hectar-glitches opened a new pull request, #1022:
URL: https://github.com/apache/iceberg-go/pull/1022

   ## Summary
   
   This PR gates validator registration on a new `needsValidation() bool` 
method on the `producerImpl` interface:
   
   - `fastAppendFiles` returns `false`: appends are commutative and need no 
conflict checks
   - `mergeAppendFiles` inherits `false` via embedding
   - `overwriteFiles` returns `true`: real conflict validation required
   - `snapshotProducer.commit()` skips registration when `needsValidation()` is 
false
   
   The no-op `validate()` methods are kept as belt-and-suspenders.
   
   Behavior is locked with two unit tests asserting that fast-append and 
merge-append commits leave `txn.validators` empty.
   
   Parent: #830


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