public Builder<T> startSnapshotId(Long newStartSnapshotId) {
            if (newStartSnapshotId != null) {
                readOptions.put(
                        FlinkReadOptions.START_SNAPSHOT_ID.key(), Long.toString(newStartSnapshotId));
            }
            return this;
        }
Copy from iceberg-flink:iceberg-flink-1.15:1.3.1
inlong-sort/sort-flink/sort-flink-v1.15/sort-connectors/iceberg/src/main/java/org/apache/inlong/sort/iceberg/source/IcebergSource.java