[v22.3.x] cloud_storage: fix empty segment check in reader #10869
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This was incorrectly offsetting the next kafka offset by 1. A segment with kafka data in it has a next offset != its base offset, while a segment _without_ kafka data has a next offset == its base offset. This was ignored by unit tests because the tests were using segment name format v1 which ignores delta_offset_end, and ignored by integration tests because if our reader path drops out then the client will retry, and because it only causes the problem if a segment has exactly one data batch in it. (cherry picked from commit 92cbc1a)
andrwng
approved these changes
May 18, 2023
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Backport of PR #10782
Fixes #10845