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[HIVE-7985] With CBO enabled cross product is generated when a subquery is present - Hive - [issue]
...This is a regression introduced in the latest build of the CBO branch.Removing the subquery for item will remove the cross productsQueryselect i_item_id,sum(ss_ext_sales_price) total_sales f...
http://issues.apache.org/jira/browse/HIVE-7985    Author: Mostafa Mokhtar, 2014-10-23, 03:23
[HIVE-8454] Select Operator does not rename column stats properly in case of select star - Hive - [issue]
...The estimated data size of some Select Operators is 0. BytesBytesHashMap uses data size to determine the estimated initial number of entries in the hashmap. If this data size is 0 then excep...
http://issues.apache.org/jira/browse/HIVE-8454    Author: Mostafa Mokhtar, 2014-10-23, 02:03
[HIVE-8235] Insert into partitioned bucketed sorted tables fails with "this file is already being created by" - Hive - [issue]
...When loading into a partitioned bucketed sorted table the query fails with Caused by: org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.hdfs.protocol.AlreadyBeingCreatedException): Fai...
http://issues.apache.org/jira/browse/HIVE-8235    Author: Mostafa Mokhtar, 2014-10-23, 00:11
[HIVE-8495] Add progress bar for Hive on Tez queries - Hive - [issue]
...Build a "Progress bar" to provide overall progress on running tasks.Progress is calculated as :  (Completed tasks) / (Total number of tasks)...
http://issues.apache.org/jira/browse/HIVE-8495    Author: Mostafa Mokhtar, 2014-10-22, 19:50
[HIVE-8517] When joining on partition column NDV gets overridden by StatsUtils.getColStatisticsFromExpression - Hive - [issue]
...When joining on partition column number of partitions is used as NDV which gets overridden by StatsUtils.getColStatisticsFromExpression and the number of partitions used as NDV is replaced b...
http://issues.apache.org/jira/browse/HIVE-8517    Author: Mostafa Mokhtar, 2014-10-21, 23:21
[HIVE-8168] With dynamic partition enabled fact table selectivity is not taken into account when generating the physical plan (Use CBO cardinality using physical plan generation) - Hive - [issue]
...When calculating estimate row counts & data size during physical plan generation in StatsRulesProcFactory doesn't know that there will be dynamic partition pruning and it is hard to know...
http://issues.apache.org/jira/browse/HIVE-8168    Author: Mostafa Mokhtar, 2014-10-21, 22:13
[HIVE-8196] Joining on partition columns with fetch column stats enabled results it very small CE which negatively affects query performance - Hive - [issue]
...To make the best out of dynamic partition pruning joins should be on the partitioning columns which results in dynamically pruning the partitions from the fact table based on the qualifying ...
http://issues.apache.org/jira/browse/HIVE-8196    Author: Mostafa Mokhtar, 2014-10-19, 19:35
[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
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