XiaoHongbo-Hope commented on PR #8826:
URL: https://github.com/apache/paimon/pull/8826#issuecomment-5205903208

   Addressed the latest correctness review in 7cb26cd46:
   
   - Snapshot pinning now uses `copy_without_time_travel()`. Workers read the 
pinned snapshot and write with the planned current schema, so a newly added 
column can be backfilled before any new data snapshot exists.
   - `read_projection` and SQL filter fields are protected as read 
dependencies. Concurrent updates to those fields on overlapping row ranges now 
fail conflict detection.
   
   Added real-Ray regressions for the new-column case and both read/filter 
dependency conflicts. Focused tests and lint pass.


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