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<p>全部</p>
<p>我有一个数据集,其定义如下:</p>
<pre><code>eno|date|attendance
1|01-Jan-2010|P
1|02-Jan-2010|P
1|03-Jan-2010|A
1|04-Jan-2010|P
1|05-Jan-2010|P
2|01-Jan-2010|P
2|02-Jan-2010|P
2|03-Jan-2010|P
2|04-Jan-2010|A
2|05-Jan-2010|P
</code></pre>
<p>对于每个员工,要求创建一个“间隔组”,基本上按时间顺序对出勤值进行分组。组是将相似的出勤值分组到一起,直到看到新的出勤值。因此,预期输出为:</p>
<pre><code>eno|date|attendance|attendanceGroup
1|01-Jan-2010|P|1
1|02-Jan-2010|P|1
1|03-Jan-2010|A|2
1|04-Jan-2010|P|3
1|05-Jan-2010|P|3
2|01-Jan-2010|P|1
2|02-Jan-2010|P|1
2|03-Jan-2010|P|1
2|04-Jan-2010|A|2
2|05-Jan-2010|P|3
</code></pre>
<p>到目前为止,我所能做的就是获取前一行的出勤值,但完全不知道如何从这里开始…提前多谢。。你知道吗</p>
<pre><code>from datetime import datetime, timedelta
EmployeeAttendance = Row("eno", "date", "attendance")
EmpAttRowList = [EmployeeAttendance("1", datetime.now().date() - timedelta(days=100), "Y"),
EmployeeAttendance("1", datetime.now().date() - timedelta(days=99), "Y"),
EmployeeAttendance("1", datetime.now().date() - timedelta(days=98), "N"),
EmployeeAttendance("1", datetime.now().date() - timedelta(days=97), "Y"),
EmployeeAttendance("1", datetime.now().date() - timedelta(days=96), "Y"),
EmployeeAttendance("1", datetime.now().date() - timedelta(days=95), "N"),
EmployeeAttendance("1", datetime.now().date() - timedelta(days=94), "Y"),
EmployeeAttendance("1", datetime.now().date() - timedelta(days=93), "Y"),
EmployeeAttendance("2", datetime.now().date() - timedelta(days=100), "Y"),
EmployeeAttendance("2", datetime.now().date() - timedelta(days=99), "Y"),
EmployeeAttendance("2", datetime.now().date() - timedelta(days=98), "N"),
EmployeeAttendance("2", datetime.now().date() - timedelta(days=97), "Y"),
EmployeeAttendance("2", datetime.now().date() - timedelta(days=96), "Y"),
EmployeeAttendance("2", datetime.now().date() - timedelta(days=95), "N"),
EmployeeAttendance("2", datetime.now().date() - timedelta(days=94), "N"),
EmployeeAttendance("2", datetime.now().date() - timedelta(days=93), "N"),
EmployeeAttendance("2", datetime.now().date() - timedelta(days=92), "Y"),
EmployeeAttendance("2", datetime.now().date() - timedelta(days=91), "Y"),
EmployeeAttendance("2", datetime.now().date() - timedelta(days=90), "N"),
EmployeeAttendance("3", datetime.now().date() - timedelta(days=97), "Y"),
EmployeeAttendance("3", datetime.now().date() - timedelta(days=96), "Y"),
EmployeeAttendance("3", datetime.now().date() - timedelta(days=95), "Y"),
EmployeeAttendance("3", datetime.now().date() - timedelta(days=94), "N"),
EmployeeAttendance("3", datetime.now().date() - timedelta(days=93), "N"),
EmployeeAttendance("3", datetime.now().date() - timedelta(days=92), "Y"),
EmployeeAttendance("3", datetime.now().date() - timedelta(days=91), "Y"),
EmployeeAttendance("3", datetime.now().date() - timedelta(days=90), "Y"),
EmployeeAttendance("3", datetime.now().date() - timedelta(days=89), "Y")
]
df = spark.createDataFrame(EmpAttRowList, EmployeeAttendance)
window = Window.partitionBy(df['eno']).orderBy("date")
previousrowattendance = lag(df["attendance"]).over(window)
</code></pre>