Igor Babaev a06224bd15 Addressed all remaining issues from the review of the patch ...

that introduced engine independent persistent statistics.
In particular:
- added an enumeration type for possible values of the system
  variable use_stat_tables
- renamed KEY::real_rec_per_key to KEY::actual_rec_per_key
- optimized the collection of statistical data for any primary
  key defined only on one column.

2012-12-13 23:05:12 -08:00

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