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From "Alex Petrov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-11031) MultiTenant : support “ALLOW FILTERING" for Partition Key
Date Fri, 15 Jul 2016 09:08:20 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-11031?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15379062#comment-15379062
] 

Alex Petrov commented on CASSANDRA-11031:
-----------------------------------------

I'd say we have to support everything that filtering on regular and clustering columns supports.
I've updated the comment above to provide more possible use-cases.

> MultiTenant : support “ALLOW FILTERING" for Partition Key
> ---------------------------------------------------------
>
>                 Key: CASSANDRA-11031
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-11031
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: CQL
>            Reporter: ZhaoYang
>            Assignee: ZhaoYang
>            Priority: Minor
>             Fix For: 3.x
>
>         Attachments: CASSANDRA-11031-3.7.patch
>
>
> Currently, Allow Filtering only works for secondary Index column or clustering columns.
And it's slow, because Cassandra will read all data from SSTABLE from hard-disk to memory
to filter.
> But we can support allow filtering on Partition Key, as far as I know, Partition Key
is in memory, so we can easily filter them, and then read required data from SSTable.
> This will similar to "Select * from table" which scan through entire cluster.
> CREATE TABLE multi_tenant_table (
> 	tenant_id text,
> 	pk2 text,
> 	c1 text,
> 	c2 text,
> 	v1 text,
> 	v2 text,
> 	PRIMARY KEY ((tenant_id,pk2),c1,c2)
> ) ;
> Select * from multi_tenant_table where tenant_id = "datastax" allow filtering;



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