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[HIVE-1651] ScriptOperator should not forward any output to downstream operators if an exception is happened
...ScriptOperator spawns 2 threads for getting the stdout and stderr from the script and then forward the output from stdout to downstream operators. In case of any exceptions to the script (e....
, 2010-10-18, 21:54
[HIVE-1669] non-deterministic display of storage parameter in test
...With the change to beautify the 'desc extended table', the storage parameters are displayed in non-deterministic manner (since its implementation is HashMap)....
, 2010-10-13, 04:29
[HIVE-1602] List Partitioning
...Dynamic partition inserts create partitions bases on the dynamic partition column values. Currently it creates one partition for each distinct DP column value. This could result in skews in ...
, 2010-08-27, 23:25
[HIVE-1585] Customizable merge output size
...Currently if hive.merge.[mapfiles|mapredfiles] is true and the merged output file size is determined by the input split size which is determined by mapred.min.split.size, mapred.min....
, 2010-08-23, 22:36
[HIVE-1018] pushing down group-by before joins
...Queries with both Group-by and Joins are very common and they are expensive operations. By default Hive evalutes Joins first then group-by. Sometimes it is possible to rewrite queries to app...
, 2010-08-23, 22:34
[HIVE-1544] Filtering out NULL-keyed rows in ReduceSinkOperator when no outer join involved
...As discussed in HIVE-741, if a plan indicates that a non-outer join is the first operator in the reducer, the ReduceSinkOperator should filter out (not sending) rows with NULL as keys since ...
, 2010-08-18, 09:43
[HIVE-1139] GroupByOperator sometimes throws OutOfMemory error when there are too many distinct keys
...When a partial aggregation performed on a mapper, a HashMap is created to keep all distinct keys in main memory. This could leads to OOM exception when there are too many distinct keys for a...
, 2010-06-16, 18:36
[HIVE-1239] Make the reducer limit-aware
...Currently if a join followed by a limit operator, the reducer still need to do a lot of work even after the limit is reached. A plan could look like:ExecReducer -> ExtractOperator -> L...
, 2010-06-16, 01:59
[HIVE-1313] Extend WriteEntity with PreExecWriteEntity and PostExecWritenEntity
...WriteEntity is used for pre and post-execution hooks. Currently when a WriteEntity is created, it will be added to both pre and post execution hooks. In some situations (e.g., dynamic partit...
, 2010-04-16, 19:12
[HIVE-1034] Predicate pushdown should work with single insert in the form of FROM TABLE INSERT ... SELECT ... WHERE. ..pred
...One sample query is FROM a JOIN b ON a.eid = b.eid AND a.ds>='2009-10-01' AND a.ds<='2009-12-01' AND b.ds>='2009-10-01' AND b.ds<='2009-12-01'INSERT OVERWRITE TABLE t SELECT a.us...
, 2010-01-07, 23:03
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