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https://issues.apache.org/jira/browse/CASSANDRA-3885?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Alves updated CASSANDRA-3885:
-----------------------------------
Attachment: CASSANDRA-3885.patch
Here's a patch that addresses most of the issues:
- A slice range is now specified as a ColumnSlice, a db package immutable
object.
- Ranges are passed as arrays and never changed or copied.
The only thing that was not addressed was the cache issue. IMO cache is useful
as it prevents disk rereads. It *might* be better to make sure columns are
needed, but even that I'm really not sure since making sure would require a
series of bytebuffer comparisons, and keeping a single index-lenght (max) of
cols is probably not that bad.
> 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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