[DocDB] Test middle key determination with one user data block and multiple index levels #29620
Description
Jira Link: DB-19436
Description
Currently Incomplete status is handled in BlockBasedTable::GetMiddleKey() by seeking to the sole data block in the SST and finding the middle key in it. This logic was implemented as a fallback for the traditional top-level based middle key algorithm. We reuse this fallback logic in the enhanced multi-level middle key algorithm that uses a lower bound. Verify that or add unit tests that exercise this code path.
Issue Type
kind/enhancement
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