static Integer metadataVersion(String tableName) {
        synchronized (METADATA) {
            return VERSIONS.get(tableName);
        }
    }
Copy from iceberg-flink:iceberg-flink-1.15:1.1.x
inlong-sort/sort-flink/sort-flink-v1.13/sort-connectors/iceberg/src/test/java/org/apache/inlong/sort/iceberg/sink/util/TestTables.java