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[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, 2015-03-04, 06:44
[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, 2014-08-08, 03:31
[HIVE-1343] add an interface in RCFile to support concatenation of two files without (de)compression - Hive - [issue]
...If two files are concatenated, we need to read each record in these files and write them back to the destination file. The IO cost is mostly unavoidable due to the lack of append functionali...
http://issues.apache.org/jira/browse/HIVE-1343    Author: Ning Zhang, 2014-07-24, 23:32
[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, 2014-07-24, 23:32
[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, 2014-07-05, 09:08
[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, 2014-06-11, 06:37
[HIVE-7207] support partial rowkey scan in HBase filter pushdown - Hive - [issue]
...One of our Hive tables is backed up by Hbase (HBaseStorageHandler), to simulate the partitioned Hive Table by "DataDate", we use composite rowkey in Hbase, e.g. DataDate_Userid_Actionid_Time...
http://issues.apache.org/jira/browse/HIVE-7207    Author: Ning Zhang, 2014-06-10, 18:28
[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-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
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elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB