liukun4515 commented on issue #1597:
URL: https://github.com/apache/iceberg/issues/1597#issuecomment-707455716
@aokolnychyi
```
CALL catalog.schema.expire_snapshots(
namespace => 'namespace_name',
table => 'table_name',
retain_last => 100
)
```
In the `expire snapshot` API, if we only give the `retain last num` for a
table, the commit action is invalid.
the apply code is:
```
private TableMetadata internalApply() {
this.base = ops.refresh();
TableMetadata updateMeta = base.removeSnapshotsIf(snapshot ->
idsToRemove.contains(snapshot.snapshotId()) ||
(expireOlderThan != null && snapshot.timestampMillis() <
expireOlderThan &&
!idsToRetain.contains(snapshot.snapshotId())));
List<Snapshot> updateSnapshots = updateMeta.snapshots();
List<Snapshot> baseSnapshots = base.snapshots();
return updateSnapshots.size() != baseSnapshots.size() ? updateMeta :
base;
}
```
if the `expireOlderThan` is not set, the `retain last num` or `idsToRetain`
is invalid.
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