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monty@work.mysql.com 2001-06-21 11:03:54 +02:00
commit 7f68199648
33 changed files with 315 additions and 446 deletions
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15
sql/item_sum.h
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@ -148,20 +148,21 @@ class Item_sum_count_distinct :public Item_sum_int
bool fix_fields(THD *thd,TABLE_LIST *tables);
TMP_TABLE_PARAM *tmp_table_param;
TREE tree;
// calculated based on max_heap_table_size. If reached,
// walk the tree and dump it into MyISAM table
uint max_elements_in_tree;
// the first few bytes of record ( at least one)
// are just markers for deleted and NULLs. We want to skip them since
// they will just bloat the tree without providing any valuable info
int rec_offset;
// If there are no blobs, we can use a tree, which
// is faster than heap table. In that case, we still use the table
// to help get things set up, but we insert nothing in it
bool use_tree;
// the first few bytes of record ( at least one)
// are just markers for deleted and NULLs. We want to skip them since
// they will just bloat the tree without providing any valuable info
int rec_offset;
bool always_null; // Set to 1 if the result is always NULL
int tree_to_myisam();
@ -172,7 +173,7 @@ class Item_sum_count_distinct :public Item_sum_int
public:
Item_sum_count_distinct(List<Item> &list)
:Item_sum_int(list),table(0),used_table_cache(~(table_map) 0),
tmp_table_param(0),use_tree(0)
tmp_table_param(0),always_null(0),use_tree(0)
{ quick_group=0; }
~Item_sum_count_distinct();
table_map used_tables() const { return used_table_cache; }