dawidwys commented on PR #24704:
URL: https://github.com/apache/flink/pull/24704#issuecomment-2126455846
I believe this falls into `ON EMPTY` category and the default is `NULL`. If
you use `lax` strategy the checks are less strict and there is no error, but no
results. I am not an expert on the JSON expressions though.
That's why when you use:
```
SELECT JSON_QUERY('{"a":[{"c":Null},{"c":"c2"}]}', 'lax $.a[*].c' RETURNING
ARRAY<STRING> ERROR ON ERROR NULL ON EMPTY); // explicitly specified the other
parameter using the default value
```
you get `null`
if you run:
```
SELECT JSON_QUERY('{"a":[{"c":Null},{"c":"c2"}]}', 'lax $.a[*].c' RETURNING
ARRAY<STRING> ERROR ON ERROR ERROR ON EMPTY);
```
you get an error:
```
Caused by: org.apache.flink.table.api.TableRuntimeException: Empty result of
JSON_QUERY function is not allowed
```
Bear in mind that I have not changed anything in the json extraction logic.
If you think the JSON expressions don't work the way you'd like let's fire a
different ticket.
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