postgresql - 如何检查两个多边形是否在 Postgres 中相交？

Question

如何在 PG 8.3 中检查两个多边形是否相交？

# 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

&& 给出了错误的答案:

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

Answer 1

这是 pre-9 Postgres 的一个已知问题:http://archives.postgresql.org/pgsql-bugs/2011-02/msg00139.php