sql - 如何修复 Postgres 9.1 中的输入超出范围错误

Question

在 Postgres 9.1 中，下面的代码会产生错误

ERROR:  input is out of range
CONTEXT:  SQL function "gc_dist1" statement 1

如何在 9.1 中修复它？

create or replace function gc_dist1(_lat1 float8, _lon1 float8, _lat2 float8, _lon2 float8) 
returns float8 as $$ 
select ACOS(SIN(radians($1))*SIN(radians($3))+COS(radians($1))*COS(radians($3))*COS(radians($4)-radians($2)))*6371; 
$$ language sql immutable;

select gc_dist1(24.6269989013672,59.3357849157094,24.6269989013672,59.3357849121094);

Answer 1

如果失败是因为acos()函数不能接受高于 1 的值。在您的示例中就是这种情况。

SELECT  (
        SIN(radians(24.6269989013672))
        * SIN(radians(24.6269989013672))
        + COS(radians(24.6269989013672))
        * COS(radians(24.6269989013672))
        * COS(radians(59.3357849121094)-radians(59.3357849157094))
    ) > 1 -- true

看来您的功能逻辑不正确。