private List<BigInteger> getCurrentRedoLogSequences() throws SQLException {
        return jdbcConnection.queryAndMap(
                SqlUtils.currentRedoLogSequenceQuery(),
                rs -> {
                    List<BigInteger> sequences = new ArrayList<>();
                    while (rs.next()) {
                        sequences.add(new BigInteger(rs.getString(1)));
                    }
                    return sequences;
                });
    }
Get the current redo log sequence(s).

<p>In an Oracle RAC environment, there are multiple current redo logs and therefore this
method returns multiple values, each relating to a single RAC node in the Oracle cluster.

@return list of sequence numbers
@throws SQLException if a database exception occurred
inlong-sort/sort-flink/sort-flink-v1.13/sort-connectors/oracle-cdc/src/main/java/io/debezium/connector/oracle/logminer/LogMinerStreamingChangeEventSource.java