当我执行下面的查询;
SELECT Assign_vertex_id('ways', 0.00001, 'the_geom', 'gid')
我收到以下错误;
NOTICE: CREATE TABLE will create implicit sequence "vertices_tmp_id_seq" for serial column "vertices_tmp.id"
CONTEXT: SQL statement "CREATE TABLE vertices_tmp (id serial)"
PL/pgSQL function "assign_vertex_id" line 15 at EXECUTE statement
ERROR: query string argument of EXECUTE is null
CONTEXT: PL/pgSQL function "assign_vertex_id" line 32 at EXECUTE statement
********** Error **********
ERROR: query string argument of EXECUTE is null
SQL state: 22004
Context: PL/pgSQL function "assign_vertex_id" line 32 at EXECUTE statement
任何想法,为什么会出现这种情况?