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Re: count of distinct FROM multiple columns - Hive - [mail # user]
...Hi  A quick solution that comes first to my mind is to join the columns you want to combine into an array and then use the explode UDTF:  SELECT col1, COUNT(distinct combined) FROM...
   Author: Jan Dolinár, 2012-06-22, 12:52
[expand - 1 more] - Re: UDTF fails when used in LATERAL VIEW - Hive - [mail # user]
...Hi Mark,  Thanks for suggestion, it is not that naïve :) I tried a lot of things and combinations, including Text and even LazyString (as I was getting exceptions about converting Strin...
   Author: Jan Dolinár, 2012-06-22, 05:59
[expand - 1 more] - Re: Quering RDBMS table in a Hive query - Hive - [mail # user]
...On 6/15/12, Ruslan Al-Fakikh  wrote:  Both is possible, InputFormat and/or UD(T)F. It all depends on what you need. I actually use both - in Input format I load lists of allowed va...
   Author: Jan Dolinár, 2012-06-15, 12:35
[expand - 5 more] - Re: Multi-group-by select always scans entire table - Hive - [mail # user]
...Thank you very much Mark for your investigation and explanations.  I'm well aware of the fact that hadoop 0.7.1 is quite an old code and that newer version might perform better - that i...
   Author: Jan Dolinár, 2012-06-08, 05:42
[expand - 2 more] - Re: Multi-GroupBy-Insert optimization - Hive - [mail # user]
...Hi Shan,  If you happen to have a lot of repeated data (in the most general grouping), you might get some speedup by little pre-aggregation. The following code should produce the same r...
   Author: Jan Dolinár, 2012-06-05, 12:47
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