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Merge

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This commit is contained in:
Igor Babaev
2010-12-09 21:55:14 -08:00
parent f960f2334d 3e946fa7ad
commit c4080280df
33 changed files with 4032 additions and 488 deletions
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15
sql/mysql_priv.h
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@ -338,7 +338,7 @@ protected:
Number of comparisons of table rowids equivalent to reading one row from a
table.
*/
#define TIME_FOR_COMPARE_ROWID (TIME_FOR_COMPARE*2)
#define TIME_FOR_COMPARE_ROWID (TIME_FOR_COMPARE*100)
/*
For sequential disk seeks the cost formula is:
@ -542,12 +542,13 @@ protected:
#define OPTIMIZER_SWITCH_INDEX_MERGE_UNION 2
#define OPTIMIZER_SWITCH_INDEX_MERGE_SORT_UNION 4
#define OPTIMIZER_SWITCH_INDEX_MERGE_INTERSECT 8
#define OPTIMIZER_SWITCH_INDEX_MERGE_SORT_INTERSECT 16
#ifdef DBUG_OFF
# define OPTIMIZER_SWITCH_LAST 16
#else
# define OPTIMIZER_SWITCH_TABLE_ELIMINATION 16
# define OPTIMIZER_SWITCH_LAST 32
#else
# define OPTIMIZER_SWITCH_TABLE_ELIMINATION 32
# define OPTIMIZER_SWITCH_LAST 64
#endif
#ifdef DBUG_OFF
@ -555,12 +556,14 @@ protected:
# define OPTIMIZER_SWITCH_DEFAULT (OPTIMIZER_SWITCH_INDEX_MERGE | \
OPTIMIZER_SWITCH_INDEX_MERGE_UNION | \
OPTIMIZER_SWITCH_INDEX_MERGE_SORT_UNION | \
OPTIMIZER_SWITCH_INDEX_MERGE_INTERSECT)
OPTIMIZER_SWITCH_INDEX_MERGE_INTERSECT | \
OPTIMIZER_SWITCH_INDEX_MERGE_SORT_INTERSECT)
#else
# define OPTIMIZER_SWITCH_DEFAULT (OPTIMIZER_SWITCH_INDEX_MERGE | \
OPTIMIZER_SWITCH_INDEX_MERGE_UNION | \
OPTIMIZER_SWITCH_INDEX_MERGE_SORT_UNION | \
OPTIMIZER_SWITCH_INDEX_MERGE_INTERSECT | \
OPTIMIZER_SWITCH_INDEX_MERGE_SORT_INTERSECT | \
OPTIMIZER_SWITCH_TABLE_ELIMINATION)
#endif
@ -2233,6 +2236,8 @@ ha_rows filesort(THD *thd, TABLE *form,struct st_sort_field *sortorder,
ha_rows max_rows, bool sort_positions,
ha_rows *examined_rows);
void filesort_free_buffers(TABLE *table, bool full);
double get_merge_many_buffs_cost(uint *buffer, uint last_n_elems,
int elem_size);
void change_double_for_sort(double nr,uchar *to);
double my_double_round(double value, longlong dec, bool dec_unsigned,
bool truncate);