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Re: can i define an udf which can process more than one argument? - Hive - [mail # user]
...Hi Chris,  Of course it is possible to write UDF with as many parameters as you want, even with variable number of arguments. Have a look at the nice article from Mark Grover [1] about ...
   Author: Jan Dolinár, 2012-10-19, 05:17
Re: Help in hive query - Hive - [mail # user]
...Hi Manu,  I believe the last "group by q2.auth_count" is wrong, because it causes computing average only across lines with same value of q2.auth_count, which is of course equal to its v...
   Author: Jan Dolinár, 2012-10-10, 06:30
Re: Aggregate Multiple Columns - Hive - [mail # user]
...Hi Richin,  Do you mean summing the values from two columns into one number, or calculating sum of both columns into two sums in one query? Both is possible, the first can be done simpl...
   Author: Jan Dolinár, 2012-08-16, 16:06
Re: load data inot hive using shell script - Hive - [mail # user]
...I'd suggest you to read a bit about shell scripts... To make this work you have to pass the queries to the hive via -e option. The way you wrote it, interactive cli would be run and the quer...
   Author: Jan Dolinár, 2012-08-09, 14:02
Re: Running the HiveQL from the shell prompt. - Hive - [mail # user]
...The shell will interpret the query in your command as SELECT ...  explode(split(timestamps, *#*)) ... if you run it the way you wrote it, i.e. without the quotation. The way around this...
   Author: Jan Dolinár, 2012-08-08, 05:01
[expand - 5 more] - Re: Custom UserDefinedFunction in Hive - Hive - [mail # user]
...Right, no need for the function at all. Sorry it is getting late here and my brain refuses to work any more :)   On Tue, Aug 7, 2012 at 8:39 PM, Techy Teck  wrote:  rote: e: w...
   Author: Jan Dolinár, 2012-08-07, 18:42
Re: Changing table types from managed to external - Hive - [mail # user]
...Hi George,  You can save yourself one copying. Just create a new external table with different name, fill it with data (either by copying or query like INSERT OVERWRITE DIRECTORY '/new/...
   Author: Jan Dolinár, 2012-08-07, 06:21
Re: Performance tuning a hive query - Hive - [mail # user]
...There are many ways, but beware that some of them may result in worse performance when used inappropriately.  Some of the settings we use to achieve faster queries: hive.map.aggr=true h...
   Author: Jan Dolinár, 2012-07-19, 13:39
Re: separator within primitive fields - Hive - [mail # user]
...Hi,  You can use something like  where instr(field1, 'test1')>=0  It is simple but not very reliable. Better solution is probably  where array_contains(split(field1, '...
   Author: Jan Dolinár, 2012-06-28, 15:32
Re: join string in hive udf - Hive - [mail # user]
...Hi,  Check the hadoop logs of the failed task. My best guess is that there is an uncaught exception thrown somewhere in your code. The logs will tell where and what caused the problem. ...
   Author: Jan Dolinár, 2012-06-26, 14:36
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