Wrong output with JSON function

[cdevacc1]

SELECT JSON_KEYS(JSON '{"a": {"b":1}}', 1) AS json_keys

The query above return Null. It should return 'a'

[archiewood]

The problem here appears to be that ARRAY result types are not handled correctly: JSON_KEYS has a return type of ARRAY<string>

This can be reproduced by:

SELECT GENERATE_ARRAY(1, 5) AS example_array