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Evgeny Potemkin 151af144ff Bug #55656: mysqldump can be slower after bug 39653 fix.
After fix for bug 39653 the shortest available secondary index was used for
full table scan. Primary clustered key was used only if no secondary index
can be used. However, when chosen secondary index includes all fields of the
table being scanned it's better to use primary index since the amount of
data to scan is the same but the primary index is clustered.
Now the find_shortest_key function takes this into account.
2010-08-26 13:31:04 +04:00
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