@Override
  public boolean equals(Object o) {
    if (this == o) {
      return true;
    }
    if (o == null || getClass() != o.getClass()) {
      return false;
    }
    MixedFormatEnumeratorOffset other = (MixedFormatEnumeratorOffset) o;
    return Objects.equal(changeSnapshotId, other.changeSnapshotId())
        && Objects.equal(snapshotTimestampMs, other.snapshotTimestampMs());
  }
use Long.MIN_VALUE to indicate the earliest offset
amoro-format-mixed/amoro-mixed-flink/amoro-mixed-flink-common/src/main/java/org/apache/amoro/flink/read/hybrid/enumerator/MixedFormatEnumeratorOffset.java