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count(distinct) cleanup

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sasha@mysql.sashanet.com 2001-05-29 18:53:37 -06:00
commit 6ecaac01f0
3 changed files with 13 additions and 6 deletions
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7
sql/item_sum.h
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@ -148,19 +148,20 @@ 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;
uint max_elements_in_tree;
// calculated based on max_heap_table_size. If reached,
// walk the tree and dump it into MyISAM table
uint max_elements_in_tree;
bool use_tree;
// 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;
int rec_offset;
// 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;
int tree_to_myisam();