Syntax
------ 
ST_IsEmpty(g)
IsEmpty(g)
 
Description
----------- 
IsEmpty is a function defined by the OpenGIS specification,
but is not fully implemented by MariaDB or MySQL. 
 
Since MariaDB and MySQL do not support GIS EMPTY values such
as POINT EMPTY, as implemented it simply returns 1 if the
geometry value g is invalid, 0 if it is valid, and NULL if
the argument is NULL.
 
ST_IsEmpty() and IsEmpty() are synonyms.
 

 
 
 
 
 
 
 

URL: https://mariadb.com/kb/en/st_isempty/