Previously _current_bucket_segment_index was used differently depending on
whether update_position_trackers() is used in a random or sequential
access. In the former case was used as the absolute index of the segment
(independent of the buckets) and in the latter as the relative index of
the segment within its bucket. This caused problems when there was a
switch between random and sequential access, meaning one could get different
results for an at() call depending on what was the previous at() call.
Fix this by consistently using _current_bucket_segment_index as - like its
name suggest - the bucket relative segment index.
Ref #1946.
Signed-off-by: Botond Dénes <bdenes@scylladb.com>
Message-Id: <7f68ac1d32c80e8dea6dfa11be02acaa961bce2a.1503924927.git.bdenes@scylladb.com>
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