case expression bug

[czpmango]

nebula test:

(czp@nebula) [nba]> RETURN case when null then true else false end
+-----------------------------------------+
| CASE WHEN NULL THEN true ELSE false END |
+-----------------------------------------+
| BAD_TYPE                                |
+-----------------------------------------+

neo4j test:

neo4j@neo4j> RETURN case when null then true else false end;
+-----------------------------------------+
| case when null then true else false end |
+-----------------------------------------+
| FALSE                                   |
+-----------------------------------------+

The result of yield count(BAD_TYPE) is BAD_DATA in version v2.0.1 but 0 in version v2.5.0.
IMO, aggregate function behavior in version v2.0.1 is correct, bcz you can't just treat BadNull as Null.

Related questions in the Forum: https://discuss.nebula-graph.com.cn/t/topic/5658/31