mirror of
https://github.com/MariaDB/server.git
synced 2025-01-17 20:42:30 +01:00
329 lines
11 KiB
Text
329 lines
11 KiB
Text
#
|
|
# Index merge tests
|
|
#
|
|
--disable_warnings
|
|
drop table if exists t0, t1, t2, t3, t4;
|
|
--enable_warnings
|
|
|
|
# Create and fill a table with simple keys
|
|
create table t0
|
|
(
|
|
key1 int not null,
|
|
INDEX i1(key1)
|
|
);
|
|
|
|
--disable_query_log
|
|
insert into t0 values (1),(2),(3),(4),(5),(6),(7),(8);
|
|
|
|
let $1=7;
|
|
set @d=8;
|
|
while ($1)
|
|
{
|
|
eval insert into t0 select key1+@d from t0;
|
|
eval set @d=@d*2;
|
|
dec $1;
|
|
}
|
|
--enable_query_log
|
|
|
|
alter table t0 add key2 int not null, add index i2(key2);
|
|
alter table t0 add key3 int not null, add index i3(key3);
|
|
alter table t0 add key4 int not null, add index i4(key4);
|
|
alter table t0 add key5 int not null, add index i5(key5);
|
|
alter table t0 add key6 int not null, add index i6(key6);
|
|
alter table t0 add key7 int not null, add index i7(key7);
|
|
alter table t0 add key8 int not null, add index i8(key8);
|
|
|
|
update t0 set key2=key1,key3=key1,key4=key1,key5=key1,key6=key1,key7=key1,key8=1024-key1;
|
|
analyze table t0;
|
|
|
|
# 1. One index
|
|
explain select * from t0 where key1 < 3 or key1 > 1020;
|
|
|
|
# 2. Simple cases
|
|
explain
|
|
select * from t0 where key1 < 3 or key2 > 1020;
|
|
select * from t0 where key1 < 3 or key2 > 1020;
|
|
|
|
explain select * from t0 where key1 < 3 or key2 <4;
|
|
|
|
explain
|
|
select * from t0 where (key1 > 30 and key1<35) or (key2 >32 and key2 < 40);
|
|
select * from t0 where (key1 > 30 and key1<35) or (key2 >32 and key2 < 40);
|
|
|
|
# 3. Check that index_merge doesn't break "ignore/force/use index"
|
|
explain select * from t0 ignore index (i2) where key1 < 3 or key2 <4;
|
|
explain select * from t0 where (key1 < 3 or key2 <4) and key3 = 50;
|
|
explain select * from t0 use index (i1,i2) where (key1 < 3 or key2 <4) and key3 = 50;
|
|
|
|
explain select * from t0 where (key1 > 1 or key2 > 2);
|
|
explain select * from t0 force index (i1,i2) where (key1 > 1 or key2 > 2);
|
|
|
|
|
|
# 4. Check if conjuncts are grouped by keyuse
|
|
explain
|
|
select * from t0 where key1<3 or key2<3 or (key1>5 and key1<8) or
|
|
(key1>10 and key1<12) or (key2>100 and key2<110);
|
|
|
|
# 5. Check index_merge with conjuncts that are always true/false
|
|
# verify fallback to "range" if there is only one non-confluent condition
|
|
explain select * from t0 where key2 = 45 or key1 <=> null;
|
|
|
|
explain select * from t0 where key2 = 45 or key1 is not null;
|
|
explain select * from t0 where key2 = 45 or key1 is null;
|
|
|
|
# the last conj. is always false and will be discarded
|
|
explain select * from t0 where key2=10 or key3=3 or key4 <=> null;
|
|
|
|
# the last conj. is always true and will cause 'all' scan
|
|
explain select * from t0 where key2=10 or key3=3 or key4 is null;
|
|
|
|
# some more complicated cases
|
|
explain select key1 from t0 where (key1 <=> null) or (key2 < 5) or
|
|
(key3=10) or (key4 <=> null);
|
|
explain select key1 from t0 where (key1 <=> null) or (key1 < 5) or
|
|
(key3=10) or (key4 <=> null);
|
|
|
|
# 6.Several ways to do index_merge, (ignored) index_merge vs. range
|
|
explain select * from t0 where
|
|
(key1 < 3 or key2 < 3) and (key3 < 4 or key4 < 4) and (key5 < 5 or key6 < 5);
|
|
|
|
explain
|
|
select * from t0 where (key1 < 3 or key2 < 6) and (key1 < 7 or key3 < 4);
|
|
|
|
select * from t0 where (key1 < 3 or key2 < 6) and (key1 < 7 or key3 < 4);
|
|
|
|
|
|
explain select * from t0 where
|
|
(key1 < 3 or key2 < 3) and (key3 < 4 or key4 < 4) and (key5 < 2 or key6 < 2);
|
|
|
|
# now index_merge is not used at all when "range" is possible
|
|
explain select * from t0 where
|
|
(key1 < 3 or key2 < 3) and (key3 < 100);
|
|
|
|
# this even can cause "all" scan:
|
|
explain select * from t0 where
|
|
(key1 < 3 or key2 < 3) and (key3 < 1000);
