rdblue opened a new pull request #802: Update RemoveSnapshots to protect 
cherry-picked data files
URL: https://github.com/apache/incubator-iceberg/pull/802
 
 
   This updates `RemoveSnapshots` to detect cherry-picked commits and skip 
cleanup.
   
   This doesn't handle complex cases where snapshots are explicitly expired 
using `ExpireSnapshots.expireSnapshotId`, or where the current snapshot is 
directly modified. We will want a more thorough follow-up for those cases, 
tracked by #744.
   
   This does handle cases where a change is picked into the current table state 
and the original commit expires. Cleanup for picked changes is done when the 
commit in the current snapshot's ancestors expires.

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