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Merge 10.4 into 10.5

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This commit is contained in:
Marko Mäkelä 2020-06-05 20:36:43 +03:00
commit 6877ef9a7c
61 changed files with 841 additions and 477 deletions
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173
mysql-test/main/opt_trace.result
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@ -441,6 +441,7 @@ select * from v2 {
},
"rows_for_plan": 1,
"cost_for_plan": 2.404394531,
"cost_for_sorting": 1,
"estimated_join_cardinality": 1
}
]
@ -765,6 +766,7 @@ explain select * from v1 {
},
"rows_for_plan": 10,
"cost_for_plan": 4.021972656,
"cost_for_sorting": 10,
"estimated_join_cardinality": 10
}
]
@ -1452,6 +1454,7 @@ EXPLAIN SELECT MIN(d) FROM t1 where b=2 and c=3 group by a {
},
"rows_for_plan": 8,
"cost_for_plan": 3.8,
"cost_for_sorting": 8,
"estimated_join_cardinality": 8
}
]
@ -1645,6 +1648,7 @@ EXPLAIN SELECT id,MIN(a),MAX(a) FROM t1 WHERE a>=20010104e0 GROUP BY id {
},
"rows_for_plan": 9,
"cost_for_plan": 4.15,
"cost_for_sorting": 9,
"estimated_join_cardinality": 9
}
]
@ -1827,6 +1831,7 @@ EXPLAIN SELECT * FROM t1 WHERE a = 20010104e0 GROUP BY id {
},
"rows_for_plan": 9,
"cost_for_plan": 4.15,
"cost_for_sorting": 9,
"estimated_join_cardinality": 9
}
]
@ -8258,6 +8263,174 @@ JSON_DETAILED(JSON_EXTRACT(trace, '$**.range_scan_alternatives'))
]
]
drop table t1;
#
# MDEV-21626: Optimizer misses the details about the picked join order
#
CREATE TABLE t1(a INT, b INT, key(a));
INSERT INTO t1 SELECT seq, seq from seq_1_to_10;
CREATE TABLE t2(a INT, b INT, key(a));
INSERT INTO t2 SELECT seq, seq from seq_1_to_100;
SET OPTIMIZER_TRACE=1;
EXPLAIN SELECT * FROM t1, t2 WHERE t1.a=t2.a ORDER BY t2.b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL a NULL NULL NULL 10 Using where; Using temporary; Using filesort
1 SIMPLE t2 ref a a 5 test.t1.a 1
select JSON_DETAILED(JSON_EXTRACT(trace, '$**.considered_execution_plans')) from INFORMATION_SCHEMA.OPTIMIZER_TRACE;
JSON_DETAILED(JSON_EXTRACT(trace, '$**.considered_execution_plans'))
[
[
{
"plan_prefix":
[
],
"table": "t1",
"best_access_path":
{
"considered_access_paths":
[
{
"access_type": "scan",
"resulting_rows": 10,
"cost": 2.021972656,
"chosen": true
}
],
"chosen_access_method":
{
"type": "scan",
"records": 10,
"cost": 2.021972656,
"uses_join_buffering": false
}
},
"rows_for_plan": 10,
"cost_for_plan": 4.021972656,
"rest_of_plan":
[
{
"plan_prefix":
[
"t1"
],
"table": "t2",
"best_access_path":
{
"considered_access_paths":
[
{
"access_type": "ref",
"index": "a",
"used_range_estimates": false,
"cause": "not available",
"rows": 1,
"cost": 20.00585794,
"chosen": true
},
{
"access_type": "scan",
"resulting_rows": 100,
"cost": 2.219726562,
"chosen": false
}
],
"chosen_access_method":
{
"type": "ref",
"records": 1,
"cost": 20.00585794,
"uses_join_buffering": false
}
},
"rows_for_plan": 10,
"cost_for_plan": 26.0278306,
"cost_for_sorting": 10,
"estimated_join_cardinality": 10
}
]
},
{
"plan_prefix":
[
],
"table": "t2",
"best_access_path":
{
"considered_access_paths":
[
{
"access_type": "scan",
"resulting_rows": 100,
"cost": 2.219726562,
"chosen": true,
"use_tmp_table": true
}
],
"chosen_access_method":
{
"type": "scan",
"records": 100,
"cost": 2.219726562,
"uses_join_buffering": false
}
},
"rows_for_plan": 100,
"cost_for_plan": 22.21972656,
"rest_of_plan":
[
{
"plan_prefix":
[
"t2"
],
"table": "t1",
"best_access_path":
{
"considered_access_paths":
[
{
"access_type": "ref",
"index": "a",
"used_range_estimates": false,
"cause": "not available",
"rows": 1,
"cost": 200.0585794,
"chosen": true
},
{
"access_type": "scan",
"resulting_rows": 10,
"cost": 2.021972656,
"chosen": true
}
],
"chosen_access_method":
{
"type": "scan",
"records": 10,
"cost": 2.021972656,
"uses_join_buffering": true
}
},
"rows_for_plan": 1000,
"cost_for_plan": 224.2416992,
"pruned_by_cost": true
}
]
}
]
]
DROP TABLE t1,t2;
# End of 10.4 tests
#
# Test many rows to see output of big cost numbers