[CYPHER] Label expression predicate with null node returns false instead of null

[ExtReMLapin]

Test: labelExpressionPredicateWithNullNode (line 1062)

Setup (create test data):

CREATE (n1:IsLabeledTest {name: 'test1'}),
       (n2:IsLabeledTest {name: 'test2'}),
       (n3:IsLabeledTest {name: 'test3'}),
       (n4:IsLabeledTest {name: 'test4'})

Cypher query to execute:

MATCH (n:IsLabeledTest) OPTIONAL MATCH (m:IsLabeledTest) WHERE m IS NULL RETURN n.name AS name, m:IsLabeledTest AS isLabeled

Expected behavior:

When m is null, m:LabelName should return null

ArcadeDB result:

Returns false (test expects true that result is null)

Neo4j result:

Returns null

When applying a label expression predicate to a null node, it should return null, not false.

[lvca]

Is this already fixed on main?

[ExtReMLapin]

Qwen was wrong