|
|
|
|
|
|
# 7. Complex cases
|
|
# tree_or(List<SEL_IMERGE>, range SEL_TREE).
|
|
explain select * from t0 where
|
|
((key1 < 4 or key2 < 4) and (key2 <5 or key3 < 4))
|
|
or
|
|
key2 > 5;
|
|
|
|
explain select * from t0 where
|
|
((key1 < 4 or key2 < 4) and (key2 <5 or key3 < 4))
|
|
or
|
|
key1 < 7;
|
|
|
|
select * from t0 where
|
|
((key1 < 4 or key2 < 4) and (key2 <5 or key3 < 4))
|
|
or
|
|
key1 < 7;
|
|
|
|
# tree_or(List<SEL_IMERGE>, List<SEL_IMERGE>).
|
|
explain select * from t0 where
|
|
((key1 < 4 or key2 < 4) and (key3 <5 or key5 < 4))
|
|
or
|
|
((key5 < 5 or key6 < 6) and (key7 <7 or key8 < 4));
|
|
|
|
explain select * from t0 where
|
|
((key3 <5 or key5 < 4) and (key1 < 4 or key2 < 4))
|
|
or
|
|
((key7 <7 or key8 < 4) and (key5 < 5 or key6 < 6));
|
|
|
|
explain select * from t0 where
|
|
((key3 <5 or key5 < 4) and (key1 < 4 or key2 < 4))
|
|
or
|
|
((key3 <7 or key5 < 2) and (key5 < 5 or key6 < 6));
|
|
|
|
explain select * from t0 where
|
|
((key3 <5 or key5 < 4) and (key1 < 4 or key2 < 4))
|
|
or
|
|
(((key3 <7 and key7 < 6) or key5 < 2) and (key5 < 5 or key6 < 6));
|
|
|
|
explain select * from t0 where
|
|
((key3 <5 or key5 < 4) and (key1 < 4 or key2 < 4))
|
|
or
|
|
((key3 >=5 or key5 < 2) and (key5 < 5 or key6 < 6));
|
|
|
|
explain select * from t0 force index(i1, i2, i3, i4, i5, i6 ) where
|
|
((key3 <5 or key5 < 4) and (key1 < 4 or key2 < 4))
|
|
or
|
|
((key3 >=5 or key5 < 2) and (key5 < 5 or key6 < 6));
|
|
|
|
# 8. Verify that "order by" after index merge uses filesort
|
|
select * from t0 where key1 < 5 or key8 < 4 order by key1;
|
|
|
|
explain
|
|
select * from t0 where key1 < 5 or key8 < 4 order by key1;
|
|
|
|
# 9. Check that index_merge cost is compared to 'index' where possible
|
|
create table t2 like t0;
|
|
insert into t2 select * from t0;
|
|
|
|
alter table t2 add index i1_3(key1, key3);
|
|
alter table t2 add index i2_3(key2, key3);
|
|
alter table t2 drop index i1;
|
|
alter table t2 drop index i2;
|
|
alter table t2 add index i321(key3, key2, key1);
|
|
|
|
# index_merge vs 'index', index_merge is better.
|
|
explain select key3 from t2 where key1 = 100 or key2 = 100;
|
|
|
|
# index_merge vs 'index', 'index' is better.
|
|
explain select key3 from t2 where key1 <100 or key2 < 100;
