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* Undo of range optimizer fix from previous changeset

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* Fixed test results.


mysql-test/r/index_merge_ror.result:
  Typo fix
mysql-test/r/rowid_order_bdb.result:
  new index_merge EXPLAIN output format changes
mysql-test/r/rowid_order_innodb.result:
  new index_merge EXPLAIN output format changes
sql/opt_range.cc:
  Undo of previous fix:
  If cost(full_scan_on_covering_index) < cost(best_range_scan) <  cost(full_table_scan) 
  use full_scan_on_covering_index, not best_range_scan.
  The fix affects read plan choice for more queries then initially anticipated, so I'm reverting it for now, will get back to this later
This commit is contained in:
unknown 2004-05-29 17:50:05 +04:00
parent 1ce1880204
commit 2164db3c8c
4 changed files with 16 additions and 13 deletions
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1
mysql-test/r/index_merge_ror.result
View File

@ -193,3 +193,4 @@ insert into t2 values ('ab', 'ab', 'uh', 'oh');
explain select a from t2 where a='ab';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ref a a 6 const 1 Using where
drop table t2;

2
mysql-test/r/rowid_order_bdb.result
View File

@ -14,7 +14,7 @@ insert into t1 values (-5, 1, 1),
(10, 1, 1);
explain select * from t1 force index(key1, key2) where key1 < 3 or key2 < 3;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index_merge key1,key2 key1,key2 5,5 NULL 5 Using where
1 SIMPLE t1 index_merge key1,key2 key1,key2 5,5 NULL 5 Using sort_union(key1,key2); Using where
select * from t1 force index(key1, key2) where key1 < 3 or key2 < 3;
pk1 key1 key2
-100 1 1

2
mysql-test/r/rowid_order_innodb.result
View File

@ -14,7 +14,7 @@ insert into t1 values (-5, 1, 1),
(10, 1, 1);
explain select * from t1 force index(key1, key2) where key1 < 3 or key2 < 3;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index_merge key1,key2 key1,key2 5,5 NULL 6 Using where
1 SIMPLE t1 index_merge key1,key2 key1,key2 5,5 NULL 6 Using sort_union(key1,key2); Using where
select * from t1 force index(key1, key2) where key1 < 3 or key2 < 3;
pk1 key1 key2
-100 1 1

24
sql/opt_range.cc
View File

@ -1610,17 +1610,6 @@ int SQL_SELECT::test_quick_select(THD *thd, key_map keys_to_use,
}
param.key_parts_end=key_parts;
/* Calculate cost of full index read for the shortest covering index */
if (!head->used_keys.is_clear_all())
{
int key_for_use= find_shortest_key(head, &head->used_keys);
double key_read_time= get_index_only_read_time(&param, records,
key_for_use);
DBUG_PRINT("info", ("'all'+'using index' scan will be using key %d, "
"read time %g", key_for_use, key_read_time));
if (key_read_time < read_time)
read_time= key_read_time;
}
if ((tree=get_mm_tree(&param,cond)))
{
@ -1683,6 +1672,19 @@ int SQL_SELECT::test_quick_select(THD *thd, key_map keys_to_use,
SEL_IMERGE *imerge;
TABLE_READ_PLAN *best_conj_trp= NULL, *new_conj_trp;
LINT_INIT(new_conj_trp); /* no empty index_merge lists possible */
/* Calculate cost of full index read for the shortest covering index */
if (!head->used_keys.is_clear_all())
{
int key_for_use= find_shortest_key(head, &head->used_keys);
double key_read_time= get_index_only_read_time(&param, records,
key_for_use);
DBUG_PRINT("info", ("'all'+'using index' scan will be using key %d, "
"read time %g", key_for_use, key_read_time));
if (key_read_time < read_time)
read_time= key_read_time;
}
DBUG_PRINT("info",("No range reads possible,"
" trying to construct index_merge"));
List_iterator_fast<SEL_IMERGE> it(tree->merges);