a spatial index shows the linear hash values used to probe the spatial index. The
ST_LinearUnHash method can be used to generate a geometry that represents these hashes.