我有以下df:
+------------+----------------------+-------------------+
|increment_id|base_subtotal_incl_tax| eventdate|
+------------+----------------------+-------------------+
| 1086| 14470.0000|2016-06-14 09:54:12|
| 1086| 14470.0000|2016-06-14 09:54:12|
| 1086| 14470.0000|2015-07-14 09:54:12|
| 1086| 14470.0000|2015-07-14 09:54:12|
| 1086| 14470.0000|2015-07-14 09:54:12|
| 1086| 14470.0000|2015-07-14 09:54:12|
| 1086| 1570.0000|2015-07-14 09:54:12|
| 5555| 14470.0000|2014-07-14 09:54:12|
| 5555| 14470.0000|2014-07-14 09:54:12|
| 5555| 14470.0000|2014-07-14 09:54:12|
| 5555| 14470.0000|2014-07-14 09:54:12|
+------------+----------------------+-------------------+
我正在尝试运行窗口函数:
WindowSpec window = Window.partitionBy(df.col("id")).orderBy(df.col("eventdate").desc());
df.select(df.col("*"),rank().over(window).alias("rank")) //error for this line
.filter("rank <= 2")
.show();
我想得到的是最后两个条目(最后一个日期,但因为它按降序排序,前两行)为每个用户:
+------------+----------------------+-------------------+
|increment_id|base_subtotal_incl_tax| eventdate|
+------------+----------------------+-------------------+
| 1086| 14470.0000|2016-06-14 09:54:12|
| 1086| 14470.0000|2016-06-14 09:54:12|
| 5555| 14470.0000|2014-07-14 09:54:12|
| 5555| 14470.0000|2014-07-14 09:54:12|
+------------+----------------------+-------------------+
但我明白了:
+------------+----------------------+-------------------+----+
|increment_id|base_subtotal_incl_tax| eventdate|rank|
+------------+----------------------+-------------------+----+
| 5555| 14470.0000|2014-07-14 09:54:12| 1|
| 5555| 14470.0000|2014-07-14 09:54:12| 1|
| 5555| 14470.0000|2014-07-14 09:54:12| 1|
| 5555| 14470.0000|2014-07-14 09:54:12| 1|
| 1086| 14470.0000|2016-06-14 09:54:12| 1|
| 1086| 14470.0000|2016-06-14 09:54:12| 1|
+------------+----------------------+-------------------+----+
我错过了什么?
[OLD] - 最初,我有一个错误,现在已经解决了:
WindowSpec window = Window.partitionBy(df.col("id"));
df.select(df.col("*"),rank().over(window).alias("rank")) //error for this line
.filter("rank <= 2")
.show();
但是,对于上面标有注释的行,这会返回错误Exception in thread "main" org.apache.hadoop.hive.ql.exec.UDFArgumentTypeException: One or
more arguments are expected.
。我错过了什么?这个错误是什么意思?谢谢!
答案 0 :(得分:0)
rank
窗口函数需要一个带orderBy
的窗口,例如:
WindowSpec window = Window.partitionBy(df.col("id")).orderBy(df.col("payment"));
没有订单就没有意义,因此错误。