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Fix for BUG#7266.

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mysql-test/r/greedy_optimizer.result:
  Adjusted query costs accordingly.
sql/sql_select.cc:
  Someone added this 0.001 cost factor to best_extension_by_limited_search(), but forgot to
  add it to the old version of the optimizer - find_best().
This commit is contained in:
unknown 2004-12-16 16:44:40 +02:00
parent f0f0e62882
commit 8a8c2272c0
2 changed files with 7 additions and 7 deletions
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12
mysql-test/r/greedy_optimizer.result
View File

@ -129,7 +129,7 @@ id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 Using index
show status like 'Last_query_cost';
Variable_name Value
Last_query_cost 821.838037
Last_query_cost 821.837037
explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 3
@ -141,7 +141,7 @@ id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 Using index
show status like 'Last_query_cost';
Variable_name Value
Last_query_cost 821.838037
Last_query_cost 821.837037
explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3
@ -153,7 +153,7 @@ id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using index
show status like 'Last_query_cost';
Variable_name Value
Last_query_cost 794.838037
Last_query_cost 794.837037
explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3
@ -165,7 +165,7 @@ id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using index
show status like 'Last_query_cost';
Variable_name Value
Last_query_cost 794.838037
Last_query_cost 794.837037
explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3
@ -177,7 +177,7 @@ id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using where
show status like 'Last_query_cost';
Variable_name Value
Last_query_cost 794.838037
Last_query_cost 794.837037
explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3
@ -189,7 +189,7 @@ id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using where
show status like 'Last_query_cost';
Variable_name Value
Last_query_cost 794.838037
Last_query_cost 794.837037
set optimizer_prune_level=0;
select @@optimizer_prune_level;
@@optimizer_prune_level

2
sql/sql_select.cc
View File

@ -4252,7 +4252,7 @@ find_best(JOIN *join,table_map rest_tables,uint idx,double record_count,
{
memcpy((gptr) join->best_positions,(gptr) join->positions,
sizeof(POSITION)*idx);
join->best_read=read_time;
join->best_read= read_time - 0.001;
}
return;
}