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[HIVE-7723] Explain plan for complex query with lots of partitions is slow due to in-efficient collection used to find a matching ReadEntity - Hive - [issue]
...Explain on TPC-DS query 64 took 11 seconds, when the CLI was profiled it showed that ReadEntity.equals is taking ~40% of the CPU.ReadEntity.equals is called from the snippet below.Again and ...
http://issues.apache.org/jira/browse/HIVE-7723    Author: Mostafa Mokhtar, 2015-10-31, 05:53
[HIVE-8765] TPC-DS Q21 : Incorrect join order makes query run slower (Not scaling selectivity by NDV) - Hive - [issue]
...CBO joins with date_dim first instead of item where item is the more selective join.Query select  * from(select w_warehouse_name            ,i_item_id...
http://issues.apache.org/jira/browse/HIVE-8765    Author: Mostafa Mokhtar, 2015-10-09, 02:22
[HIVE-9695] Redundant filter operator in reducer Vertex when CBO is disabled - Hive - [issue]
...There is a redundant filter operator in reducer Vertex when CBO is disabled.Query select         ss_item_sk, ss_ticket_number, ss_store_sk    from    ...
http://issues.apache.org/jira/browse/HIVE-9695    Author: Mostafa Mokhtar, 2015-10-08, 12:35
[HIVE-10651] ORC file footer cache should be bounded - Hive - [issue]
...ORC's file footer cache is currently unbounded and is a soft reference cache. The cache size got from config is used to set initial capacity. We should bound the cache from growing too big a...
http://issues.apache.org/jira/browse/HIVE-10651    Author: Mostafa Mokhtar, 2015-09-16, 07:59
[HIVE-11341] Avoid expensive resizing of ASTNode tree - Hive - [issue]
...Stack Trace Sample Count Percentage(%) parse.BaseSemanticAnalyzer.analyze(ASTNode, Context) 1,605 90    parse.CalcitePlanner.analyzeInternal(ASTNode) 1,605 90    ...
http://issues.apache.org/jira/browse/HIVE-11341    Author: Mostafa Mokhtar, 2015-08-30, 01:58
[HIVE-10568] Select count(distinct()) can have more optimal execution plan - Hive - [issue]
...select count(distinct ss_ticket_number) from store_sales;can be rewritten asselect count(1) from (select distinct ss_ticket_number from store_sales) a;which may run upto 3x faster...
http://issues.apache.org/jira/browse/HIVE-10568    Author: Mostafa Mokhtar, 2015-08-28, 01:44
[HIVE-11299] Hive query planning allocating lots of memory and hitting OOMs - Hive - [issue]
...Plan generation for queries with lots of disjunct filters spends lots of time compiling....
http://issues.apache.org/jira/browse/HIVE-11299    Author: Mostafa Mokhtar, 2015-08-24, 06:32
[HIVE-10793] Hybrid Hybrid Grace Hash Join : Don't allocate all hash table memory upfront - Hive - [issue]
...HybridHashTableContainer will allocate memory based on estimate, which means if the actual is less than the estimate the allocated memory won't be used.Number of partitions is calculated bas...
http://issues.apache.org/jira/browse/HIVE-10793    Author: Mostafa Mokhtar, 2015-08-20, 19:22
[HIVE-9069] Simplify filter predicates for CBO - Hive - [issue]
...Simplify predicates for disjunctive predicates so that can get pushed down to the scan.Looks like this is still an issue, some of the filters can be pushed down to the scan.set hive.cbo.enab...
http://issues.apache.org/jira/browse/HIVE-9069    Author: Mostafa Mokhtar, 2015-08-10, 11:41
[HIVE-11460] CTAS : Allows user to create table without explicit column names which fails stats creation on new table - Hive - [issue]
...create table customer_reload stored as orc as select c.c_custkey, c.c_name, c.c_acctbal, cast (c.c_custkey as bigint) from customer c;Create table schema # col_name     &nbs...
http://issues.apache.org/jira/browse/HIVE-11460    Author: Mostafa Mokhtar, 2015-08-04, 23:29
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elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB