@Override
        public String toString() {
            return String.format("UPDATE COLUMNS `%s` %s %s %s ",
                    fieldNames[fieldNames.length - 1],
                    dataType,
                    isNullable ? "" : "NOT NULL",
                    comment);
        }
TableChange represent requested changes to a table.
inlong-sort/sort-common/src/main/java/org/apache/inlong/sort/schema/TableChange.java