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Addressed all remaining issues from the review of the patch

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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.
This commit is contained in:
Igor Babaev
2012-12-13 23:05:12 -08:00
parent 65820439bd
commit a06224bd15
16 changed files with 112 additions and 45 deletions
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sql/sql_join_cache.cc
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@ -3812,7 +3812,8 @@ uint JOIN_TAB_SCAN_MRR::aux_buffer_incr(ulong recno)
uint incr= 0;
TABLE_REF *ref= &join_tab->ref;
TABLE *tab= join_tab->table;
uint rec_per_key= tab->key_info[ref->key].real_rec_per_key(ref->key_parts-1);
uint rec_per_key=
tab->key_info[ref->key].actual_rec_per_key(ref->key_parts-1);
set_if_bigger(rec_per_key, 1);
if (recno == 1)
incr= ref->key_length + tab->file->ref_length;