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From "Vijay (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-3885) Support multiple ranges in SliceQueryFilter
Date Mon, 04 Jun 2012 22:21:23 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-3885?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13288960#comment-13288960
] 

Vijay commented on CASSANDRA-3885:
----------------------------------

Hi David,

{quote}
 Cacheing the results is not about query validation, at least I can't see how better query
validation would discard the necessity of cacheing to avoid re-reads.
{quote}
We can validate and also rewrite the query, Example: user wants a query from {A:B-A:D, A:D-A:H,
A:D-A:G} can be rewritten as {A:B-A:H}... End of the day the user needs a list of sorted columns.

In addition with the new patch: ColumnSlice can be a Pair<T1,T2>, (but I thought we
also need count and isReverse in it?)

                
> 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
>
>
> 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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