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[HIVE-7655] CBO: Reading of partitioned table stats slows down explain - Hive - [issue]
...This defect is due to a regression introduced in https://issues.apache.org/jira/browse/HIVE-7625, explain for queries that touch partitioned tables is 10x slower.RelOptHiveTable.getRowCount ...
http://issues.apache.org/jira/browse/HIVE-7655    Author: Mostafa Mokhtar, 2014-09-06, 22:23
[HIVE-7992] StatsRulesProcFactory should gracefully handle overflows - Hive - [issue]
...When StatsRulesProcFactory overflows it sets data size to 0 and as a result the Vertex will ask for a single task, this results in a fairly slow running query, most likely the overflow is a ...
http://issues.apache.org/jira/browse/HIVE-7992    Author: Mostafa Mokhtar, 2014-09-06, 21:57
[HIVE-7991] Incorrect calculation of number of rows in JoinStatsRule.process results in overflow - Hive - [issue]
...This loop results in adding the parent twice incase of a 3 way join of store_sales  x date_dim x store         for (int pos = 0; pos < parents.size(); pos++)...
http://issues.apache.org/jira/browse/HIVE-7991    Author: Mostafa Mokhtar, 2014-09-06, 10:46
[HIVE-7990] With fetch column stats disabled number of elements in grouping set is not taken into account - Hive - [issue]
...For queries with rollup and cube the number of rows calculation in GroupByStatsRule should be multiplied by number of elements in grouping set.A side effect of this defect is that reducers w...
http://issues.apache.org/jira/browse/HIVE-7990    Author: Mostafa Mokhtar, 2014-09-06, 06:04
[HIVE-7741] Don't synchronize WriterImpl.addRow() when dynamic.partition is enabled - Hive - [issue]
...When loading into an un-paritioned ORC table WriterImpl$StructTreeWriter.write method is synchronized.When hive.optimize.sort.dynamic.partition is enabled the current thread will be the only...
http://issues.apache.org/jira/browse/HIVE-7741    Author: Mostafa Mokhtar, 2014-09-05, 19:13
Re: Review Request 25395: HIVE-7990: With fetch column stats disabled number of elements in grouping set is not taken into account - Hive - [mail # dev]
...This is an automatically generated e-mail. To reply, visit:https://reviews.apache.org/r/25395/#review52492ql/src/java/org/apache/hadoop/hive/ql/optimizer/stats/annotation/StatsRulesProcFacto...
   Author: Mostafa Mokhtar, 2014-09-05, 19:10
[HIVE-7913] Simplify filter predicates for CBO - Hive - [issue]
...Simplify predicates for disjunctive predicates so that can get pushed down to the scan.For TPC-DS query 13 we push down predicates in the following form where c_martial_status in ('M','D','U...
http://issues.apache.org/jira/browse/HIVE-7913    Author: Mostafa Mokhtar, 2014-09-05, 02:56
[HIVE-7993] With CBO enabled Q75 fails with RuntimeException: cannot find field _col69 from [0:_col18,...] - Hive - [issue]
...Exception 2014-09-04 19:28:24,032 INFO [TezChild] org.apache.hadoop.hive.ql.exec.JoinOperator: 41 Close done2014-09-04 19:28:24,033 ERROR [TezChild] org.apache.hadoop.hive.ql.exec.tez.TezPro...
http://issues.apache.org/jira/browse/HIVE-7993    Author: Mostafa Mokhtar, 2014-09-05, 02:56
[HIVE-7982] Regression in explain with CBO enabled due to issuing query per K,V for the stats - Hive - [issue]
...Now explain for Q17 is back in the 12 second range, I checked the queries issues to MySQL and they are very different than before on August 15 explain was completing in under 5 seconds and w...
http://issues.apache.org/jira/browse/HIVE-7982    Author: Mostafa Mokhtar, 2014-09-04, 23:05
[HIVE-7834] Use min, max and NDV from the stats to better estimate many to many vs one to many inner joins - Hive - [issue]
...I noticed that the estimate number of rows in Map joins is higher after the join than before the join that is with column stats fetch ON or OFF.TPC-DS Q55 was a good example for that, the is...
http://issues.apache.org/jira/browse/HIVE-7834    Author: Mostafa Mokhtar, 2014-09-04, 20:51
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