Akanksha-kedia commented on PR #18920:
URL: https://github.com/apache/pinot/pull/18920#issuecomment-5365649786

   @J-HowHuang added `BaseIndexHandlerTest` covering all the corner cases you 
asked about:
   - Null properties (in-memory segment) → returns null
   - Missing key (legacy segment) → returns null  
   - Round-trip in-memory (default config + non-default config)
   - Round-trip through disk (write → save → reload → read)
   - Special characters in serialized JSON (colons, quotes) round-trip via 
escaping
   - Corrupt/undeserializable stored value → null, no exception
   - Multiple columns under the same key don't interfere
   - `loadMetadataProperties()` returns non-null for a file-backed segment


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