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This is first cset for WL#1394 "Optimize index merge when all involved index ranges include only values with equal keys"

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The main idea is to exploit the fact that key scans for "key=const" return ordered sequences of rowids.
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sergefp@mysql.com
2004-05-13 01:38:40 +04:00
parent b2efad935b
commit a46d7542c9
28 changed files with 3720 additions and 500 deletions
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sql/sql_select.h
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@ -329,7 +329,7 @@ uint find_shortest_key(TABLE *table, const key_map *usable_keys);
int opt_sum_query(TABLE_LIST *tables, List<Item> &all_fields,COND *conds);
/* from sql_delete.cc, used by opt_range.cc */
extern "C" int refposcmp2(void* arg, const void *a,const void *b);
extern "C" int refpos_order_cmp(void* arg, const void *a,const void *b);
/* class to copying an field/item to a key struct */