[PR] fix: correct JSON serialization of CloneQueryMode (druid)

["FrankChen021 (via GitHub)" <gi...@apache.org>]

FrankChen021 opened a new pull request, #20557:
URL: https://github.com/apache/druid/pull/20557

   ### Description
   
   `CloneQueryMode` serializes as its constant name (`PREFERCLONES`), but its `@JsonCreator` only accepts `preferClones`, so a serialized value can't be read back. This annotates `toString()` with `@JsonValue` so both directions use `preferClones`.
   
   Query context reads are unaffected, since they parse the string case-insensitively.
   
   <hr>
   
   This PR has:
   
   - [x] been self-reviewed.
   - [x] added unit tests or modified existing tests to cover new code paths.
   


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Re: [PR] fix: correct JSON serialization of CloneQueryMode (druid)

["FrankChen021 (via GitHub)" <gi...@apache.org>]

FrankChen021 merged PR #20557:
URL: https://github.com/apache/druid/pull/20557


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