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From "Jonathan Ellis (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-3064) Add query-by-column mode to
Date Fri, 19 Aug 2011 20:23:29 GMT


Jonathan Ellis commented on CASSANDRA-3064:

The difference introduced by 2498 is, if it knows "I'm looking for exactly {C0,C1,C2,C3,C4,C5},
then once it finds those columns in a sstable, such that the maximum (client) timestamp in
the other sstables is less than the values it found, it doesn't have to look at those others.

But if you give it a range it can't assume that there is no C00, for instance, in an older
sstable that it might need to include.

> Add query-by-column mode to
> ---------------------------------------
>                 Key: CASSANDRA-3064
>                 URL:
>             Project: Cassandra
>          Issue Type: Task
>          Components: Tools
>            Reporter: Jonathan Ellis
>            Assignee: Pavel Yaskevich
>            Priority: Minor
>             Fix For: 1.0
> This is necessary to be able to demonstrate CASSANDRA-2498 as well as any other differences
in slice-based vs name-based queries.

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