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- Backport @@optimizer_switch support from 6.0
- Add support for setting it as a server commandline argument - Add support for those switches: = no_index_merge = no_index_merge_union = no_index_merge_sort_union = no_index_merge_intersection mysql-test/r/index_merge_myisam.result: Testcases for index_merge related @@optimizer_switch flags. mysql-test/t/index_merge_myisam.test: Testcases for index_merge related @@optimizer_switch flags. sql/set_var.cc: - Backport @@optimizer_switch support from 6.0 - Add support for setting it as a server commandline argument sql/sql_class.h: - Backport @@optimizer_switch support from 6.0 sql/sql_select.h: - Backport @@optimizer_switch support from 6.0
This commit is contained in:
Sergey Petrunia
@ -1391,3 +1391,120 @@ WHERE
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`RUNID`= '' AND `SUBMITNR`= '' AND `ORDERNR`='' AND `PROGRAMM`='' AND
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`TESTID`='' AND `UCCHECK`='';
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drop table t1;
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#
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# @@optimizer_switch support and check
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#
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select @@optimizer_switch;
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@@optimizer_switch
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create table t0 (a int);
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insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
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create table t1 (a int, b int, c int, filler char(100),
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key(a), key(b), key(c));
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insert into t1 select
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A.a * B.a*10 + C.a*100,
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A.a * B.a*10 + C.a*100,
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A.a,
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'filler'
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from t0 A, t0 B, t0 C;
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This should use union:
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explain select * from t1 where a=1 or b=1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index_merge a,b a,b 5,5 NULL 2 Using union(a,b); Using where
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This should use ALL:
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set optimizer_switch='no_index_merge';
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explain select * from t1 where a=1 or b=1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ALL a,b NULL NULL NULL 1000 Using where
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This should use sort-union:
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set optimizer_switch='no_index_merge_union';
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explain select * from t1 where a=1 or b=1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index_merge a,b a,b 5,5 NULL 2 Using sort_union(a,b); Using where
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This will use sort-union:
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set optimizer_switch='';
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explain select * from t1 where a<1 or b <1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index_merge a,b a,b 5,5 NULL 38 Using sort_union(a,b); Using where
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This should use ALL:
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set optimizer_switch='no_index_merge_sort_union';
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explain select * from t1 where a<1 or b <1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ALL a,b NULL NULL NULL 1000 Using where
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This should use ALL:
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set optimizer_switch='no_index_merge';
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explain select * from t1 where a<1 or b <1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ALL a,b NULL NULL NULL 1000 Using where
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This will use sort-union:
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set optimizer_switch='no_index_merge_union';
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explain select * from t1 where a<1 or b <1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index_merge a,b a,b 5,5 NULL 38 Using sort_union(a,b); Using where
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alter table t1 add d int, add key(d);
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update t1 set d=a;
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This will use sort_union:
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set optimizer_switch='';
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explain select * from t1 where (a=3 or b in (1,2)) and (c=3 or d=4);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index_merge a,b,c,d a,b 5,5 NULL 3 Using sort_union(a,b); Using where
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And if we disable sort_union, union:
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set optimizer_switch='no_index_merge_sort_union';
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explain select * from t1 where (a=3 or b in (1,2)) and (c=3 or d=4);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index_merge a,b,c,d c,d 5,5 NULL 100 Using union(c,d); Using where
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drop table t1;
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create table t1 (
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a int, b int, c int,
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filler1 char(200), filler2 char(200),
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key(a),key(b),key(c)
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);
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insert into t1
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select A.a+10*B.a, A.a+10*B.a, A.a+10*B.a+100*C.a, 'foo', 'bar'
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from t0 A, t0 B, t0 C, t0 D where D.a<5;
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This should be intersect:
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set optimizer_switch='';
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explain select * from t1 where a=10 and b=10;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index_merge a,b a,b 5,5 NULL 1 Using intersect(a,b); Using where
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No intersect when index_merge is disabled:
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set optimizer_switch='no_index_merge';
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explain select * from t1 where a=10 and b=10;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref a,b a 5 const 49 Using where
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No intersect if it is disabled:
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set optimizer_switch='no_index_merge_intersection';
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explain select * from t1 where a=10 and b=10;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref a,b a 5 const 49 Using where
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Do intersect when union was disabled
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set optimizer_switch='no_index_merge_union';
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explain select * from t1 where a=10 and b=10;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index_merge a,b a,b 5,5 NULL 1 Using intersect(a,b); Using where
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Do intersect when sort_union was disabled
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set optimizer_switch='no_index_merge_sort_union';
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explain select * from t1 where a=10 and b=10;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index_merge a,b a,b 5,5 NULL 1 Using intersect(a,b); Using where
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This will use intersection inside a union:
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set optimizer_switch='';
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explain select * from t1 where a=10 and b=10 or c=10;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index_merge a,b,c a,b,c 5,5,5 NULL 6 Using union(intersect(a,b),c); Using where
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Should be only union left:
