Lookup on vertex with nullable field

[anand817]

I am trying to do a lookup on vertex named test, which has a name parameter that can be null and an age parameter, which is an int
I tried both

LOOKUP ON test where test.name == NULL YIELD test getting Error: SemanticError: Column type error: name
and
LOOKUP ON test where test.name IS NULL YIELD test getting Error: SemanticError: Expression test.name IS NULL is not supported yet

I also have an index created on both name and age separately, so that I can do a lookup on them

But neither is working
Could anyone help? What should be the expected query to get all the nodes with the tag test, which have a name value set to NULL

Here's the output of DESCRIBE TAG test if needed