REMOVE element from LINKSET with subquery doesn't work

[freeart]

OrientDB Version: 3.1.0 from develop branch

Java Version: docker openjdk:8-jdk-alpine

OS: docker openjdk:8-jdk-alpine

Steps to reproduce

CREATE CLASS Test;
CREATE CLASS TestMap;
CREATE PROPERTY Test.mymap LINKSET TestMap;

INSERT INTO TestMap (name) VALUES ('test');
INSERT INTO TestMap (name) VALUES ('test2');

//works
INSERT INTO Test SET mymap = (SELECT FROM TestMap WHERE name = 'test')
select mymap:{name} from Test // [{"name": "test"}]

//works
UPDATE Test set mymap = (SELECT FROM TestMap WHERE name = 'test2') || mymap
select mymap:{name} from Test // [{"name": "test"},{"name": "test2"}]

//doesn't work
UPDATE Test remove mymap = (SELECT @rid FROM TestMap WHERE name = 'test2')
select mymap:{name} from Test // [{"name": "test"},{"name": "test2"}]

//doesn't work
UPDATE Test remove mymap = (SELECT FROM TestMap WHERE name = 'test2')
select mymap:{name} from Test // [{"name": "test"},{"name": "test2"}]

//works by rid only
UPDATE Test remove mymap = #xx:x
select mymap:{name} from Test // [{"name": "test"}]

[luigidellaquila]

Hi @freeart

I just pushed a fix, now the following works fine:

UPDATE Test remove mymap = (SELECT FROM TestMap WHERE name = 'test2')

Thanks

Luigi