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set optimizer_switch='no_index_merge_intersection';
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explain select * from t1 where a=10 and b=10 or c=10;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index_merge a,b,c a,c 5,5 NULL 54 Using union(a,c); Using where
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This will switch to sort-union (intersection will be gone, too,
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thats a known limitation:
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set optimizer_switch='no_index_merge_union';
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explain select * from t1 where a=10 and b=10 or c=10;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index_merge a,b,c a,c 5,5 NULL 54 Using sort_union(a,c); Using where
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set optimizer_switch=default;
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show variables like 'optimizer_switch';
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Variable_name Value
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optimizer_switch
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drop table t0, t1;
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@ -19,3 +19,110 @@ let $merge_table_support= 1;
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--source include/index_merge2.inc
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--source include/index_merge_2sweeps.inc
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--source include/index_merge_ror_cpk.inc
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--echo #
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--echo # @@optimizer_switch support and check
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--echo #
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select @@optimizer_switch;
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create table t0 (a int);
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insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
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create table t1 (a int, b int, c int, filler char(100),
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key(a), key(b), key(c));
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insert into t1 select
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A.a * B.a*10 + C.a*100,
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A.a * B.a*10 + C.a*100,
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A.a,
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'filler'
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from t0 A, t0 B, t0 C;
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--echo This should use union:
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explain select * from t1 where a=1 or b=1;
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--echo This should use ALL:
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set optimizer_switch='no_index_merge';
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explain select * from t1 where a=1 or b=1;
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--echo This should use sort-union:
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set optimizer_switch='no_index_merge_union';
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explain select * from t1 where a=1 or b=1;
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--echo This will use sort-union:
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set optimizer_switch='';
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explain select * from t1 where a<1 or b <1;
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--echo This should use ALL:
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set optimizer_switch='no_index_merge_sort_union';
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explain select * from t1 where a<1 or b <1;
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--echo This should use ALL:
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set optimizer_switch='no_index_merge';
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explain select * from t1 where a<1 or b <1;
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--echo This will use sort-union:
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set optimizer_switch='no_index_merge_union';
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explain select * from t1 where a<1 or b <1;
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alter table t1 add d int, add key(d);
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update t1 set d=a;
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--echo This will use sort_union:
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set optimizer_switch='';
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explain select * from t1 where (a=3 or b in (1,2)) and (c=3 or d=4);
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--echo And if we disable sort_union, union:
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set optimizer_switch='no_index_merge_sort_union';
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explain select * from t1 where (a=3 or b in (1,2)) and (c=3 or d=4);
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drop table t1;
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# Now test that intersection can be disabled
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create table t1 (
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a int, b int, c int,
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filler1 char(200), filler2 char(200),
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key(a),key(b),key(c)
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);
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insert into t1
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select A.a+10*B.a, A.a+10*B.a, A.a+10*B.a+100*C.a, 'foo', 'bar'
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from t0 A, t0 B, t0 C, t0 D where D.a<5;
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--echo This should be intersect:
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set optimizer_switch='';
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explain select * from t1 where a=10 and b=10;
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--echo No intersect when index_merge is disabled:
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set optimizer_switch='no_index_merge';
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explain select * from t1 where a=10 and b=10;
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--echo No intersect if it is disabled:
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set optimizer_switch='no_index_merge_intersection';
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explain select * from t1 where a=10 and b=10;
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--echo Do intersect when union was disabled
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set optimizer_switch='no_index_merge_union';
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explain select * from t1 where a=10 and b=10;
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--echo Do intersect when sort_union was disabled
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set optimizer_switch='no_index_merge_sort_union';
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explain select * from t1 where a=10 and b=10;
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# Now take union-of-intersection and see how we can disable parts of it
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--echo This will use intersection inside a union:
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set optimizer_switch='';
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explain select * from t1 where a=10 and b=10 or c=10;
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--echo Should be only union left:
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set optimizer_switch='no_index_merge_intersection';
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explain select * from t1 where a=10 and b=10 or c=10;
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--echo This will switch to sort-union (intersection will be gone, too,
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--echo thats a known limitation:
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set optimizer_switch='no_index_merge_union';
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explain select * from t1 where a=10 and b=10 or c=10;
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set optimizer_switch=default;
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show variables like 'optimizer_switch';
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drop table t0, t1;
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