计算 Hive 中除星期日外的天数

Question

我有两个时间戳作为输入。我想计算这些时间戳之间的时差（星期日除外）。

我可以使用 hive 中的 datediff 函数获取天数。

我可以使用 from_unixtime(unix_timestamp(startdate), 'EEEE').[=24 获取特定日期的日期=]

但我不知道如何关联这些功能来实现我的要求，或者有没有其他简单的方法可以实现这一点。

提前致谢。

Answer 1

您可以编写一个自定义 UDF，它将包含日期的两列作为输入并计算除星期日之外的日期之间的差异。

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.List;
import java.util.Date;
import org.apache.hadoop.hive.ql.exec.UDF;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;

public class IsoYearWeek extends UDF {

  public LongWritable evaluate(Text dateString,Text dateString1) throws ParseException { //takes the two columns as inputs
    SimpleDateFormat date = new SimpleDateFormat("dd/MM/yyyy");
/*  String date1 = "20/07/2016";
    String date2 = "28/07/2016";
*/  int count=0;

    List<Date> dates = new ArrayList<Date>();

    Date  startDate = (Date)date.parse(dateString.toString()); 
    Date  endDate = (Date)date.parse(dateString1.toString());
    long interval = 24*1000 * 60 * 60; // 1 hour in millis
    long endTime =endDate.getTime() ; // create your endtime here, possibly using Calendar or Date
    long curTime = startDate.getTime();
    while (curTime <= endTime) {
        dates.add(new Date(curTime));
        curTime += interval;
    }
    for(int i=0;i<dates.size();i++){
        Date lDate =(Date)dates.get(i);
        if(lDate.getDay()==0){
            count+=1;  //counts the number of sundays in between
        }
    }

        long days_diff = (endDate.getTime()-startDate.getTime())/(24 * 60 * 60 * 1000)-count; //displays the days difference excluding sundays
        return new LongWritable(days_diff);

  }

}

Answer 2

使用spark，实现更容易维护


import org.joda.time.format.DateTimeFormat


def dayDiffWithExcludeWeekendAndHoliday(startDate:String,endDate:String,holidayExclusion:Seq[String]) ={ 
@transient val datePattern="yyyy-MM-dd"
@transient val dateformatter=DateTimeFormat.forPattern(datePattern)
var numWeekDaysValid=0
var numWeekends=0
var numWeekDaysInValid=0
val holidayExclusionJoda=holidayExclusion.map(dateformatter.parseDateTime(_))
val startDateJoda=dateformatter.parseDateTime(startDate)
var startDateJodaLatest=dateformatter.parseDateTime(startDate)
val endDateJoda=dateformatter.parseDateTime(endDate)
while (startDateJodaLatest.compareTo(endDateJoda) !=0)
{
startDateJodaLatest.getDayOfWeek match {
case value if value >5 => numWeekends=numWeekends+1
case value if value <= 5  => holidayExclusionJoda.contains(startDateJodaLatest) match {case value if value == true => numWeekDaysInValid=numWeekDaysInValid+1 case value if value == false => numWeekDaysValid=numWeekDaysValid+1 }
}
startDateJodaLatest = startDateJodaLatest.plusDays(1)
}
Array(numWeekDaysValid,numWeekends,numWeekDaysInValid)
}

spark.udf.register("dayDiffWithExcludeWeekendAndHoliday",dayDiffWithExcludeWeekendAndHoliday(_:String,_:String,_:Seq[String]))

case class tmpDateInfo(startDate:String,endDate:String,holidayExclusion:Array[String])
case class tmpDateInfoFull(startDate:String,endDate:String,holidayExclusion:Array[String],numWeekDaysValid:Int,numWeekends:Int,numWeekDaysInValid:Int)


def dayDiffWithExcludeWeekendAndHolidayCase(tmpInfo:tmpDateInfo) ={ 
@transient val datePattern="yyyy-MM-dd"
@transient val dateformatter=DateTimeFormat.forPattern(datePattern)
var numWeekDaysValid=0
var numWeekends=0
var numWeekDaysInValid=0
val holidayExclusionJoda=tmpInfo.holidayExclusion.map(dateformatter.parseDateTime(_))
val startDateJoda=dateformatter.parseDateTime(tmpInfo.startDate)
var startDateJodaLatest=dateformatter.parseDateTime(tmpInfo.startDate)
val endDateJoda=dateformatter.parseDateTime(tmpInfo.endDate)
while (startDateJodaLatest.compareTo(endDateJoda) !=0)
{
startDateJodaLatest.getDayOfWeek match {
case value if value >5 => numWeekends=numWeekends+1
case value if value <= 5  => holidayExclusionJoda.contains(startDateJodaLatest) match {case value if value == true => numWeekDaysInValid=numWeekDaysInValid+1 case value if value == false => numWeekDaysValid=numWeekDaysValid+1 }
}
startDateJodaLatest = startDateJodaLatest.plusDays(1)
}
tmpDateInfoFull(tmpInfo.startDate,tmpInfo.endDate,tmpInfo.holidayExclusion,numWeekDaysValid,numWeekends,numWeekDaysInValid)
}

//df way 1
val tmpDF=Seq(("2020-05-03","2020-06-08",List("2020-05-08","2020-06-05"))).toDF("startDate","endDate","holidayExclusion").select(col("startDate").cast(StringType),col("endDate").cast(StringType),col("holidayExclusion"))

tmpDF.as[tmpDateInfo].map(dayDiffWithExcludeWeekendAndHolidayCase).show(false)

//df way 2

tmpDF.selectExpr("*","dayDiffWithExcludeWeekendAndHoliday(cast(startDate as string),cast(endDate as string),cast(holidayExclusion as array<string>)) as resultDays").selectExpr("startDate","endDate","holidayExclusion","resultDays[0] as numWeekDaysValid","resultDays[1] as numWeekends","resultDays[2] as numWeekDaysInValid").show(false)


tmpDF.selectExpr("*","dayDiffWithExcludeWeekendAndHoliday(cast(startDate as string),cast(endDate as string),cast(holidayExclusion as array<string>)) as resultDays").selectExpr("startDate","endDate","holidayExclusion","resultDays[0] as numWeekDaysValid","resultDays[1] as numWeekends","resultDays[2] as numWeekDaysInValid").show(false)

// spark sql way, works with hive table when configured in hive metastore

tmpDF.createOrReplaceTempView("tmpTable")
spark.sql("select startDate,endDate,holidayExclusion,dayDiffWithExcludeWeekendAndHoliday(startDate,endDate,holidayExclusion) from tmpTable").show(false)

计算 Hive 中除星期日外的天数

Calculate number of days excluding sunday in Hive

hive

hiveql

udf