@Override
    public List<Column> columns() {
        return columnDefs;
    }
A implementation class of {@link Table} interface, which can be used to instantiate a {@link TableImpl} object.
inlong-sort/sort-flink/sort-flink-v1.13/sort-connectors/postgres-cdc/src/main/java/org/apache/inlong/sort/cdc/postgres/debezium/internal/TableImpl.java