xiangfu0 opened a new pull request, #19996:
URL: https://github.com/apache/pinot/pull/19996

   Readers currently expose only materialized values. Add default 
`ColumnReader.getJsonValue(docId, jsonTransformer)` so specialized readers can 
avoid repeated materialization while ordinary readers keep the existing 
conversion behavior.
   
   Usage: `Object json = reader.getJsonValue(docId, jsonTransformer);` Pass a 
deterministic JSON converter; the default calls 
`jsonTransformer.transform(getValue(docId))`, including nulls, and propagates 
failures. Overrides may reuse immutable results.
   
   Validation: all 9 `ColumnReaderTest` cases pass; formatting, license and 
Checkstyle checks pass; `pinot-spi` still compiles to Java 11 bytecode.
   


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