private String doAddColumn(List<AlterColumn> alterColumns) {
        return operationHelper.buildAddColumnStatement(alterColumns);
    }
Process schema change for Doris

@param data The origin data
inlong-sort/sort-flink/sort-flink-v1.13/sort-connectors/doris/src/main/java/org/apache/inlong/sort/doris/schema/SchemaChangeHelper.java