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[HIVE-7490] Revert ORC stripe size - Hive - [issue]
...HIVE-6037 reverted the changes to ORC stripe size introduced by HIVE-7231....
http://issues.apache.org/jira/browse/HIVE-7490    Author: Prasanth J, 2014-08-10, 00:23
[HIVE-7219] Improve performance of serialization utils in ORC - Hive - [issue]
...ORC uses serialization utils heavily for reading and writing data. The bitpacking and unpacking code in writeInts() and readInts() can be unrolled for better performance. Also double reader/...
http://issues.apache.org/jira/browse/HIVE-7219    Author: Prasanth J, 2014-08-09, 20:41
[HIVE-6578] Use ORC file footer statistics through StatsProvidingRecordReader interface for analyze command - Hive - [issue]
...ORC provides file level statistics which can be used in analyze partialscan and noscan cases to compute basic statistics like number of rows, number of files, total file size and raw data si...
http://issues.apache.org/jira/browse/HIVE-6578    Author: Prasanth J, 2014-08-07, 09:04
[HIVE-7589] Some fixes and improvements to statistics annotation rules - Hive - [issue]
...FIXES:1) JOIN rule does not properly propagate the column statistics from its parent2) Multi-way join rule computes the denominator for #rows estimation wrongly3) GROUPBY rule does not accou...
http://issues.apache.org/jira/browse/HIVE-7589    Author: Prasanth J, 2014-08-06, 19:33
[HIVE-6287] batchSize computation in Vectorized ORC reader can cause BufferUnderFlowException when PPD is enabled - Hive - [issue]
...nextBatch() method that computes the batchSize is only aware of stripe boundaries. This will not work when predicate pushdown (PPD) in ORC is enabled as PPD works at row group level (stripe ...
http://issues.apache.org/jira/browse/HIVE-6287    Author: Prasanth J, 2014-07-31, 19:46
[HIVE-6382] PATCHED_BLOB encoding in ORC will corrupt data in some cases - Hive - [issue]
...In PATCHED_BLOB encoding (added in HIVE-4123), gapVsPatchList is an array of long that stores gap (g) between the values that are patched and the patch value (p). The maximum distance of gap...
http://issues.apache.org/jira/browse/HIVE-6382    Author: Prasanth J, 2014-07-31, 19:44
[HIVE-6711] ORC maps uses getMapSize() from MapOI which is unreliable - Hive - [issue]
...HIVE-6707 had issues with map size. getMapSize() of LazyMap and LazyBinaryMap does not deserialize the keys and count the number of unique keys. Since getMapSize() may return non-distinct co...
http://issues.apache.org/jira/browse/HIVE-6711    Author: Prasanth J, 2014-07-31, 19:39
[HIVE-7536] Make use of decimal column statistics in statistics annotation - Hive - [issue]
...HIVE-6701 added decimal column statistics. The statistics annotation optimizer should make use of decimal column statistics as well....
http://issues.apache.org/jira/browse/HIVE-7536    Author: Prasanth J, 2014-07-29, 23:45
[HIVE-7535] Make use of number of nulls column statistics in filter rule - Hive - [issue]
...The filter rule does not make use of number of nulls column statistics for "IS NULL" and "IS NOT NULL" expression evaluation....
http://issues.apache.org/jira/browse/HIVE-7535    Author: Prasanth J, 2014-07-29, 23:25
[HIVE-7491] Stats annotation fails to evaluate constant expressions in filter operator - Hive - [issue]
...HIVE-5369 added stats annotation to operator plan. The filter operator evaluates all expression node descriptors and applies rules. It always returns 0 for constant expressions like 'select ...
http://issues.apache.org/jira/browse/HIVE-7491    Author: Prasanth J, 2014-07-24, 23:01
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