CREATE OR REPLACE FUNCTION shortest_path(
sql text,
source_id integer,
target_id integer,
directed boolean,
has_reverse_cost boolean)
RETURNS SETOF path_result
AS '$libdir/librouting'
LANGUAGE 'C' IMMUTABLE STRICT;
当我尝试创建如上所述的函数时,我收到的错误就像语言C不存在
Postgres版本9.3 x86 PostGIS版 - postgis Bundle 2.1版(带pgrouting 2.0)