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[HIVE-948] more query plan optimization rules - Hive - [issue]
...Many query plans are not optimal in that they contain redundant operators. Some examples are unnecessary select operators (select followed by select, select output being the same as input et...
http://issues.apache.org/jira/browse/HIVE-948    Author: Ning Zhang, 2013-02-26, 05:24
[HIVE-2017] Driver.execute() should maintaining SessionState in case of runtime errors - Hive - [issue]
...Here's a snippet from Driver.execute():            // TODO: This error messaging is not very informative. Fix that.          ...
http://issues.apache.org/jira/browse/HIVE-2017    Author: Ning Zhang, 2013-02-25, 21:39
[HIVE-1361] table/partition level statistics - Hive - [issue]
...At the first step, we gather table-level stats for non-partitioned table and partition-level stats for partitioned table. Future work could extend the table level stats to partitioned table ...
http://issues.apache.org/jira/browse/HIVE-1361    Author: Ning Zhang, 2013-01-19, 02:14
[HIVE-3586] External partition - Hive - [issue]
...External tables are extremely useful when two or more tables share the same data but would like to avoid the data copy and ownership conflicts. We found it useful to extend the "external" co...
http://issues.apache.org/jira/browse/HIVE-3586    Author: Ning Zhang, 2012-10-16, 19:07
[HIVE-2050] batch processing partition pruning process - Hive - [issue]
...For partition predicates that cannot be pushed down to JDO filtering (HIVE-2049), we should fall back to the old approach of listing all partition names first and use Hive's expression evalu...
http://issues.apache.org/jira/browse/HIVE-2050    Author: Ning Zhang, 2012-08-21, 08:48
[HIVE-2049] Push down partition pruning to JDO filtering for a subset of partition predicates - Hive - [issue]
...Several tasks: expose HiveMetaStoreClient.listPartitionsByFilter() to Hive.java so that PartitionPruner can use that for certain partition predicates. figure out a safe subset of partition p...
http://issues.apache.org/jira/browse/HIVE-2049    Author: Ning Zhang, 2012-08-21, 08:48
[HIVE-2187] Mappers across multiple partitions with different SerDe failed - Hive - [issue]
...If 2 partitions have the same input file format, but different serde, we should not combine them into the same mapper. Otherwise the mapper will fail....
http://issues.apache.org/jira/browse/HIVE-2187    Author: Ning Zhang, 2012-08-03, 06:39
[HIVE-1901] ColumnPruner bug in case of LATERAL VIEW and UDTF - Hive - [issue]
...The following query EXPLAIN SELECT stat FROM (SELECT nt.value AS n, dt.value AS d_evt, nt.hr as hrFROM srcpart ntJOIN srcpart dtON (nt.ds='2008-04-08' AND dt.ds='2008-04-08' AND nt.key=dt.ke...
http://issues.apache.org/jira/browse/HIVE-1901    Author: Ning Zhang, 2012-07-25, 04:17
[HIVE-2035] Use block-level merge for RCFile if merging intermediate results are needed - Hive - [issue]
...Currently if hive.merge.mapredfiles and/or hive.merge.mapfile is set to true the intermediate data could be merged using an additional MapReduce job. This could be quite expensive if the dat...
http://issues.apache.org/jira/browse/HIVE-2035    Author: Ning Zhang, 2012-07-17, 01:16
[HIVE-1101] Extend Hive ODBC to support more functions - Hive - [issue]
...Currently Hive ODBC driver only support a a minimum list of functions to ensure some application work. Some other applications require more function support. These functions include:*SQLCanc...
http://issues.apache.org/jira/browse/HIVE-1101    Author: Ning Zhang, 2012-06-29, 21:41
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