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[HIVE-1598] use SequenceFile rather than TextFile format for hive query results - Hive - [issue]
...Hive query's result is written to a temporary directory first and then FetchTask takes the files and display it to the users. Currently the file format used for the resulting file is TextFil...
http://issues.apache.org/jira/browse/HIVE-1598    Author: Ning Zhang, 2014-04-06, 23:31
[HIVE-1362] Optimizer statistics on columns in tables and partitions - Hive - [issue]
http://issues.apache.org/jira/browse/HIVE-1362    Author: Ning Zhang, 2014-03-22, 21:41
[HIVE-1511] Hive plan serialization is slow - Hive - [issue]
...As reported by Edward Capriolo:For reference I did this as a test case....SELECT * FROM src wherekey=0 OR key=0 OR key=0 OR  key=0 OR key=0 OR key=0 OR key=0 OR key=0OR key=0 OR key=0 O...
http://issues.apache.org/jira/browse/HIVE-1511    Author: Ning Zhang, 2014-01-19, 08:24
[HIVE-784] Support uncorrelated subqueries in the WHERE clause - Hive - [issue]
...Hive currently only support views in the FROM-clause, some Facebook use cases suggest that Hive should support subqueries such as those connected by IN/EXISTS in the WHERE-clause....
http://issues.apache.org/jira/browse/HIVE-784    Author: Ning Zhang, 2013-11-15, 03:42
[HIVE-1558] introducing the "dual" table - Hive - [issue]
...The "dual" table in MySQL and Oracle is very convenient in testing UDFs or constructing rows without reading any other tables. If dual is the only data source we could leverage the local mod...
http://issues.apache.org/jira/browse/HIVE-1558    Author: Ning Zhang, 2013-10-18, 00:16
[HIVE-2084] Upgrade datanucleus from 2.0.3 to a more recent version (3.?) - Hive - [issue]
...It seems the datanucleus 2.2.3 does a better join in caching. The time it takes to get the same set of partition objects takes about 1/4 of the time it took for the first time. While with 2....
http://issues.apache.org/jira/browse/HIVE-2084    Author: Ning Zhang, 2013-07-26, 16:36
[HIVE-2048] Expedite Partition Pruning - Hive - [issue]
...Partition pruning is a large part of Hive client side overhead. Partition filter has been introduced by HIVE-1609, but it is enabled due to JDO issues (HIVE-1853, HIVE-1862). This JIRA is cr...
http://issues.apache.org/jira/browse/HIVE-2048    Author: Ning Zhang, 2013-07-16, 02:19
[HIVE-2512] After HIVE-2145, Hive disallow any use of function in cluster-by clause - Hive - [issue]
...After HIVE-2145, the following query returns a semantic analysis error: FROM src SELECT * cluster by rand();FAILED: Error in semantic analysis: functions are not supported in order byLooking...
http://issues.apache.org/jira/browse/HIVE-2512    Author: Ning Zhang, 2013-07-07, 17:01
[HIVE-747] void type (null column) cannot be UNIONed with other type - Hive - [issue]
...hive> select * from (select NULL from zshao_tt union all select 1 from zshao_tt)x;select * from (select NULL from zshao_tt union all select 1 from zshao_tt)x;FAILED: Error in semantic ana...
http://issues.apache.org/jira/browse/HIVE-747    Author: Ning Zhang, 2013-05-14, 09:07
[HIVE-1309] let user specify "bad file" rather than HIVE_DEFAULT_PARTITION in dynamic partition insert - Hive - [issue]
...Currently if the dynamic partition column value is "bad" – null, empty string, etc., the row will be put into the _HIVE_DEFAULT_PARTITION_ where the bad column value will be lost (repl...
http://issues.apache.org/jira/browse/HIVE-1309    Author: Ning Zhang, 2013-04-20, 23:16
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