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a717c803c7
Adds a reproducer for #12462, which doesn't manifest in master any
more after f73e2c992f. It's still useful
to keep the test to avoid regresions.
The bug manifests by reader throwing:
std::logic_error: Stream ends with an active range tombstone: {range_tombstone_change: pos={position: clustered,ckp{},-1}, {tombstone: timestamp=-9223372036854775805, deletion_time=2}}
The reason is that prior to the rework of the cache reader,
range_tombstone_generator::flush() was used with end_of_range=true to
produce the closing range_tombstone_change and it did not handle
correctly the case when there are two adjacent range tombstones and
flush(pos, end_of_range=true) is called such that pos is the boundary
between the two.
Closes #13665