/** Create from a different SCN with modifying a single partition sequence */
public MultiPartitionSCN(MultiPartitionSCN other, int partitionIdx, long seq) {
_seq = other.getSequences(partitionIdx < other._seq.length ? null : new long[partitionIdx + 1]);
_seq[partitionIdx] = seq;
}
/** Copy constructor */
public MultiPartitionSCN(MultiPartitionSCN other) {
_seq = other.getSequences();
}