Kamil Braun 3687757115
sstables: fix TWCS single key reader sstable filter ...
The filter passed to `min_position_reader_queue`, which was used by
`clustering_order_reader_merger`, would incorrectly include sstables as
soon as they passed through the PK (bloom) filter, and would include
sstables which didn't pass the PK filter (if they passed the CK
filter). Fortunately this wouldn't cause incorrect data to be returned,
but it would cause sstables to be opened unnecessarily (these sstables
would immediately return eof), resulting in a performance drop. This commit
fixes the filter and adds a regression test which uses statistics to
check how many times the CK filter was invoked.
Fixes #8432 .
Closes #8433
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3687757115