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Posted to dev@lens.apache.org by "Amareshwari Sriramadasu (JIRA)" <ji...@apache.org> on 2015/03/17 09:04:38 UTC

[jira] [Work started] (LENS-404) Queries on JoinChains should not involve metastore lookup

     [ https://issues.apache.org/jira/browse/LENS-404?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on LENS-404 started by Amareshwari Sriramadasu.
----------------------------------------------------
> Queries on JoinChains should not involve metastore lookup
> ---------------------------------------------------------
>
>                 Key: LENS-404
>                 URL: https://issues.apache.org/jira/browse/LENS-404
>             Project: Apache Lens
>          Issue Type: Improvement
>          Components: cube
>            Reporter: Amareshwari Sriramadasu
>            Assignee: Amareshwari Sriramadasu
>             Fix For: 2.1
>
>
> JoinChains are not tables. 
> CubeQueryContext.extractMetaTables queries metastore for all table aliases accessed in the query. For actual tables, the tables will be cached in cube metastore client. For tables that are not there, it will still do a getTable call.
> We should optimize joinchain lookup on the client, not to lookup metastore



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