public static List<String> getPkNames(@Nullable TableChanges.TableChange tableSchema) {
        if (tableSchema == null) {
            return null;
        }
        return tableSchema.getTable().primaryKeyColumnNames();
    }
get sql type from table schema, represents the jdbc data type

@param tableSchema table schema
inlong-sort/sort-flink/sort-flink-v1.13/sort-connectors/mysql-cdc/src/main/java/org/apache/inlong/sort/cdc/mysql/utils/MetaDataUtils.java