我有一个包含卡、时间和金额的数据框,我需要在一个月的窗口内汇总卡的金额(总和和计数)。
以下是数据的外观:
+--------------------+-------------------+------------+
| card_uid| date|amount_local|
+--------------------+-------------------+------------+
|card_001H4Mw1Ha0M...|2016-05-04 17:54:30| 8.99|
|card_0026uGZQwZQd...|2016-05-06 12:16:18| 16.19|
|card_0026uGZQwZQd...|2016-07-06 12:17:57| 16.19|
|card_003STfrgB8SZ...|2016-12-04 10:05:21| 58.8|
|card_005gBxyiDc6b...|2016-09-10 18:58:25| 27.95|
|card_005gBxyiDc6b...|2016-11-12 11:18:29| 12.99|
这就是我到目前为止所做的。
+--------------------+-------------------+------------+----------------+
| card_uid| date|amount_local|duration_cum_sum|
+--------------------+-------------------+------------+----------------+
|card_001H4Mw1Ha0M...|2016-05-04 17:54:30| 8.99| 8.99|
|card_0026uGZQwZQd...|2016-05-06 12:16:18| 16.19| 16.19|
|card_0026uGZQwZQd...|2016-07-06 12:17:57| 16.19| 32.38|
|card_003STfrgB8SZ...|2016-12-04 10:05:21| 58.8| 58.8|
|card_005gBxyiDc6b...|2016-09-10 18:58:25| 27.95| 27.95|
|card_005gBxyiDc6b...|2016-11-12 11:18:29| 12.99| 40.94|
窗口功能如下:
partition = Window.partitionBy("card_uid").orderBy("date")
previousTransactionDate = data.withColumn("previous_tr_time", lag(data.date).over(partition)).select("transaction_id", "card_uid", "date", "previous_tr_time")
df_cum_sum = data.withColumn("duration_cum_sum", sum('amount_local').over(partition))
df_cum_sum.orderBy("card_uid","date").select("card_uid", "date", "amount_local", "duration_cum_sum").show()
但我只想补充两件事:
如果日期小于一个月,则以相同方式汇总
用零代替相同的累计和
所以需要的输出如下:
+--------------------+-------------------+------------+----------------+
| card_uid| date|amount_local|duration_cum_sum|
+--------------------+-------------------+------------+----------------+
|card_001H4Mw1Ha0M...|2016-05-04 17:54:30| 8.99| 0|
|card_0026uGZQwZQd...|2016-05-06 12:16:18| 16.19| 0|
|card_0026uGZQwZQd...|2016-05-12 12:17:57| 4.00| 16.19|
|card_0026uGZQwZQd...|2016-06-06 12:23:51| 16.19| 4.00| => Only 4 because de 16.19 was more than one month ago
|card_003STfrgB8SZ...|2016-12-04 10:05:21| 58.8| 0|
|card_005gBxyiDc6b...|2016-09-10 18:58:25| 27.95| 0|
|card_005gBxyiDc6b...|2016-09-12 11:18:29| 12.99| 27.95| => Previous amount
|card_005gBxyiDc6b...|2016-09-22 14:25:44| 23.99| 40.94| => 27.95 + 12.99
我无法按卡的uid分组,因为我需要与原始表相同的行数才能链接到另一个表
最佳答案
您需要一个滚动窗口的日期从过去30天到前一天不等。由于间隔函数不可用于窗口,因此可以将日期转换为长值,并使用“天数”值创建窗口范围。
from pyspark.sql.functions import *
days = lambda i: i * 86400
partition = Window.partitionBy("card_uid").orderBy(col("date").cast("timestamp").cast("long")).rangeBetween(days(-30), days(-1))
df_cum_sum = data.withColumn("duration_cum_sum",sum(col('amount_local')).over(partition))\
.fillna(0,subset=['duration_cum_sum'])
df_cum_sum.show()