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https://issues.apache.org/jira/browse/CASSANDRA-14910?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16700215#comment-16700215
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Alex Petrov edited comment on CASSANDRA-14910 at 11/27/18 11:10 AM:
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The new version looks much better, the only thing is that current tests do not
cover
[this|https://github.com/apache/cassandra/compare/trunk...iamaleksey:14910-2.2#diff-82e58a7c5bec8818f2e88a982725690fR113]
part (e.g. {{compare}} is now not called on static bounds since we're
returning {{true}} before calling {{intersect}} which would invoke comparator),
so while I'm not saying that the change is wrong, I'm not 100% sure if we
should keep it unless we have a test or at least an example scenario where this
one is required. Can you comment on where we need it?
UPDATE: I've ran some more tests and so far could only land into {{comparison
!= null}} clause but couldn't do it with static bounds.
was (Author: ifesdjeen):
The new version looks much better, the only thing is that current tests do not
cover
[this|https://github.com/apache/cassandra/compare/trunk...iamaleksey:14910-2.2#diff-82e58a7c5bec8818f2e88a982725690fR113]
part (e.g. {{compare}} is now not called on static bounds since we're
returning {{true}} before calling {{intersect}} which would invoke comparator),
so while I'm not saying that the change is wrong, I'm not 100% sure if we
should keep it unless we have a test or at least an example scenario where this
one is required. Can you comment on where we need it?
> Don't skip entire sstables when reading backwards with mixed clustering
> column order
> ------------------------------------------------------------------------------------
>
> Key: CASSANDRA-14910
> URL: https://issues.apache.org/jira/browse/CASSANDRA-14910
> Project: Cassandra
> Issue Type: Bug
> Components: Local Write-Read Paths
> Reporter: Aleksey Yeschenko
> Assignee: Aleksey Yeschenko
> Priority: Major
> Fix For: 2.2.x
>
>
> In 2.x, if a table has clustering columns in {{DESC}} order, any SSTable that
> doesn’t have any static rows in it will be skipped altogether when iterated
> in reverse.
> This occurs due to the logic in {{ColumnSlice.compare()}} errorneusly sorting
> any empty {{ByteBuffer}} after non-empty values due to the way
> {{ReversedType}} operates. In case that empty {{ByteBuffer}} is coming from a
> static {{Composite}}, however, the logic breaks down. Static {{Composite}}
> components must *always* sort before any non-empty value, no matter the
> table’s comparator.
> 2.0, 2.1, and 2.2 are all affected. 3.0 isn’t, but only because we skip slice
> intersection logic entirely if static rows are present in the filter.
> Introduced by CASSANDRA-8502.
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