如何获取半小时之前每行的计数,该计数在某列中为1? [英] How to get the count for each row before half hour period having the value of 1 in a column?
问题描述
我的数据框如下:
id time type day
___ _____ _____ ____
1 2016-10-12 01:45:01 1 3
1 2016-10-12 01:48:01 0 3
1 2016-10-12 01:50:01 1 3
1 2016-10-12 01:52:01 1 3
2 2016-10-12 01:53:01 1 3
2 2016-10-12 02:10:01 1 3
3 2016-10-12 01:45:01 1 3
3 2016-10-12 01:48:01 1 3
从这个数据框中,我想计算出每行半小时之前该ID中类型1的出现。
例如,如果我们采用第一行
From this data frame I want to calculate to the occurences of type 1 in that id before half hour for each row. For example if we take the first row
1 2016-10-12 01:45:01 1 3
从这里我要计算 2016-10-12类型1出现的次数01:45:01
到 2016-10-12 01:15:01
,该ID最终为0,因为它是第一条记录。
From this I want to count the type 1 occurences from 2016-10-12 01:45:01
to 2016-10-12 01:15:01
in that id which is eventually 0 since it is the first record.
id time type day count_of_type1
___ _____ _____ ____ ______________
1 2016-10-12 01:45:01 1 3 0
如果我们取第三行
1 2016-10-12 01:50:01 1 3
由此我想计算从 2016-10-12 01:50:01
到 2016-10的类型1出现次数-12 01:20:01
,其ID最终为2。
From this I want to count the type 1 occurences from 2016-10-12 01:50:01
to 2016-10-12 01:20:01
in that id which is eventually 2.
id time type day count_of_type1
___ _____ _____ ____ ______________
1 2016-10-12 01:50:01 1 3 2
我阅读了以下数据框,并且也知道如何进行计数,但是我不确定的部分是如何分别为每一行添加该列:
I read the data frame as below and also know how to take count but the part i am not sure is how to append the column for each rows individually:
val df = sqlContext.read.format("com.databricks.spark.csv").option("header", "true").load("hdfs:///user/rkr/datafile.csv")
我们将不胜感激。
推荐答案
您可以使用自联接获取具有基于时间戳的条件的行。
You can use self-join to obtain rows with timestamp-based condition.
val ds = Seq(( 1, "2016-10-12 01:45:01", 1, 3),
( 1, "2016-10-12 01:48:01", 0, 3),
( 1, "2016-10-12 01:50:01", 1, 3),
( 1, "2016-10-12 01:52:01", 1, 3),
( 2, "2016-10-12 01:53:01", 1, 3),
( 2, "2016-10-12 02:10:01", 1, 3),
( 3, "2016-10-12 01:45:01", 1, 3),
( 3, "2016-10-12 01:45:01", 1, 3)).
toDF("id", "time", "type", "day")
.withColumn("timestamp", unix_timestamp($"time", "yyyy-MM-dd HH:mm:ss"))
val happenBeforeHalfHour = ds.as("left").join(ds.as("right"), $"left.id" === $"right.id" && $"right.type" === 1 &&
$"left.timestamp" > $"right.timestamp" && $"left.timestamp" - $"right.timestamp" <= 1800)
.select($"left.id", $"left.time", $"left.type", $"left.day",$"left.timestamp")
happenBeforeHalfHour.groupBy("id", "time", "type", "day", "timestamp").count.show(false)
+---+-------------------+----+---+----------+-----+
|id |time |type|day|timestamp |count|
+---+-------------------+----+---+----------+-----+
|1 |2016-10-12 01:48:01|0 |3 |1476211681|1 |
|2 |2016-10-12 02:10:01|1 |3 |1476213001|1 |
|1 |2016-10-12 01:52:01|1 |3 |1476211921|2 |
|1 |2016-10-12 01:50:01|1 |3 |1476211801|1 |
+---+-------------------+----+---+----------+-----+
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