json_query - redundant result

[Pavel Stehule]

Hi

I am learning new JSON API, and I am not sure, how the result of JSON_QUERY
in one case is correct. So I am asking here

(2022-04-28 10:13:26) postgres=# SELECT JSON_QUERY(jsonb '[{"a":10, "b":
20}, {"a": 30, "b":100}]', '$.**.a' with wrapper);
┌──────────────────┐
│    json_query    │
╞══════════════════╡
│ [10, 30, 10, 30] │
└──────────────────┘
(1 row)

Is this result correct? I am expecting just [10, 30]

Regards

Pavel