|
|
|
|
# index_merge vs 'all', index_merge is better.
|
|
explain select key7 from t2 where key1 <100 or key2 < 100;
|
|
|
|
# 10. Multipart keys.
|
|
create table t4 (
|
|
key1a int not null,
|
|
key1b int not null,
|
|
key2 int not null,
|
|
key2_1 int not null,
|
|
key2_2 int not null,
|
|
key3 int not null,
|
|
|
|
index i1a (key1a, key1b),
|
|
index i1b (key1b, key1a),
|
|
|
|
index i2_1(key2, key2_1),
|
|
index i2_2(key2, key2_1)
|
|
);
|
|
|
|
insert into t4 select key1,key1,key1 div 10, key1 % 10, key1 % 10, key1 from t0;
|
|
|
|
# the following will be handled by index_merge:
|
|
select * from t4 where key1a = 3 or key1b = 4;
|
|
explain select * from t4 where key1a = 3 or key1b = 4;
|
|
|
|
# and the following will not
|
|
explain select * from t4 where key2 = 1 and (key2_1 = 1 or key3 = 5);
|
|
|
|
explain select * from t4 where key2 = 1 and (key2_1 = 1 or key2_2 = 5);
|
|
|
|
explain select * from t4 where key2_1 = 1 or key2_2 = 5;
|
|
|
|
|
|
# 11. Multitable selects
|
|
create table t1 like t0;
|
|
insert into t1 select * from t0;
|
|
|
|
# index_merge on first table in join
|
|
explain select * from t0 left join t1 on (t0.key1=t1.key1)
|
|
where t0.key1=3 or t0.key2=4;
|
|
|
|
select * from t0 left join t1 on (t0.key1=t1.key1)
|
|
where t0.key1=3 or t0.key2=4;
|
|
|
|
explain
|
|
select * from t0,t1 where (t0.key1=t1.key1) and ( t0.key1=3 or t0.key2=4);
|
|
|
|
# index_merge vs. ref
|
|
explain
|
|
select * from t0,t1 where (t0.key1=t1.key1) and
|
|
(t0.key1=3 or t0.key2=4) and t1.key1<200;
|
|
|
|
# index_merge vs. ref
|
|
explain
|
|
select * from t0,t1 where (t0.key1=t1.key1) and
|
|
(t0.key1=3 or t0.key2<4) and t1.key1=2;
|
|
|
|
# index_merge on second table in join
|
|
explain select * from t0,t1 where t0.key1 = 5 and
|
|
(t1.key1 = t0.key1 or t1.key8 = t0.key1);
|
|
|
|
# Fix for bug#1974
|
|
explain select * from t0,t1 where t0.key1 < 3 and
|
|
(t1.key1 = t0.key1 or t1.key8 = t0.key1);
|
|
|
|
# index_merge inside union
|
|
explain select * from t1 where key1=3 or key2=4
|
|
union select * from t1 where key1<4 or key3=5;
|
|
|
|
# index merge in subselect
|
|
explain select * from (select * from t1 where key1 = 3 or key2 =3) as Z where key8 >5;
