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From "Sylvain Lebresne (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-4536) Ability for CQL3 to list partition keys
Date Wed, 21 Aug 2013 15:20:52 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-4536?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13746123#comment-13746123
] 

Sylvain Lebresne commented on CASSANDRA-4536:
---------------------------------------------

lgtm, +1


(I've created CASSANDRA-5912 as a follow up if we want to get fancy and optimize that further.
Probably not a priority though).
                
> Ability for CQL3 to list partition keys
> ---------------------------------------
>
>                 Key: CASSANDRA-4536
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4536
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: API
>    Affects Versions: 1.1.0
>            Reporter: Jonathan Ellis
>            Assignee: Aleksey Yeschenko
>            Priority: Minor
>              Labels: cql3
>             Fix For: 2.0.1
>
>         Attachments: 4536.txt, cassandra-4536_1.1.0.patch, cassandra-4536_1.2.2.patch,
cassandra-4536_1.2.5.patch
>
>
> It can be useful to know the set of in-use partition keys (storage engine row keys).
 One example given to me was where application data was modeled as a few 10s of 1000s of wide
rows, where the app required presenting these rows to the user sorted based on information
in the partition key.  The partition count is small enough to do the sort client-side in memory,
which is what the app did with the Thrift API--a range slice with an empty columns list.
> This was a problem when migrating to CQL3.  {{SELECT mykey FROM mytable}} includes all
the logical rows, which makes the resultset too large to make this a reasonable approach,
even with paging.
> One way to add support would be to allow DISTINCT in the special case of {{SELECT DISTINCT
mykey FROM mytable}}.

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