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https://issues.apache.org/jira/browse/CASSANDRA-3885?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13289209#comment-13289209
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Sylvain Lebresne commented on CASSANDRA-3885:
---------------------------------------------
bq. Now while the the current range we're looking for only needs "e" and "f" we
have also deserialized "d"
That's what looks wrong to me (without having read the patch, I'll admit). It
seems that as soon as we deserialize "d", we should realize that we're outside
of [f-e] and thus we should start considering [d-b] and as such add the column
to the result without a need for caching. Provided the requested range don't
overlap (which I agree could be assumed by the sstable reader and validated way
upfront), we shouldn't need to deserialize anything twice and we shouldn't need
any cache.
> 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
>
>
> 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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