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[HIVE-4386] max() and min() return NULL on partition column; distinct() returns nothing - Hive - [issue]
...partitioned_table is partitioned on year, month, day.> select max(day) from partitioned_table where year=2013 and month=4;spins up zero mappers, one reducer, and returns NULL.  Same ...
http://issues.apache.org/jira/browse/HIVE-4386    Author: Robin Morris, 2014-01-05, 13:01
[expand - 1 more] - Re: UDAF terminatePartial structure - Hive - [mail # user]
...There are limitations as to what can be passed between terminatePartial() and merge() I'm not sure that you can pass java arrays (i.e. your double[] c1;) through all the hive reflection gubb...
   Author: Robin Morris, 2013-07-30, 06:04
[expand - 1 more] - Re: Need urgent help in hive query - Hive - [mail # user]
...It probably won't make a difference to performance — the subqueries will be executed in separate map-reduce jobs, and the output put on disk anyway.  First, get it to work; second, opti...
   Author: Robin Morris, 2013-06-28, 19:41
[expand - 1 more] - Re: max() returns NULL on partition column - Hive - [mail # user]
...Thanks for confirming that I wasn't imagining this. Turns out this was a known bug (HIVE-2955 https://issues.apache.org/jira/browse/HIVE-2955 ) and is already fixed in version 0.10.0  R...
   Author: Robin Morris, 2013-04-22, 22:54
CHAN (Comprehensive Hive Archive Network) (Was Re: Using Reflect: A thread for ideas) - Hive - [mail # user]
...I think we need to think a little bigger than this.  Recently I've been thinking that what would be most useful to the Hive user community would be a CHAN – Comprehensive Hive Archive N...
   Author: Robin Morris, 2013-02-14, 06:59
Re: Help to solve UDAF errors! - Hive - [mail # user]
...Hi,  You might well have found the error yourself by now, but if not, the problem is that you missed the "static" keyword off the declaration of TopNPercentEvaluator.  Line 18 of y...
   Author: Robin Morris, 2013-02-14, 01:02
Re: question about machine learning on Hive - Hive - [mail # user]
...In a similar way, ML algorithms can be put into a Hive UDAF.  I'm working on this at the moment, and it's proved quite straightforward to integrate liblinear into a UDAF.  As Igor ...
   Author: Robin Morris, 2013-01-18, 04:57
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