Check if trajectory data is stored in OSS using ST_IsExternal - ApsaraDB RDS - Alibaba Cloud - ApsaraDB RDS

You can use this function to check whether the data of a trajectory object is stored in Object Storage Service (OSS).

Note

This function is expected to be deprecated in a later version. Use for a better experience.

Syntax

bool ST_IsExternal(trajectory traj);

Parameter	Description
traj	The trajectory object.

If the data of the specified trajectory object is stored in OSS, the function returns t. Otherwise, this function returns f.

SELECT ST_IsExternal(traj) FROM trajs;
 st_isexternal 
---------------
 t
 t
 t
 f
 t
(5 rows)