我想在Scala中使用窗口函数。
我有一个CSV文件,如下所示:
id;date;value1
1;63111600000;100
1;63111700000;200
1;63154800000;300
当我尝试在此数据框上应用窗口函数时, 有时它会起作用,有时会失败:
val df = loadCSVFile()
val tw = Window.orderBy(date).partitionBy(id).rangeBetween(-5356800000,0)
df.withColumn(value1___min_2_month, min(df.col("value1")).over(tw))
+---+-----------+--------------------+
| id| date|value1___min_2_month|
+---+-----------+--------------------+
| 1|63111600000| 100|
| 1|63111700000| 100|
| 1|63154800000| 100|
+---+-----------+--------------------+
所以它有效!但是当我尝试使用更大的数字(包含前一个例子的行)时,我得到以下结果
val tw =
Window.orderBy(date).partitionBy(id).rangeBetween(-8035200000,0) \n
df.withColumn(value1___min_3_month, min(df.col("value1")).over(tw))
+---+-----------+--------------------+
| id| date|value1___min_3_month|
+---+-----------+--------------------+
| 1|63111600000| null|
| 1|63111700000| null|
| 1|63154800000| null|
+---+-----------+--------------------+
答案 0 :(得分:2)
使用L
:
scala> -10000000000
<console>:1: error: integer number too large
-10000000000
^
scala> -10000000000L
res0: Long = -10000000000