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From "James Taylor (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PHOENIX-3941) Filter regions to scan for local indexes based on data table leading pk filter conditions
Date Tue, 06 Feb 2018 18:26:00 GMT

    [ https://issues.apache.org/jira/browse/PHOENIX-3941?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16354295#comment-16354295
] 

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

[~tdsilva] - would you have some spare cycles to review? The only case we're not handling
is when a join uses a local index. That follow up work will be done in PHOENIX-4585.

> 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
>            Assignee: James Taylor
>            Priority: Major
>              Labels: SFDC, localIndex
>             Fix For: 4.14.0
>
>         Attachments: PHOENIX-3941_v1.patch, PHOENIX-3941_v2.patch, PHOENIX-3941_v3.patch
>
>
> 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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