如何检查Postgres中两个多边形是否相交？

Question

如何检查两个多边形是否在PG 8.3中相交？

#和#?不适用于多边形：

select polygon'((0,0), (1,2), (0,2))' # polygon'((0.5, 0), (1,0), (1,1))';
ERROR:  operator does not exist: polygon # polygon

select polygon'((0,0), (1,2), (0,2))' #? polygon'((0.5, 0), (1,0), (1,1))';
ERROR:  operator does not exist: polygon #? polygon

并且&&错误地说明了：

select polygon'((0,0), (1,2), (0,2))' && polygon'((0.5, 0), (1,0), (1,1))';
 ?column? 
----------
 t
(1 row)

Answer 1

这是Post-9之前的已知问题：http://archives.postgresql.org/pgsql-bugs/2011-02/msg00139.php