Calculate number of days excluding sunday in Hive - hive

Question

I have two timestamps as input. I want to calculate the time difference in hours between those timestamps excluding Sundays.
I can get the number of days using datediff function in hive.
I can get the day of a particular date using from_unixtime(unix_timestamp(startdate), 'EEEE').
But I dont know how to relate those functions to achieve my requirement or is there any other easy way to achieve this.
Thanks in Advance.

Answer 1

You can write one custom UDF which takes two columns containing the dates as inputs and counts the difference between the dates excluding sundays.
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

Use spark so that It will be more easy to implement and maintain
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)