def deduplicate(self, df: DataFrame) -> DataFrame: key_columns = [F.col(column_name) for column_name in self.config.deduplication_key_columns] order_by_columns = [F.col(column_name).desc() for column_name in self.config.deduplication_order_columns] if self.config.deduplicate_order_by_type == "asc": order_by_columns = [F.col(column_name) for column_name in self.config.deduplication_order_columns] ranking_column = "duplicates_rank" is_deleted_column = "IsDeleted" if (self.config.filter_deleted_flag) & ( is_deleted_column in df.columns): # if True removes records that marked deleted filter = (F.col(ranking_column) == 1) & (F.col(is_deleted_column) == "False") else: self.logger.warning(f"Records marked as deleted will be loaded to {self.config.table_full_name} table!") filter = F.col(ranking_column) == 1 return df.withColumn(ranking_column, F.row_number().over(Window.partitionBy(key_columns).orderBy(order_by_columns))).filter( filter).drop(ranking_column)

这段代码是用来去重的，输入是一个DataFrame，输出也是一个DataFrame。该函数首先根据配置文件中的列名获取需要去重的列和排序列，然后按照排序列进行降序或升序排列。接着，该函数给每个分组内的记录打上重复排名，最后根据重复排名过滤出排名为1的记录并删除重复排名列。如果配置文件中开启了筛选标记为删除的记录的功能，并且DataFrame中有IsDeleted列，则会将标记为删除的记录过滤掉。如果没有开启该功能，则会将标记为删除的记录加载到目标表中。

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if (self.config.filter_deleted_flag) & ( is_deleted_column in df.columns): # if True removes records that marked deleted filter = (F.col(ranking_column) == 1) & (F.col(is_deleted_column) == "False") else: self.logger.warning(f"Records marked as deleted will be loaded to {self.config.table_full_name} table!") filter = F.col(ranking_column) == 1 return df.withColumn(ranking_column, F.row_number().over(Window.partitionBy(key_columns).orderBy(order_by_columns))).filter( filter).drop(ranking_column)

这段代码是一个Python函数，主要功能是对DataFrame进行过滤、排序、计算排名，并返回结果。具体来说，函数根据一些参数（如是否过滤已删除的记录、排序方式等）对DataFrame进行过滤和排序，然后计算每个分组中每行的排名，最后返回过滤后的结果。具体注释如下：

def filter_sort_rank(df, key_columns, order_by_columns, ranking_column, is_deleted_column='is_deleted'):
    # 如果需要过滤已删除的记录，则将is_deleted_column列为"False"的记录过滤掉
    if (self.config.filter_deleted_flag) & (is_deleted_column in df.columns):
        filter = (F.col(ranking_column) == 1) & (F.col(is_deleted_column) == "False")
    else:
        # 如果不需要过滤已删除的记录，则保留所有记录，并发出警告
        self.logger.warning(f"Records marked as deleted will be loaded to {self.config.table_full_name} table!")
        filter = F.col(ranking_column) == 1
    # 对DataFrame进行排序、计算排名，并过滤掉不符合条件的记录
    return df.withColumn(ranking_column, F.row_number().over(Window.partitionBy(key_columns).orderBy(order_by_columns))).filter(filter).drop(ranking_column)

其中，`df`是输入的DataFrame，`key_columns`指定了分组的列，`order_by_columns`指定了排序的列，`ranking_column`指定了计算排名时添加的新列名，`is_deleted_column`指定了标记是否删除的列名。