jackylee-ch commented on PR #979:
URL: https://github.com/apache/paimon-rust/pull/979#issuecomment-5944682954

   Addressed.
   
   `ensure_no_time_travel_for_write` now includes `SCAN_WATERMARK_OPTION` in 
its guarded set, alongside the five existing `scan.*` selectors. Since DROP 
PARTITION calls that guard (as do MERGE/UPDATE/DELETE/INSERT 
OVERWRITE/TRUNCATE), a write is now rejected while `scan.watermark` is set, so 
the session can no longer mutate the latest table while its reads resolve a 
historical snapshot.
   
   Regression 
`test_write_guard_rejects_watermark_selector_including_drop_partition`: on a 
partitioned table with `SET 'paimon.scan.watermark' = '100'`, both `ALTER TABLE 
... DROP PARTITION` and `DELETE` fail with the time-travel error. I verified 
non-vacuity: removing `scan.watermark` from the guarded set lets both commit 
and the test fails; with it listed they are rejected.
   
   Rebased onto current main. The write-guard tests pass; `clippy -p 
paimon-datafusion --all-targets --features fulltext,vortex -D warnings` is 
clean.
   


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