snuyanzin commented on code in PR #28688:
URL: https://github.com/apache/flink/pull/28688#discussion_r3546336287
##########
docs/data/sql_functions.yml:
##########
@@ -1685,6 +1685,17 @@ bitmapagg:
`bitmap BITMAP`
Returns a `BIGINT`.
+ - sql: JSON_LENGTH(json_doc[, path])
+ table: jsonLength(jsonObject[, path])
+ description: |
+ Returns the number of elements in a JSON document, or the length of the
value at the specified path if one is provided.
+ Returns NULL if the argument is NULL or the path does not locate a value.
Review Comment:
this does not look true
simple tests show different behavior
```sql
SELECT json_length('$');
SELECT json_length('{');
```
each returns `-1` and the doc says nothing about this
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