Sergey Petrunya 07a52afd00 MDEV-4410: update does not want to use a covering index, but select uses it ...

- If an UPDATE 1) modifies the key it is using, and 2) has ORDER BY ... LIMIT
  which matches the key it is using,  Then we should use "Using buffer", not
  "Using filesort".

2014-03-16 14:33:37 +01:00

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