[jira] [Work stopped] (TRAFODION-23) Keyed nested join in TPCH query 2 and 15 disappeared recently

["Qifan Chen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TRAFODION-23?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on TRAFODION-23 stopped by Qifan Chen.
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> Keyed nested join in TPCH query 2 and 15 disappeared recently
> -------------------------------------------------------------
>
>                 Key: TRAFODION-23
>                 URL: https://issues.apache.org/jira/browse/TRAFODION-23
>             Project: Apache Trafodion
>          Issue Type: Bug
>            Reporter: Qifan Chen
>            Assignee: Qifan Chen
>              Labels: performance
>
> Good keyed nested join in TPCH query 2 and 15 disappeared in recent performance test (close to the ones dated 06222015). Each is replaced by a hash join which is more expensive to evaluate. 
> To fix this case, we can take the following approach. 
> 1. Modify the earlier versions of Trafodion so that they compile without log4cpp;
> 2. Install the versions on a cluster and run the two queries
> 3. Identity the earliest version of Trafodion in which the NJ->HJ takes place
> 4. Analyze the code change to isolate the root cause



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