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[HIVE-2146] Block Sampling should adjust number of reducers accordingly to make it useful - Hive - [issue]
...Now number of reducers of block sampling is not modified, so that queries like:select c from tab tablesample(1 percent) group by c;can generate huge number of reducers although the input is ...
http://issues.apache.org/jira/browse/HIVE-2146    Author: Siying Dong, 2011-12-16, 23:56
[HIVE-2051] getInputSummary() to call FileSystem.getContentSummary() in parallel - Hive - [issue]
...getInputSummary() now call FileSystem.getContentSummary() one by one, which can be extremely slow when the number of input paths are huge. By calling those functions in parallel, we can cut ...
http://issues.apache.org/jira/browse/HIVE-2051    Author: Siying Dong, 2011-12-16, 23:56
[HIVE-2451] TABLESAMBLE(BUCKET xxx) sometimes doesn't trigger input pruning as regression of HIVE-1538 - Hive - [issue]
...Example:select count(1) from <bucket_table> TABLESAMPLE(BUCKET xxx out of yyy) where <partition_column> = 'xxx'will not trigger input pruning.The reason is that we assume sample ...
http://issues.apache.org/jira/browse/HIVE-2451    Author: Siying Dong, 2011-12-16, 23:56
[HIVE-2248] Comparison Operators convert number types to common type instead of double if possible - Hive - [issue]
...Now if the two sides of comparison is of different type, we always convert both to double and compare. It was a slight regression from the change in https://issues.apache.org/jira/browse/HIV...
http://issues.apache.org/jira/browse/HIVE-2248    Author: Siying Dong, 2011-12-16, 23:56
[HIVE-2034] Backport HIVE-1991 after overridden by HIVE-1950 - Hive - [issue]
http://issues.apache.org/jira/browse/HIVE-2034    Author: Siying Dong, 2011-12-16, 23:55
[HIVE-2123] CommandNeedRetryException needs release locks - Hive - [issue]
...now when CommandNeedRetryException is thrown, locks are not released. Not sure whether it will cause problem, since the same locks will be acquired when retrying it. It is anyway something w...
http://issues.apache.org/jira/browse/HIVE-2123    Author: Siying Dong, 2011-08-19, 20:33
[HIVE-1802] Encode MapReduce Shuffling Keys Differently for  Single string/bigint Key - Hive - [issue]
...Delimiters are not needed if we only have one shuffling key, and in the same time escaping delimiters are not needed. We can save some CPU time on serializing and shuffle slightly less amoun...
http://issues.apache.org/jira/browse/HIVE-1802    Author: Siying Dong, 2011-01-26, 04:04
[HIVE-1752] Avoid UnionStructObjectInspector for partition columns when necessary - Hive - [issue]
...Once HIVE-1750 and HIVE-1538 are finished,  union struct for partition columns and normal columns is not needed anymore. We can save some costs by not having the struct....
http://issues.apache.org/jira/browse/HIVE-1752    Author: Siying Dong, 2010-11-11, 20:06
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