[PR] support non-constant expressions for path arguments for json_value and json_query (druid)

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

clintropolis opened a new pull request, #15320:
URL: https://github.com/apache/druid/pull/15320

   ### Description
   This PR adds support for using expressions to compute the json path argument for `JSON_VALUE` and `JSON_QUERY` functions. Note that when using a path expression that isn't a constant, Druid cannot take advantage of the specialized virtual column typically used, and so must fall back to a pure expression virtual column to compute the values from the 'raw' json blob, which will be much less performant than if the path is constant and known up front.
   
   <hr>
   
   This PR has:
   
   - [x] been self-reviewed.
   - [ ] added Javadocs for most classes and all non-trivial methods. Linked related entities via Javadoc links.
   - [x] added comments explaining the "why" and the intent of the code wherever would not be obvious for an unfamiliar reader.
   - [x] 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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Re: [PR] support non-constant expressions for path arguments for json_value and json_query (druid)

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

clintropolis merged PR #15320:
URL: https://github.com/apache/druid/pull/15320


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