Raj Hadoop 2014-02-01, 05:20
You can use explode function that is an udf in hive: like this
SELECT explode(ActivityDates) AS ActivityDates FROM myMapTable;
and think who to map the result whith rates ;)
2014-02-01 Raj Hadoop <[EMAIL PROTECTED]>:
> I have the following requirement from a Hive table below.
> CustNum ActivityDates Rates
> 100 10-Aug-13,12-Aug-13,20-Aug-13 10,15,20
> The data above says that
> From 10 Aug to 11 Aug the rate is 10.
> From 12 Aug to 19 Aug the rate is 15.
> From 20-Aug to till date the rate is 20.
> Note : The order is maintained in 'ActivityDates' and 'Rates'.
> From the above table , I need to find the rate on say a given date
> 15-Aug-13. In the above case , the rate for 15-Aug-13 is 15.
> How should I get this result in Hive.
> I was reading about a Generic UDF and was thinking to write one like this.
> The Generic UDF takes two inputs (input date , array of input dates ) .
> the output should be (an int )to return the element number in the array.
> In the above case
> Generic UDF(15-Aug-13,10-Aug-13,12-Aug-13,20-Aug-13) should return the
> 2nd element in array - 2.
> Please advise if there is an alternative solution or if the above solution
> works. I have never written a UDF or Generic UDF and would need some help
> from the forum members. Please advise.
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