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[HIVE-1794] GenericUDFOr and GenericUDFAnd cannot receive boolean typed object - Hive - [issue]
...If a UDF returns Java's native boolean and passed into a logic AND or OR. The execution will break....
http://issues.apache.org/jira/browse/HIVE-1794    Author: Siying Dong, 2011-12-16, 23:59
[HIVE-1783] CommonJoinOperator optimize the case of 1:1 join - Hive - [issue]
...CommonJoinOperator.genObject() is expensive. It does a recursive and keeps lots of states because it has to:1. handle null cases for outer joins2. handle the case of duplicated keys from one...
http://issues.apache.org/jira/browse/HIVE-1783    Author: Siying Dong, 2011-12-16, 23:59
[HIVE-1749] ExecMapper and ExecReducer: reduce function calls to l4j.isInfoEnabled() - Hive - [issue]
...Calling l4j.isInfoEnabled() is more expensive than we thought. By eliminating this function call, we can save 1% - 3% CPU time, according to the profiliing....
http://issues.apache.org/jira/browse/HIVE-1749    Author: Siying Dong, 2011-12-16, 23:59
[HIVE-1743] Group-by to determine equals of Keys in reverse order - Hive - [issue]
...When processing group-by, in reduce side, keys are ordered. Comparing equality of two keys can be more efficient in reverse order....
http://issues.apache.org/jira/browse/HIVE-1743    Author: Siying Dong, 2011-12-16, 23:59
[HIVE-1779] Implement GenericUDF str_to_map - Hive - [issue]
...People need way to load their data to map....
http://issues.apache.org/jira/browse/HIVE-1779    Author: Siying Dong, 2011-12-16, 23:59
[HIVE-1750] Remove Partition Filtering Conditions when Possible - Hive - [issue]
...For some simple queries, partition filtering constraints take 8% of CPU time (now 16% since we filter twice) even if the result is always true. When possible, we should remove these constrai...
http://issues.apache.org/jira/browse/HIVE-1750    Author: Siying Dong, 2011-12-16, 23:59
[HIVE-1751] Optimize ColumnarStructObjectInspector.getStructFieldData() - Hive - [issue]
...ColumnarStructObjectInspector.getStructFieldData() is a heavy used function and is expensive.By optimizing this function, including ColumnarStruct.uncheckedGetField() called by it, most quer...
http://issues.apache.org/jira/browse/HIVE-1751    Author: Siying Dong, 2011-12-16, 23:59
[HIVE-1738] Optimize Key Comparison in GroupByOperator - Hive - [issue]
...GroupByOperator uses ObjectInspectorUtils.compare() to compare keys, which is written for generalized object comparisons, which is not optimized for group-by operator. By optimizing this log...
http://issues.apache.org/jira/browse/HIVE-1738    Author: Siying Dong, 2011-12-16, 23:59
[HIVE-2030] isEmptyPath() to use ContentSummary cache - Hive - [issue]
...addInputPaths() calls isEmptyPath() for every input path. Now every call is a DFS namenode call. Making isEmptyPath() to use cached ContentSummary, we should be able to avoid some namenode c...
http://issues.apache.org/jira/browse/HIVE-2030    Author: Siying Dong, 2011-12-16, 23:57
[HIVE-1991] Hive Shell to output number of mappers and number of reducers - Hive - [issue]
...Number of mappers and number of reducers are nice information to be outputted for users to know....
http://issues.apache.org/jira/browse/HIVE-1991    Author: Siying Dong, 2011-12-16, 23:57
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