mirror of
https://github.com/MariaDB/server.git
synced 2025-07-27 18:02:13 +03:00
Merge branch '10.11' into 11.2
This commit is contained in:
@ -239,26 +239,28 @@ index (key1, pk),
|
||||
primary key (pk)
|
||||
);
|
||||
insert into t1
|
||||
select
|
||||
select
|
||||
seq, FLOOR(seq/100), 'filler'
|
||||
from
|
||||
from
|
||||
seq_1_to_1000;
|
||||
analyze table t1;
|
||||
Table Op Msg_type Msg_text
|
||||
test.t1 analyze status Engine-independent statistics collected
|
||||
test.t1 analyze status OK
|
||||
set optimizer_trace=1;
|
||||
explain select * from t1
|
||||
explain select * from t1
|
||||
where
|
||||
pk in (1,2,3,4,5) and
|
||||
key1 <= 4;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t1 range PRIMARY,key1 PRIMARY 4 NULL 5 Using where
|
||||
create temporary table opt_trace as
|
||||
select * from information_schema.optimizer_trace;
|
||||
# 11.0+ will not attempt to use selectivity(key1):
|
||||
select
|
||||
select
|
||||
json_detailed(json_extract(trace,'$**.selectivity_for_indexes')) as JS
|
||||
from
|
||||
information_schema.optimizer_trace;
|
||||
from
|
||||
opt_trace;
|
||||
JS
|
||||
[
|
||||
[
|
||||
@ -269,10 +271,10 @@ JS
|
||||
]
|
||||
]
|
||||
# Must not include 1.79...e308 as cost:
|
||||
select
|
||||
select
|
||||
json_detailed(json_extract(trace,'$**.best_access_path')) as JS
|
||||
from
|
||||
information_schema.optimizer_trace;
|
||||
from
|
||||
opt_trace;
|
||||
JS
|
||||
[
|
||||
{
|
||||
@ -303,6 +305,7 @@ JS
|
||||
}
|
||||
}
|
||||
]
|
||||
drop table opt_trace;
|
||||
drop table t1;
|
||||
#
|
||||
# Clean up
|
||||
|
Reference in New Issue
Block a user