holyfoot/hf@mysql.com/hfmain.(none)
a2f08506e1
Bug #31890 Partitions: ORDER BY DESC in InnoDB not working. ...
It's not InnoDB specific bug.
Error is in QUEUE code, about the way we handle queue->max_at_top.
It's either '0' or '-2' and we do '^' operation to get the proper
direction. Though queue->compare() function can return '-2' as
a result of comparison sometimes. So we'll get
queue->compare() ^ queue->max_at_top == 0 (when max_at_top is -2)
and _downheap() function code will go wrong way here:
...
if (next_index < elements &&
(queue->compare(queue->first_cmp_arg,
queue->root[next_index]+offset_to_key,
queue->root[next_index+1]+offset_to_key) ^
queue->max_at_top) > 0)
next_index++;
...
Fixed by changing max_at_top to be either 1 or -1, doing
'* max_at_top' to get proper direction.
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