问题描述
我需要在main_df中创建一个二进制变量，条件是距ind_df最近的共同日期。
main=spark.createDataFrame([("J1","2016-10-01 00:42:00",100),("J1","2016-10-01 11:45:30",200),"2016-10-05 16:20:00",("J9","2016-10-06 08:35:00",300),"2016-10-07 01:20:00",200)],["id","date","value"]).show()
ind_df=spark.createDataFrame([("J1","2016-10-01 00:15:30"),"2016-10-01 11:45:40"),"2016-10-07 01:20:50")],"date"]).show()
+---+-------------------+-----+
| id| date|value|
+---+-------------------+-----+
| J1|2016-10-01 00:42:00| 100|
| J1|2016-10-01 11:45:30| 200|
| J1|2016-10-05 16:20:00| 100|
| J9|2016-10-06 08:35:00| 300|
| J9|2016-10-07 01:20:00| 200|
+---+-------------------+-----+
+---+-------------------+
| id| date|
+---+-------------------+
| J1|2016-10-01 00:15:30|
| J1|2016-10-01 11:45:40|
| J9|2016-10-07 01:20:50|
+---+-------------------+
所需的数据框：
+---+-------------------+-----+-----+
| id| date|value| ind |
+---+-------------------+-----+-----+
| J1|2016-10-01 00:42:00| 100| 1 |
| J1|2016-10-01 11:45:30| 200| 1 |
| J1|2016-10-05 16:20:00| 100| 0 |
| J9|2016-10-06 08:35:00| 300| 0 |
| J9|2016-10-07 01:20:00| 200| 1 |
+---+-------------------+-----+-----+
解决方法
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