public V get(String columnFamilyName, K key) {
        Preconditions.checkArgument(!closed);
        try {
            byte[] val = getRocksDB().get(managedHandlesMap.get(columnFamilyName), serializeKey(key));
            return val == null ? null : deserializeValue(val);
        } catch (RocksDBException | IOException e) {
            throw new RuntimeException(e);
        }
    }
Retrieve a value for a given key in a column family.

@param columnFamilyName Column Family Name
@param key Key to be retrieved
inlong-sort/sort-flink/sort-flink-v1.13/sort-connectors/iceberg/src/main/java/org/apache/inlong/sort/iceberg/sink/collections/RocksDBDAO.java