|
|
|
|
# 12. check for long index_merges.
|
|
create table t3 like t0;
|
|
insert into t3 select * from t0;
|
|
alter table t3 add key9 int not null, add index i9(key9);
|
|
alter table t3 add keyA int not null, add index iA(keyA);
|
|
alter table t3 add keyB int not null, add index iB(keyB);
|
|
alter table t3 add keyC int not null, add index iC(keyC);
|
|
update t3 set key9=key1,keyA=key1,keyB=key1,keyC=key1;
|
|
|
|
explain select * from t3 where
|
|
key1=1 or key2=2 or key3=3 or key4=4 or
|
|
key5=5 or key6=6 or key7=7 or key8=8 or
|
|
key9=9 or keyA=10 or keyB=11 or keyC=12;
|
|
|
|
select * from t3 where
|
|
key1=1 or key2=2 or key3=3 or key4=4 or
|
|
key5=5 or key6=6 or key7=7 or key8=8 or
|
|
key9=9 or keyA=10 or keyB=11 or keyC=12;
|
|
|
|
# Test for Bug#3183
|
|
explain select * from t0 where key1 < 3 or key2 < 4;
|
|
select * from t0 where key1 < 3 or key2 < 4;
|
|
|
|
update t0 set key8=123 where key1 < 3 or key2 < 4;
|
|
select * from t0 where key1 < 3 or key2 < 4;
|
|
|
|
delete from t0 where key1 < 3 or key2 < 4;
|
|
select * from t0 where key1 < 3 or key2 < 4;
|
|
select count(*) from t0;
|
|
|
|
# Test for BUG#4177
|
|
drop table t4;
|
|
create table t4 (a int);
|
|
insert into t4 values (1),(4),(3);
|
|
set @save_join_buffer_size=@@join_buffer_size;
|
|
set join_buffer_size= 4000;
|
|
explain select max(A.key1 + B.key1 + A.key2 + B.key2 + A.key3 + B.key3 + A.key4 + B.key4 + A.key5 + B.key5)
|
|
from t0 as A force index(i1,i2), t0 as B force index (i1,i2)
|
|
where (A.key1 < 500000 or A.key2 < 3)
|
|
and (B.key1 < 500000 or B.key2 < 3);
|
|
|
|
select max(A.key1 + B.key1 + A.key2 + B.key2 + A.key3 + B.key3 + A.key4 + B.key4 + A.key5 + B.key5)
|
|
from t0 as A force index(i1,i2), t0 as B force index (i1,i2)
|
|
where (A.key1 < 500000 or A.key2 < 3)
|
|
and (B.key1 < 500000 or B.key2 < 3);
|
|
|
|
update t0 set key1=1;
|
|
explain select max(A.key1 + B.key1 + A.key2 + B.key2 + A.key3 + B.key3 + A.key4 + B.key4 + A.key5 + B.key5)
|
|
from t0 as A force index(i1,i2), t0 as B force index (i1,i2)
|
|
where (A.key1 = 1 or A.key2 = 1)
|
|
and (B.key1 = 1 or B.key2 = 1);
|
|
|
|
select max(A.key1 + B.key1 + A.key2 + B.key2 + A.key3 + B.key3 + A.key4 + B.key4 + A.key5 + B.key5)
|
|
from t0 as A force index(i1,i2), t0 as B force index (i1,i2)
|
|
where (A.key1 = 1 or A.key2 = 1)
|
|
and (B.key1 = 1 or B.key2 = 1);
|
|
|
|
alter table t0 add filler1 char(200), add filler2 char(200), add filler3 char(200);
|
|
update t0 set key2=1, key3=1, key4=1, key5=1,key6=1,key7=1 where key7 < 500;
|
|
|
|
# The next query will not use index i7 in intersection if the OS doesn't
|
|
# support file sizes > 2GB. (ha_myisam::ref_length depends on this and index
|
|
# scan cost estimates depend on ha_myisam::ref_length)
|
|
--replace_column 9 #
|
|
--replace_result "4,4,4,4,4,4,4" X "4,4,4,4,4,4" X "i6,i7" "i6,i7?" "i6" "i6,i7?"
|
|
explain select max(A.key1 + B.key1 + A.key2 + B.key2 + A.key3 + B.key3 + A.key4 + B.key4 + A.key5 + B.key5)
|
|
from t0 as A, t0 as B
|
|
where (A.key1 = 1 and A.key2 = 1 and A.key3 = 1 and A.key4=1 and A.key5=1 and A.key6=1 and A.key7 = 1 or A.key8=1)
|
|
and (B.key1 = 1 and B.key2 = 1 and B.key3 = 1 and B.key4=1 and B.key5=1 and B.key6=1 and B.key7 = 1 or B.key8=1);
|
|
|
|
select max(A.key1 + B.key1 + A.key2 + B.key2 + A.key3 + B.key3 + A.key4 + B.key4 + A.key5 + B.key5)
|
|
from t0 as A, t0 as B
|
|
where (A.key1 = 1 and A.key2 = 1 and A.key3 = 1 and A.key4=1 and A.key5=1 and A.key6=1 and A.key7 = 1 or A.key8=1)
|
|
and (B.key1 = 1 and B.key2 = 1 and B.key3 = 1 and B.key4=1 and B.key5=1 and B.key6=1 and B.key7 = 1 or B.key8=1);
|
|
|
|
set join_buffer_size= @save_join_buffer_size;
|
|
# Test for BUG#4177 ends
|
|
|
|
drop table t0, t1, t2, t3, t4;
|
|
|