MySQL Documentation
Found in the MySQL 5.0 Reference Manual:
- Related(g1,g2,pattern_matrix)
Returns 1 or 0 to indicate whether the spatial relationship specified by pattern_matrix exists between g1 and g2. Returns –1 if the arguments are NULL. The pattern matrix is a string. Its specification will be noted here if this function is implemented.
(emphasis mine.)
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[...] powerful, and perhaps underused spatial extensions, but the most interesting functions are still unimplemented: “Note: Currently, MySQL does not implement these [...]