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[HIVE-7923] populate stats for test tables - Hive - [issue]
...Current q_test only generates tables, e.g., src only but does not create status. All the test cases will fail in CBO because CBO depends on the status....
http://issues.apache.org/jira/browse/HIVE-7923    Author: pengcheng xiong, 2014-09-06, 21:03
[HIVE-7944] current update stats for columns of a partition of a table is not correct - Hive - [issue]
...We worked hard towards faster update stats for columns of a partition of a table previously https://issues.apache.org/jira/browse/HIVE-7736andhttps://issues.apache.org/jira/browse/HIVE-7876A...
http://issues.apache.org/jira/browse/HIVE-7944    Author: pengcheng xiong, 2014-09-04, 23:05
[HIVE-7876] further improve the columns stats update speed for all the partitions of a table - Hive - [issue]
...The previous solution HIVE-7736 is not enough for the case when there are too many columns/partitions.The user will encounter org.apache.thrift.transport.TTransportException: java.net.Socket...
http://issues.apache.org/jira/browse/HIVE-7876    Author: pengcheng xiong, 2014-09-04, 22:18
[HIVE-7925] extend current partition status extrapolation to support all DBs - Hive - [issue]
...extend current partition status extrapolation only supports Derby.That is why we got errors such as https://hortonworks.jira.com/browse/BUG-21983...
http://issues.apache.org/jira/browse/HIVE-7925    Author: pengcheng xiong, 2014-09-01, 02:42
[HIVE-7654] A method to extrapolate columnStats for partitions of a table - Hive - [issue]
...In a PARTITIONED table, there are many partitions. For example, create table if not exists loc_orc (  state string,  locid int,  zip bigint) partitioned by(year...
http://issues.apache.org/jira/browse/HIVE-7654    Author: pengcheng xiong, 2014-08-25, 05:22
[HIVE-7736] improve the columns stats update speed for all the partitions of a table - Hive - [issue]
...The current implementation of columns stats update for all the partitions of a table takes a long time when there are thousands of partitions. For example, on a given cluster, it took 600+ s...
http://issues.apache.org/jira/browse/HIVE-7736    Author: pengcheng xiong, 2014-08-22, 16:36
[HIVE-7506] MetadataUpdater: provide a mechanism to edit the statistics of a column in a table (or a partition of a table) - Hive - [issue]
...Two motivations:(1) Cost-based Optimizer (CBO) depends heavily on the statistics of a column in a table (or a partition of a table). If we would like to test whether CBO chooses the best pla...
http://issues.apache.org/jira/browse/HIVE-7506    Author: pengcheng xiong, 2014-08-14, 08:18
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