jpountz opened a new pull request, #13812:
URL: https://github.com/apache/lucene/pull/13812

   This improves testing of mismatched field numbers by
    - improving `AssertingDocValuesProducer` to detect mismatched field numbers,
    - introducing a `MismatchedCodecReader` to actually test mismatched field 
numbers on `DocValuesProducer` (a `MismatchedLeafReader` wrapping a 
`SlowCodecReaderWrapper` doesn't work since `SlowCodecReaderWrapper` implicitly 
resolves the correct `FieldInfo` object),
    - introducing an explicit test for mismatched field numbers in 
`BaseDocValuesFormatTestCase`.
   
   These new tests uncovered a bug when merging sorted doc values, which would 
call the underlying doc values producer with the merged field info.
   
   Closes #13805


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