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About Worklog
The MySQL Worklog are design specifications for some of the items that may be considered for future development.

WL#1222: We need to unpack packed MyISAM key blocks once per block when reading keys via my_rprev

Affects: Server-7.1   —   Status: Un-Assigned   —   Priority: Medium 

We need to extend mi_rprev to unpack key block once on load.
Currently we call _mi_get_last_key for each key read, and if keys are packed,
_mi_get_last_key is expensive.

Implementing this task will speed up index scan in reverse order by 6-15 times.


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