clintropolis opened a new pull request, #19535:
URL: https://github.com/apache/druid/pull/19535

   ### Description
   changes:
   * adds `acquirePartialSegment` / `acquireCachedPartialSegment` to 
`SegmentCacheManager` and `SegmentManager` to allow callers to opt-in to async 
partial segments; MSQ `RegularLoadableSegment` uses the new partial path
   * `PartialSegmentMetadataCacheEntry`, `PartialSegmentBundleCacheEntry` are 
now wired into `SegmentLocalCacheManager`, along with added 
`PartialBundleAcquirer` helper to pass things like download thread pool and the 
ability to acquire reference holds on cache entrie
   * adds `PartialQueryableIndexSegment`, `PartialQueryableIndexCursorFactory`, 
`V10TimeBoundaryInspector` for references acquired from the now wired up 
metadata cache entry, implementing the async cursor holder contract
   * moved `DirectoryBackedRangeReader` out of tests to use as the 
implementation for `LocalLoadSpec` range reader.
   * add `FilteredCursorFactory`/`RestrictedCursorFactory` async cursor 
implementations
   * adds config `druid.segmentCache.virtualStoragePartialDownloadsEnabled to 
enable feature, on iff druid.segmentCache.virtualStorage is on
   


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