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[HIVE-16282] Semijoin: Disable slow-start for the bloom filter aggregate task
...The slow-start of the bloom filter vertex is a scheduling problem which causes more pre-emption than is useful.When the bloom filters are arranged as followsMap 1(10 tasks)>Reducer 2(1 ta...
, 2017-03-25, 00:58
[HIVE-16208] Vectorization: ProcessingModeHashAggregate::sumBatchSize is never reset
...When processing >2x the hash-table size in the vectorized group-by, the check for fall-back to streaming is wrong because sumBatchSize*minReduction is not reset when processing the next s...
, 2017-03-23, 17:47
[HIVE-15789] Vectorization: limit reduce vectorization to 32Mb chunks
...Reduce vectorization accumulates 1024 rows before forwarding it into the reduce processor.Add a safety limit for 32Mb of writables, so that shorter sequences can be forwarded into the operat...
, 2017-03-22, 21:03
[HIVE-16113] PartitionPruner::removeNonPartCols needs to handle AND/OR cases
...create table daysales (customer int) partitioned by (dt string);insert into daysales partition(dt='2001-01-01') values(1);select * from daysales where nvl(dt='2001-01-01' and customer=1, fal...
, 2017-03-22, 21:02
[HIVE-15573] Vectorization: Non-Uniform shuffle ReduceSink is not specialized
...The non-uniform shuffle disabled murmur hash for the shuffle, due to the bucketing requirements demanding the writable hashcode for the shuffles. boolean useUniformHash = desc.g...
, 2017-03-20, 06:05
[HIVE-14016] Vectorization: Add support for Grouping Sets
...Rollup and Cube queries are not vectorized today due to the miss of grouping-sets inside vector group by.The cube and rollup operators can be shimmed onto the end of the pipeline by converti...
, 2017-03-19, 15:38
[HIVE-16182] Semijoin: Avoid VectorHashKeyWrapper allocations for the bloom hash aggregate
...To avoid GC spam during the hash aggregate part of the bloom filter, the key for the semijoin can be special-cased as an immutable empty key....
, 2017-03-13, 17:43
[HIVE-12492] MapJoin: 4 million unique integers seems to be a probe plateau
...After 4 million keys, the map-join implementation seems to suffer from a performance degradation. The hashtable build & probe time makes this very inefficient, even if the data is very c...
, 2017-03-08, 04:12
[HIVE-16100] Dynamic Sorted Partition optimizer loses sibling operators
...https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/optimizer/SortedDynPartitionOptimizer.java#L173 // unlink connection between FS and its p...
, 2017-03-06, 19:30
[HIVE-16050] Regression: Union of null with non-null
...hive> select null as c1 union select 1 as c2; FAILED: SemanticException Schema of both sides of union should match: Column c1 is of type void on first table and type int on s...
, 2017-03-01, 12:29
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