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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 Fri, 02 Feb 2018 20:18:01 GMT

    [ https://issues.apache.org/jira/browse/PHOENIX-3941?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16350902#comment-16350902
] 

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

[~maryannxue] - would you mind taking a look at this v2 patch? I'm trying to keep the data
plan with the query plan used for an index (so we can potentially prune local index regions
when there are leading PK columns in common between the data table and index table). For joins,
I'm losing the QueryCompiler.dataPlan along the way and I'm not sure how to fix it.

> 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
>
>
> 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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