aokolnychyi commented on pull request #1819:
URL: https://github.com/apache/iceberg/pull/1819#issuecomment-733155551


   Also, per design doc, `older_than` is optional and should be defaulted to 
`System.currentTimeMillis()` if not set.
   
   Then we can keep only a given number of snapshots:
   ```
   CALL catalog.schema.expire_snapshots(
     namespace => 'namespace_name',
     table => 'table_name',
     retain_last => 100
   )
   ```


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