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From "Sylvain Lebresne (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-3885) Support multiple ranges in SliceQueryFilter
Date Mon, 11 Jun 2012 08:05:44 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-3885?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13292683#comment-13292683
] 

Sylvain Lebresne commented on CASSANDRA-3885:
---------------------------------------------

bq. Why don't we make the "count" information reach ISR so that we can stop at the precise
point the user query specifies?

Because it's more complex than that. The final result is based on merging (potentially) multiple
sstables, so the Nth column in a given sstable is not necessarily the Nth returned column.

                
> Support multiple ranges in SliceQueryFilter
> -------------------------------------------
>
>                 Key: CASSANDRA-3885
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3885
>             Project: Cassandra
>          Issue Type: Sub-task
>          Components: Core
>            Reporter: Jonathan Ellis
>            Assignee: David Alves
>             Fix For: 1.2
>
>         Attachments: CASSANDRA-3885.patch, CASSANDRA-3885.patch, CASSANDRA-3885.patch,
CASSANDRA-3885.patch, CASSANDRA-3885.patch
>
>
> This is logically a subtask of CASSANDRA-2710, but Jira doesn't allow sub-sub-tasks.
> We need to support multiple ranges in a SliceQueryFilter, and we want querying them to
be efficient, i.e., one pass through the row to get all of the ranges, rather than one pass
per range.
> Supercolumns are irrelevant since the goal is to replace them anyway.  Ignore supercolumn-related
code or rip it out, whichever is easier.
> This is ONLY dealing with the storage engine part, not the StorageProxy and Command intra-node
messages or the Thrift or CQL client APIs.  Thus, a unit test should be added to ColumnFamilyStoreTest
to demonstrate that it works.

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