aokolnychyi commented on issue #1597:
URL: https://github.com/apache/iceberg/issues/1597#issuecomment-707497461
I'd make both `older_than` and `retain_last` optional and require at least
one to be present. If only `retain_last` is present, I'd default `timestamp` to
the current timestamp.
The following would keep only 100 last snapshots, for example.
```
CALL catalog.schema.expire_snapshots(
namespace => 'namespace_name',
table => 'table_name',
retain_last => 100
)
```
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