@Override
  public void clear(final SegmentIdentifier segment) {
    throw new UnsupportedOperationException(
        "RocksDBColumnarKeyValueSnapshot does not support clear");
  }
Instantiates a new RocksDb columnar key value snapshot.

@param db the db
@param metrics the metrics
plugins/rocksdb/src/main/java/org/hyperledger/besu/plugin/services/storage/rocksdb/segmented/RocksDBColumnarKeyValueSnapshot.java