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[HIVE-3669] Support queries in which input tables of correlated MR jobs involves intermediate tables - Hive - [issue]
...Correlation optimizer implemented in HIVE-2206 does not optimize correlated MapReduce jobs which have intermediate tables as input.Here is an example originally posted in HIVE-3430select * f...
http://issues.apache.org/jira/browse/HIVE-3669    Author: Yin Huai, 2012-11-05, 15:03
[HIVE-3668] Merge MapReduce jobs which share input tables and the same partitioning keys into a single MapReduce job - Hive - [issue]
...In the plan of a query, if there exists MapReduce jobs created for aggregation operators or join operators which share one or more input tables and use the same partitioning keys to shuffle ...
http://issues.apache.org/jira/browse/HIVE-3668    Author: Yin Huai, 2012-11-05, 14:49
[HIVE-3511] Constant values in aggregation parameters should not be attached to every map output row - Hive - [issue]
...When map-side-aggregation is disabled (hive.map.aggr=false), constant values in aggregation parameters are attached to every map output row. For example, in test case 'count.q' (https://gith...
http://issues.apache.org/jira/browse/HIVE-3511    Author: Yin Huai, 2012-09-28, 01:48
aggName in SemanticAnalyzer.getGenericUDAFEvaluator - Hive - [mail # dev]
...Hello All,  The method of org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.getGenericUDAFEvaluator(String, ArrayList, ASTNode, boolean, boolean) is called from three methods, which are ...
   Author: Yin Huai, 2012-09-14, 21:06
configuring log4j for unit tests - Hive - [mail # dev]
...Hello All,  When I run hive unit tests, I always can find an error saying the class of org.apache.hadoop.log.metrics.EventCounter can not be found. Seems the reason is that in hadoop 0....
   Author: Yin Huai, 2012-09-12, 16:57
Re: ColumnarSerDe and LazyBinaryColumnarSerDe - Hive - [mail # user]
...Thanks.  I forgot to consider the DOUBLE data type in the table. For the case of lineitem, ColumnarSerDe can use less bytes to store a double than LazyBinaryColumnarSerDe (8bytes). &nbs...
   Author: Yin Huai, 2012-03-07, 18:35
Re: RCFile in java MapReduce - Hive - [mail # user]
...I have some experiences using RCFile with new MapReduce API from the project HCatalog ( http://incubator.apache.org/hcatalog/ ).  For the output part, In your main, you need ...   ...
   Author: Yin Huai, 2012-01-10, 03:16
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