hiSandog commented on issue #18808:
URL: https://github.com/apache/pinot/issues/18808#issuecomment-4805880053

   Column deletion probably needs an explicit tombstone/deprecation phase 
rather than jumping from present to absent. One possible contract is: mark the 
column as deleted in schema metadata, reject new ingestion for it, keep query 
behavior deterministic for old segments, and only physically remove it after 
segment rewrite/retention has cleared old data. That would avoid `force=true` 
being the only escape hatch while still making the operator choose when query 
references should fail.
   


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