Aleksey Yeschenko commented on CASSANDRA-14910:

Force-pushed an updated version that just avoids making any decisions regarding 
skipping sstables based on static slice bounds - start or end. Can't rely on 
them, can't trust them, they are as dodgy as our recording of min/max cell 
names if static rows are involved.

> 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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