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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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29
sql/sql_statistics.h
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@ -25,6 +25,14 @@
generated automatically by the table definitions.
*/
typedef
enum enum_use_stat_tables_mode
{
NEVER,
COMPLEMENTARY,
PEFERABLY,
} Use_stat_tables_mode;
enum enum_stat_tables
{
TABLE_STAT,
@ -60,6 +68,27 @@ enum enum_index_stat_col
INDEX_STAT_AVG_FREQUENCY
};
inline
Use_stat_tables_mode get_use_stat_tables_mode(THD *thd)
{
return (Use_stat_tables_mode) (thd->variables.use_stat_tables);
}
int read_statistics_for_tables_if_needed(THD *thd, TABLE_LIST *tables);
int collect_statistics_for_table(THD *thd, TABLE *table);
int alloc_statistics_for_table_share(THD* thd, TABLE_SHARE *share,
bool is_safe);
int alloc_statistics_for_table(THD *thd, TABLE *table);
int update_statistics_for_table(THD *thd, TABLE *table);
int delete_statistics_for_table(THD *thd, LEX_STRING *db, LEX_STRING *tab);
int delete_statistics_for_column(THD *thd, TABLE *tab, Field *col);
int delete_statistics_for_index(THD *thd, TABLE *tab, KEY *key_info,
bool ext_prefixes_only);
int rename_table_in_stat_tables(THD *thd, LEX_STRING *db, LEX_STRING *tab,
LEX_STRING *new_db, LEX_STRING *new_tab);
int rename_column_in_stat_tables(THD *thd, TABLE *tab, Field *col,
const char *new_name);
void set_statistics_for_table(THD *thd, TABLE *table);
class Columns_statistics;
class Index_statistics;