clintropolis opened a new pull request, #17662:
URL: https://github.com/apache/druid/pull/17662

   ### Description
   Fixes issue noticed in 
https://github.com/apache/druid/pull/16577#issuecomment-2611993686.
   
   The problem is that the search query was using 
`ColumnCapabilities.hasBitmapIndexes()` to check if it could use the indexes 
strategy, which used to be ok when there were only indexes on string columns 
and so every column with that set would also have a 
`DictionaryEncodedStringValueIndex`, but is no longer the case.
   
   To fix, the search query now explicitly checks for columns having a 
`DictionaryEncodedStringValueIndex` available since that is what the 'use 
indexes' strategy requires.
   
   The added test fails without the code changes in this PR.
   
   <hr>
   
   This PR has:
   
   - [x] been self-reviewed.
   - [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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