snuyanzin commented on PR #24156:
URL: https://github.com/apache/flink/pull/24156#issuecomment-1938687661
>Is it mainly because of the definition of JSON_QUOTE that does not require
its input to be valid JSON, and JSON_UNQOTE that require its input to be a
valid JSON.
I'm not sure that this is the only reson
there is a more simple case, for instance '"key"` is a valid JSON and
`json_quote` produces also a valid json `"\"key\""`
however the combination also seems not working
```sql
SELECT json_unquote(json_quote('"key"'));
```
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