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[HIVE-3871] show number of mappers/reducers as part of explain extended
...It would be useful to show the number of mappers/reducers as part of explain extended.For the MR jobs referencing intermediate data, the number can be approximate....
, 2013-01-18, 05:05
[HIVE-965] optimize skewed joins
...As a followup of https://issues.apache.org/jira/browse/HIVE-964, the joins for the skewed keys can be performed by using techniques similar to http://wiki.apache.org/pig/PigSkewedJoinSpec...
, 2013-01-14, 22:50
[HIVE-1283] map join does not stream the big tables
...Currently, all the keys from the big table are read before the join is performed.It might be very slow if there is a hue skew, it might be a good optimization to stream the larger table...
, 2013-01-14, 22:46
[HIVE-2555] Make the hashmap in map-side group by pluggable
...There are a couple of implementations available (other than java.util.HashMap) - COLT, TROVE etc. to name a few.If the hashmap was pluggable, it would be easy to play around with different h...
, 2013-01-14, 22:33
[HIVE-3426] union with same source should be optimized
, 2013-01-14, 22:09
[HIVE-3824] bug if different serdes are used for different partitions
...Consider the following testcase:create table tst5 (key string, value string) partitioned by (ds string) stored as rcfile;insert overwrite table tst5 partition (ds='1') select * from src; &nb...
, 2013-01-14, 22:05
[HIVE-3042] Thrift classes do not need to be passed to the mappers and reducers
, 2013-01-13, 23:36
[HIVE-3803] explain dependency should show the dependencies hierarchically in presence of views
...It should also include tables whose partitions are being accessed...
, 2013-01-13, 12:56
[HIVE-942] use bucketing for group by
...Group by on a bucketed column can be completely performed on the mapper if the split can be adjusted to span the key boundary....
, 2013-01-11, 23:27
[HIVE-3888] wrong mapside groupby if no partition is being selected
, 2013-01-11, 20:34
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