[jira] [Commented] (PHOENIX-3941) Filter regions to scan for local indexes based on data table leading pk filter conditions

["James Taylor (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PHOENIX-3941?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16049784#comment-16049784 ] 

James Taylor commented on PHOENIX-3941:
---------------------------------------

FYI, [~lhofhansl] & [~rajeshbabu] - I think this will ofthen help prevent large numbers of RPCs over big tables that use local indexes.

> Filter regions to scan for local indexes based on data table leading pk filter conditions
> -----------------------------------------------------------------------------------------
>
>                 Key: PHOENIX-3941
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-3941
>             Project: Phoenix
>          Issue Type: Bug
>            Reporter: James Taylor
>              Labels: SFDC, localIndex
>             Fix For: 4.12.0
>
>
> Had a good offline conversation with [~ndimiduk] at PhoenixCon about local indexes. Depending on the query, we can often times prune the regions we need to scan over based on the where conditions against the data table pk. For example, with a multi-tenant table, we only need to scan the regions that are prefixed by the tenant ID.
> We can easily get this information from the compilation of the query against the data table (which we always do), through the statementContext.getScanRanges() structure. We'd just want to keep a pointer to the data table QueryPlan from the local index QueryPlan.



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