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[HIVE-7833] Remove unwanted allocation in ORC RunLengthIntegerWriterV2 determine encoding function
...RunLengthIntegerWriterV2.determineEncoding() is used heavily. There are unwanted buffer allocation for every invocation of the function which are not required....
, 2014-08-22, 18:26
[HIVE-7836] Ease-out denominator for multi-attribute join case in statistics annotation
...In cases where number of relations involved in join is less than the number of join attributes the denominator of join rule can get larger resulting in aggressive row count estimation....
, 2014-08-22, 16:30
[HIVE-7734] Join stats annotation rule is not updating columns statistics correctly
...HIVE-7679 is not doing the correct thing. The scale down/up factor updating column stats was wrong as ratio = newRowCount/oldRowCount is always infinite (oldRowCount = 0). The old row count ...
, 2014-08-19, 18:18
[HIVE-7679] JOIN operator should update the column stats when number of rows changes
...JOIN operator does not update the column stats when the number of rows changes. All other operators scales up/down the column statistics when the number of rows changes. Same should be done ...
, 2014-08-12, 18:49
[HIVE-5579] Update statistics rules for different types of joins
...This is a followup of HIVE-5369. Current statistics rules for join operator are generic and are not specific to the type of join. Update the rules based on the type of joins....
, 2014-08-11, 21:32
[HIVE-7231] Improve ORC padding
...Current ORC padding is not optimal because of fixed stripe sizes within block. The padding overhead will be significant in some cases. Also padding percentage relative to stripe size is not ...
, 2014-08-10, 00:26
[HIVE-7490] Revert ORC stripe size
...HIVE-6037 reverted the changes to ORC stripe size introduced by HIVE-7231....
, 2014-08-10, 00:23
[HIVE-7219] Improve performance of serialization utils in ORC
...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/...
, 2014-08-09, 20:41
[HIVE-6578] Use ORC file footer statistics through StatsProvidingRecordReader interface for analyze command
...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...
, 2014-08-07, 09:04
[HIVE-7589] Some fixes and improvements to statistics annotation rules
...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...
, 2014-08-06, 19:33
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