spark hive-udfargumenttypeexception with window函数?

c90pui9n  于 2021-06-28  发布在  Hive
关注(0)|答案(1)|浏览(490)

我有以下资料:

+------------+----------------------+-------------------+                                 
|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|                                 
+------------+----------------------+-------------------+

我正在尝试以如下方式运行窗口函数:

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();

我想要得到的是每个用户的最后两个条目(最后一个是最新日期,但因为它是按降序排列的,所以是前两行):

+------------+----------------------+-------------------+                                 
|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?
[旧]-最初,我有一个错误,现在解决了:

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,这将返回一个错误 Exception in thread "main" org.apache.hadoop.hive.ql.exec.UDFArgumentTypeException: One or more arguments are expected. 对于上面标有注解的行。我错过了什么?这个错误是什么意思?谢谢您!

q3qa4bjr

q3qa4bjr1#

rank window函数需要具有 orderBy ,例如:

WindowSpec window = Window.partitionBy(df.col("id")).orderBy(df.col("payment"));

如果没有命令,它是毫无意义的,因此是错误的。

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