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/