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[HIVE-6247] select count(distinct) should be MRR in Tez - Hive - [issue]
...The MR query plan for "select count(distinct) " fires off multiple reducers, with a local work task to perform final aggregation.The Tez version fires off exactly 1 reducer for the entire da...
http://issues.apache.org/jira/browse/HIVE-6247    Author: Gopal V, 2014-02-03, 23:09
[HIVE-4114] hive-metastore.jar depends on jdo2-api:jar:2.3-ec, which is missing in maven central - Hive - [issue]
...Adding hive-exec-0.10.0 to an independent pom.xml results in the following error    Failed to retrieve javax.jdo:jdo2-api-2.3-ecCaused by: Could not find artifact javax.jdo:jd...
http://issues.apache.org/jira/browse/HIVE-4114    Author: Gopal V, 2013-12-03, 18:31
[HIVE-5663] Refactor ORC RecordReader to operate on direct & wrapped ByteBuffers - Hive - [issue]
...The current ORC RecordReader implementation assumes array structures backing the ByteBuffers it passes around between RecordReaderImpl and Compressed/Uncompressed InStream objects.This patch...
http://issues.apache.org/jira/browse/HIVE-5663    Author: Gopal V, 2013-11-20, 21:06
[HIVE-5834] Avoid reading ORC footers for files which will not be split in OrcInputFormat::getSplits() - Hive - [issue]
...OrcInputFormat::getSplits() fires off a SplitGenerator task for every file in the task.The footer & data are on the same node for all files with only 1 hdfs block. On top of that, it wil...
http://issues.apache.org/jira/browse/HIVE-5834    Author: Gopal V, 2013-11-15, 22:51
[HIVE-3997] Use distributed cache to cache/localize dimension table & filter it in map task setup - Hive - [issue]
...The hive clients are not always co-located with the hadoop/hdfs cluster.This means that the dimension table filtering, when done on the client side becomes very slow. Not only that, the conv...
http://issues.apache.org/jira/browse/HIVE-3997    Author: Gopal V, 2013-11-15, 21:45
[HIVE-4694] Fix ORC TestVectorizedORCReader testcase for Timestamps - Hive - [issue]
...ORC vectorized tests were not testing for timestamps correctly.java.sql.Timestamp is a confusing API, because of the mix of getTime() & getNanos() usage. Though it might look like they r...
http://issues.apache.org/jira/browse/HIVE-4694    Author: Gopal V, 2013-10-23, 22:59
[HIVE-4884] ORC TimestampTreeReader.nextVector() off by a second when time in fractional - Hive - [issue]
...When using negative timestamps, the ORC vectorized Timestampreader does the followingresult.vector[i] = (result.vector[i] * 1000000) + nanoVector.vector[i];This suffers from inaccuracies bec...
http://issues.apache.org/jira/browse/HIVE-4884    Author: Gopal V, 2013-10-23, 22:59
[HIVE-4423] Improve RCFile::sync(long) 10x - Hive - [issue]
...RCFile::sync(long) takes approx ~1 second everytime it gets called because of the inner loops in the function.From what was observed with HDFS-4710, single byte reads are an order of magnitu...
http://issues.apache.org/jira/browse/HIVE-4423    Author: Gopal V, 2013-10-16, 00:31
[HIVE-5345] Operator::close() leaks Operator::out, holding reference to buffers - Hive - [issue]
...When processing multiple splits on the same operator pipeline, the output collector in Operator has a held reference, which causes issues.Operator::close() does not de-reference the OutputCo...
http://issues.apache.org/jira/browse/HIVE-5345    Author: Gopal V, 2013-09-25, 19:27
[HIVE-5170] Sorted Bucketed Partitioned Insert hard-codes the reducer count == bucket count - Hive - [issue]
...When performing a hive sorted-partitioned insert, the insert optimizer hard-codes the number of output files to the actual bucket count of the table.https://github.com/apache/hive/blob/trunk...
http://issues.apache.org/jira/browse/HIVE-5170    Author: Gopal V, 2013-09-23, 16:46
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