@Override
    public String toString() {
        return "HybridPendingSplitsState{"
                + "snapshotPendingSplits="
                + snapshotPendingSplits
                + ", isStreamSplitAssigned="
                + isStreamSplitAssigned
                + '}';
    }
A {@link PendingSplitsState} for pending hybrid (snapshot & stream) splits.
Copy from com.ververica:flink-cdc-base:2.3.0.
inlong-sort/sort-flink/cdc-base/src/main/java/org/apache/inlong/sort/cdc/base/source/assigner/state/HybridPendingSplitsState.java