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MDEV-7061: Augment innochecksum to give insight of fragmentation
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Merged facebook/mysql-5.6@615dd07 from https://github.com/facebook/mysql-5.6/
authored by rongrong. Removed C++11 requirement by using
std::map instead of std::unordered_set.

Add analysis to leaf pages to estimate how fragmented an index is
and how much benefit we can get out of defragmentation.
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Jan Lindström committed Mar 4, 2015
1 parent 2e4dc5a commit 143f5d9
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