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[HIVE-1018] pushing down group-by before joins - Hive - [issue]
...Queries with both Group-by and Joins are very common and they are expensive operations. By default Hive evalutes Joins first then group-by. Sometimes it is possible to rewrite queries to app...
http://issues.apache.org/jira/browse/HIVE-1018    Author: Ning Zhang, 2010-08-23, 22:34
Re: get_json_object cannot handle array - Hive - [mail # user]
...You are right. You need a function to parse JSON arrays to Hive arrays.  On Aug 18, 2010, at 6:37 PM, Steven Wong wrote:  That doesn’t sound like it would work, because explode tak...
   Author: Ning Zhang, 2010-08-19, 04:16
Re: Why two map stages for a simple select query? - Hive - [mail # user]
...We have a plan to migrate to the new mapreduce API, but probably not very s oon.   On Aug 18, 2010, at 1:13 AM, Leo Alekseyev wrote:   good idea. Actually this is what HIVE-1307 wi...
   Author: Ning Zhang, 2010-08-18, 23:58
[HIVE-1544] Filtering out NULL-keyed rows in ReduceSinkOperator when no outer join involved - Hive - [issue]
...As discussed in HIVE-741, if a plan indicates that a non-outer join is the first operator in the reducer, the ReduceSinkOperator should filter out (not sending) rows with NULL as keys since ...
http://issues.apache.org/jira/browse/HIVE-1544    Author: Ning Zhang, 2010-08-18, 09:43
Re: Dynamic Partition Inserts - Hive - [mail # user]
...Dynamic partition is supported in hive 0.6+. 0.6 is not officially released  yet, but you can find the branch at http://svn.apache.org/repos/asf/hadoop /hive/branches/branch-0.6.  ...
   Author: Ning Zhang, 2010-08-16, 16:47
Re: How are nulls represented in data? - Hive - [mail # user]
...How it is serialized/deserialized is determined by specific serde. NULL is  serialized as \N by SimpleLazySerDe (default serde for text). RCFile (Colum narSerDe) uses the same default p...
   Author: Ning Zhang, 2010-08-09, 18:46
Re: why is slow when use OR clause instead of IN clause - Hive - [mail # user]
...I tested (1000 disjunctions) and it was extremely slow but no OOM. The issu e seems to be the fact that we serialize the plan by writing to HDFS file d irectly. We probably should cache it l...
   Author: Ning Zhang, 2010-08-04, 18:07
Re: how to prevent user from dropping table created by another user - Hive - [mail # user]
...Siying is working on a JIRA (HIVE-1413) addressing exactly the issue (non-d ropable tables).  On Aug 4, 2010, at 10:25 AM, Bakshi, Ankita wrote:    Thanks Carl for the pointer...
   Author: Ning Zhang, 2010-08-04, 17:36
Re: Missing fb303.a in 64bit libthrift - Hive - [mail # user]
...I've uploaded a complete 64 bit thrift library and binaries (thrift_64.r790 732.tgz) to HIVE-187. This include libfb303.a and libfb303.jar. Let's know  if it works.  Thanks, Ning &...
   Author: Ning Zhang, 2010-06-24, 05:53
Re: alter table add partition error - Hive - [mail # user]
...We also use thrift for hive.metastore.uris. Then at the thrift server side,  we use JDBC to mysql (javax.jdo.option.ConnectionURL). Can you check your  thrift server side to see th...
   Author: Ning Zhang, 2010-06-18, 18:51
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