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72003dc35c
The evictable reader must ensure that each buffer fill makes forward progress, i.e. the last fragment in the buffer has a position larger than the last fragment from the last buffer-fill. Otherwise, the reader could get stuck in an infinite loop between buffer fills, if the reader is evicted in-between. The code guranteeing this forward change has a bug: when the next expected position is a partition-start (another partition), the code would loop forever, effectively reading all there is from the underlying reader. To avoid this, add a special case to ignore the progress guarantee loop altogether when the next expected position is a partition start. In this case, progress is garanteed anyway, because there is exactly one partition-start fragment in each partition. Fixes: #13491 Closes #13563