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Yuchen Pei b736a23bc3 MDEV-41322 Convert KEY_NOT_FOUND to EOF in "unordered" partition index scans during index_next[_same]/index_prev calls
ha_partition::handle_unordered_scan_next_partition is called in a
variety of accesses, including index_read, index_prev, and index_next.

ha_partition::handle_unordered_next and
ha_partition::handle_unordered_prev are called from index_next and
index_prev accesses. They check for signs of end of
scan (m_part_spec.start_part == NO_CURRENT_PART_ID) and exit early if
that is the case. HA_ERR_END_OF_FILE (EOF) is commonly paired with
assigning NO_CURRENT_PART_ID to m_part_spec.start_part whenever
possible, to signal the end of scan.

The error HA_ERR_KEY_NOT_FOUND means the requested key is not found.
It should not mean the end of scan, when for example
ha_partition::handle_unordered_scan_next_partition is called from
index_read, because a subsequent index_next[_same] / index_prev call
would then incorrectly return immediately from
ha_partition::handle_unordered_next /
ha_partition::handle_unordered_prev. This is why HA_ERR_KEY_NOT_FOUND
is retained and returned in
ha_partition::handle_unordered_scan_next_partition.

But if the call is from index_next[_same] / index_prev,
HA_ERR_KEY_NOT_FOUND should indeed mean end of scan. In this patch, we
ensure this is the case by converting HA_ERR_KEY_NOT_FOUND to EOF in
ha_partition::handle_unordered_next /
ha_partition::handle_unordered_prev.
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