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[HIVE-4113] Optimize select count(1) with RCFile and Orc - Hive - [issue]
...select count(1) loads up every column & every row when used with RCFile."select count(1) from store_sales_10_rc" givesJob 0: Map: 5  Reduce: 1   Cumulative CPU: 31.73 sec  ...
http://issues.apache.org/jira/browse/HIVE-4113    Author: Gopal V, 2013-09-22, 21:57
[HIVE-4757] LazyTimestamp goes into irretrievable NULL mode once inited with NULL once - Hive - [issue]
...The LazyTimestamp.init() code turns into a NULL generator after parsing the very first NULL value (or format error). The code is as follows     Timestamp t = null;  ...
http://issues.apache.org/jira/browse/HIVE-4757    Author: Gopal V, 2013-09-06, 23:27
[HIVE-5093] Use a combiner for LIMIT with GROUP BY and ORDER BY operators - Hive - [issue]
...Operator trees of the following structure can have a memory friendly combiner put in place after the sort-phase "GBY-LIM" and "OBY-LIM"This will cut down on I/O when spilling to disk and par...
http://issues.apache.org/jira/browse/HIVE-5093    Author: Gopal V, 2013-08-28, 17:18
[HIVE-5144] HashTableSink allocates empty new Object[] arrays & OOMs - use a static emptyRow instead - Hive - [issue]
...The map-join hashtable sink in the local-task creates an in-memory hashtable with the following code. Object[] value = JoinUtil.computeMapJoinValues(row, joinValues[alias],... MapJ...
http://issues.apache.org/jira/browse/HIVE-5144    Author: Gopal V, 2013-08-28, 13:42
[HIVE-4926] Queries which specify clustered-by keys as constants will still scan all buckets - Hive - [issue]
...When tables are CLUSTERED BY (key) into multiple buckets, a query which specifies a key in the query predicate will still scan all buckets in the directory.In the ideal scenario, only bucket...
http://issues.apache.org/jira/browse/HIVE-4926    Author: Gopal V, 2013-07-24, 20:19
[HIVE-4681] Fix ORC TimestampTreeReader.nextVector() to handle milli-nano math corectly - Hive - [issue]
...The current TimestampTreeReader implementation is broken when fed only milliseconds.If TS = 222ms.   result.vector[i] = ... // == 0;   nanoVector.vector[i] = ... // == 22...
http://issues.apache.org/jira/browse/HIVE-4681    Author: Gopal V, 2013-07-18, 21:27
[HIVE-4436] hive.exec.parallel=true doesn't work on hadoop-2 - Hive - [issue]
...While running a hive query with multiple independent stages, hive.exec.parallel is a valid optimization to use.The query tested has 3 MR jobs - the first job is the root dependency and the 2...
http://issues.apache.org/jira/browse/HIVE-4436    Author: Gopal V, 2013-07-02, 18:24
[HIVE-4758] NULLs and record separators broken with vectorization branch intermediate outputs - Hive - [issue]
...Queries of type timestamp on partitioned tables return NULL for all rows of timestamp columns, if the first row in the column is NULL.This was tracked down to the failure of timestamp column...
http://issues.apache.org/jira/browse/HIVE-4758    Author: Gopal V, 2013-06-19, 23:06
[HIVE-4699] Integrate basic UDFs for Timesamp - Hive - [issue]
...Integrated the timestamp UDFs from HIVE-4608, to be able to use the following TO_UNIX_TIMESTAMP(ts), year(ts),month(ts),weekofyear(ts),dayofmonth(ts),hour(ts),minute(ts),second(ts)in queries...
http://issues.apache.org/jira/browse/HIVE-4699    Author: Gopal V, 2013-06-14, 22:58
[HIVE-4608] Vectorized UDFs for Timestamp in nanoseconds - Hive - [issue]
...Vectorized UDFs for timestamp functions which accept long vectorsVectorUDFYearLong   VectorUDFMonthLongVectorUDFWeekOfYearLong   VectorUDFDayOfMonthLongVectorUDFHourLong   Vec...
http://issues.apache.org/jira/browse/HIVE-4608    Author: Gopal V, 2013-06-04, 14:41
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