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Posted to commits@cassandra.apache.org by "Corentin Chary (JIRA)" <ji...@apache.org> on 2017/06/08 14:41:18 UTC
[jira] [Commented] (CASSANDRA-10765) add RangeIterator interface
and QueryPlan for SI
[ https://issues.apache.org/jira/browse/CASSANDRA-10765?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16042791#comment-16042791 ]
Corentin Chary commented on CASSANDRA-10765:
--------------------------------------------
Note: https://github.com/iksaif/cassandra/commit/edbc0a0572b47ef5d5f25d56bd43587eb136170a was an attempt at improving that, which work very well in the cases where multiple indexes are queried and some of them intersect but all of them do not.
> add RangeIterator interface and QueryPlan for SI
> ------------------------------------------------
>
> Key: CASSANDRA-10765
> URL: https://issues.apache.org/jira/browse/CASSANDRA-10765
> Project: Cassandra
> Issue Type: Sub-task
> Components: Local Write-Read Paths
> Reporter: Pavel Yaskevich
> Assignee: Pavel Yaskevich
> Fix For: 4.x
>
>
> Currently built-in indexes have only one way of handling intersections/unions: pick the highest selectivity predicate and filter on other index expressions. This is not always the most efficient approach. Dynamic query planning based on the different index characteristics would be more optimal. Query Plan should be able to choose how to do intersections, unions based on the metadata provided by indexes (returned by RangeIterator) and RangeIterator would became a base for cross index interactions and should have information such as min/max token, estimate number of wrapped tokens etc.
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