private boolean isIncrementalPhase(RowData rowData) {
        return rowData.getBoolean(incrementalFieldIndex);
    }
check if the data is incremental phase
by checking the incremental field
inlong-sort/sort-flink/sort-flink-v1.13/sort-connectors/iceberg/src/main/java/org/apache/inlong/sort/iceberg/sink/multiple/IcebergSingleStreamWriter.java