clintropolis opened a new pull request, #12900:
URL: https://github.com/apache/druid/pull/12900
### Description
This PR switches `TO_JSON_STRING` and `PARSE_JSON` functions to use the
`@Json` annotated `ObjectMapper` to better tie into the standard JSON serde we
use for result formats, as mentioned as an alternative to solving the problem
in #12893 (we should do both).
This allows a much wider variety of complex types to be translated into
strings using `TO_JSON_STRING`, many of these likely just being turned into
base64 string values, but now they at least work instead of failing with an
error such as
```
Unable to stringify
[org.apache.druid.query.aggregation.datasketches.theta.SketchHolder@a92fef64]
to JSON
```
<hr>
This PR has:
- [x] been self-reviewed.
- [ ] added unit tests or modified existing tests to cover new code paths,
ensuring the threshold for [code
coverage](https://github.com/apache/druid/blob/master/dev/code-review/code-coverage.md)
is met.
- [x] been tested in a test Druid cluster.
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