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MDEV-7674: ANALYZE shows r_rows=0

Change r_rows to be double
This commit is contained in:
Sergei Petrunia
2015-03-07 19:30:19 +03:00
parent 143f5d9172
commit 66ad265f3b
8 changed files with 142 additions and 66 deletions

View File

@ -24,7 +24,7 @@ insert into t1 select A.a*10 + B.a, A.a*10 + B.a, A.a*10 + B.a from t0 A, t0 B;
analyze
select * from t0, t1 where t1.a=t0.a and t0.a > 9;
id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
1 SIMPLE t0 ALL NULL NULL NULL NULL 10 10 100.00 0.00 Using where
1 SIMPLE t0 ALL NULL NULL NULL NULL 10 10.00 100.00 0.00 Using where
1 SIMPLE t1 ref a a 5 test.t0.a 1 NULL 100.00 NULL
analyze format=json
select * from t0, t1 where t1.a=t0.a and t0.a > 9;
@ -61,8 +61,8 @@ EXPLAIN
analyze
select * from t0, t1 where t1.a=t0.a and t1.b<4;
id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
1 SIMPLE t0 ALL NULL NULL NULL NULL 10 10 100.00 100.00 Using where
1 SIMPLE t1 ref a a 5 test.t0.a 1 1 100.00 40.00 Using where
1 SIMPLE t0 ALL NULL NULL NULL NULL 10 10.00 100.00 100.00 Using where
1 SIMPLE t1 ref a a 5 test.t0.a 1 1.00 100.00 40.00 Using where
analyze format=json
select * from t0, t1 where t1.a=t0.a and t1.b<4;
EXPLAIN
@ -99,8 +99,8 @@ EXPLAIN
analyze
select * from t1 tbl1, t1 tbl2 where tbl1.b<2 and tbl2.b>5;
id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
1 SIMPLE tbl1 ALL NULL NULL NULL NULL 100 100 100.00 2.00 Using where
1 SIMPLE tbl2 ALL NULL NULL NULL NULL 100 100 100.00 94.00 Using where; Using join buffer (flat, BNL join)
1 SIMPLE tbl1 ALL NULL NULL NULL NULL 100 100.00 100.00 2.00 Using where
1 SIMPLE tbl2 ALL NULL NULL NULL NULL 100 100.00 100.00 94.00 Using where; Using join buffer (flat, BNL join)
analyze format=json
select * from t1 tbl1, t1 tbl2 where tbl1.b<20 and tbl2.b<60;
EXPLAIN
@ -170,3 +170,43 @@ EXPLAIN
}
drop table t1;
drop table t0;
#
# MDEV-7674: ANALYZE shows r_rows=0
#
create table t1(a int);
insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
create table t2 (a int, key(a));
insert into t2 values (0),(1);
analyze format=json select * from t1 straight_join t2 force index(a) where t2.a=t1.a;
EXPLAIN
{
"query_block": {
"select_id": 1,
"table": {
"table_name": "t1",
"access_type": "ALL",
"r_loops": 1,
"rows": 10,
"r_rows": 10,
"filtered": 100,
"r_filtered": 100,
"attached_condition": "(t1.a is not null)"
},
"table": {
"table_name": "t2",
"access_type": "ref",
"possible_keys": ["a"],
"key": "a",
"key_length": "5",
"used_key_parts": ["a"],
"ref": ["test.t1.a"],
"r_loops": 10,
"rows": 2,
"r_rows": 0.2,
"filtered": 100,
"r_filtered": 100,
"using_index": true
}
}
}
drop table t1,t2;