NULL and 0 comparison in Map datatype

[alsugiliazova]

Using 24.1 clickhouse version:

CREATE TABLE table_map (a Map(UInt8, Nullable(UInt8))) ENGINE=Memory;

INSERT INTO table_map VALUES ({0:0}), ({0:NULL});

select max(a) from table_map;

select max(a) from values ('a Nullable(UInt8)', (0), (NULL));

Output:

{0:NULL}
0

select min(a) from values ('a Nullable(UInt8)', (0), (NULL));
select min(a) from table_map;

Output:

{0:0}
0

Why in Map NULL > 0?

[Algunenano]

It's a bug. I didn't know nan_direction_hint also affected the order of NULLs