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MDEV-7836: ANALYZE FORMAT=JSON should provide info about GROUP/ORDER BY
Provide basic info about sorting/grouping done by the queries.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,289 @@ | ||
| create table t0(a int); | ||
| insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9); | ||
| create table t1(a int); | ||
| insert into t1 select A.a + B.a* 10 + C.a * 100 from t0 A, t0 B, t0 C; | ||
| create table t2 ( | ||
| a int, | ||
| b int, | ||
| key (a) | ||
| ); | ||
| insert into t2 select A.a*1000 + B.a, A.a*1000 + B.a from t0 A, t1 B; | ||
| # | ||
| # Try an UPDATE that uses filesort: | ||
| # | ||
| explain | ||
| update t2 set b=b+1 order by b limit 5; | ||
| id select_type table type possible_keys key key_len ref rows Extra | ||
| 1 SIMPLE t2 ALL NULL NULL NULL NULL 10000 Using filesort | ||
| explain format=json | ||
| update t2 set b=b+1 order by b limit 5; | ||
| EXPLAIN | ||
| { | ||
| "query_block": { | ||
| "select_id": 1, | ||
| "filesort": { | ||
| "table": { | ||
| "update": 1, | ||
| "table_name": "t2", | ||
| "access_type": "ALL", | ||
| "rows": 10000 | ||
| } | ||
| } | ||
| } | ||
| } | ||
| analyze format=json | ||
| update t2 set b=b+1 order by b limit 5; | ||
| ANALYZE | ||
| { | ||
| "query_block": { | ||
| "select_id": 1, | ||
| "r_total_time_ms": "REPLACED", | ||
| "filesort": { | ||
| "r_loops": 1, | ||
| "r_limit": 5, | ||
| "r_used_priority_queue": true, | ||
| "r_output_rows": 6, | ||
| "table": { | ||
| "update": 1, | ||
| "table_name": "t2", | ||
| "access_type": "ALL", | ||
| "rows": 10000, | ||
| "r_rows": 10000, | ||
| "r_filtered": 100, | ||
| "r_total_time_ms": "REPLACED" | ||
| } | ||
| } | ||
| } | ||
| } | ||
| # | ||
| # Try an UPDATE that uses buffering: | ||
| # | ||
| explain | ||
| update t2 set a=a+1 where a<10; | ||
| id select_type table type possible_keys key key_len ref rows Extra | ||
| 1 SIMPLE t2 range a a 5 NULL 8 Using where; Using buffer | ||
| explain format=json | ||
| update t2 set a=a+1 where a<10; | ||
| EXPLAIN | ||
| { | ||
| "query_block": { | ||
| "select_id": 1, | ||
| "buffer": { | ||
| "table": { | ||
| "update": 1, | ||
| "table_name": "t2", | ||
| "access_type": "range", | ||
| "possible_keys": ["a"], | ||
| "key": "a", | ||
| "key_length": "5", | ||
| "used_key_parts": ["a"], | ||
| "rows": 8, | ||
| "attached_condition": "(t2.a < 10)" | ||
| } | ||
| } | ||
| } | ||
| } | ||
| analyze format=json | ||
| update t2 set a=a+1 where a<10; | ||
| ANALYZE | ||
| { | ||
| "query_block": { | ||
| "select_id": 1, | ||
| "r_total_time_ms": "REPLACED", | ||
| "buffer": { | ||
| "table": { | ||
| "update": 1, | ||
| "table_name": "t2", | ||
| "access_type": "range", | ||
| "possible_keys": ["a"], | ||
| "key": "a", | ||
| "key_length": "5", | ||
| "used_key_parts": ["a"], | ||
| "rows": 8, | ||
| "r_rows": 10, | ||
| "r_filtered": 100, | ||
| "r_total_time_ms": "REPLACED", | ||
| "attached_condition": "(t2.a < 10)" | ||
| } | ||
| } | ||
| } | ||
| } | ||
| # | ||
| # Try a DELETE that uses filesort: | ||
| # | ||
| explain | ||
| delete from t2 order by b limit 5; | ||
| id select_type table type possible_keys key key_len ref rows Extra | ||
| 1 SIMPLE t2 ALL NULL NULL NULL NULL 10000 Using filesort | ||
| explain format=json | ||
| delete from t2 order by b limit 5; | ||
| EXPLAIN | ||
| { | ||
| "query_block": { | ||
| "select_id": 1, | ||
| "filesort": { | ||
| "table": { | ||
| "delete": 1, | ||
| "table_name": "t2", | ||
| "access_type": "ALL", | ||
| "rows": 10000 | ||
| } | ||
| } | ||
| } | ||
| } | ||
| analyze format=json | ||
| delete from t2 order by b limit 5; | ||
| ANALYZE | ||
| { | ||
| "query_block": { | ||
| "select_id": 1, | ||
| "r_total_time_ms": "REPLACED", | ||
| "filesort": { | ||
| "r_loops": 1, | ||
| "r_used_priority_queue": false, | ||
| "r_output_rows": 10000, | ||
| "r_buffer_size": "195Kb", | ||
| "table": { | ||
| "delete": 1, | ||
| "table_name": "t2", | ||
| "access_type": "ALL", | ||
| "rows": 10000, | ||
| "r_rows": 10000, | ||
| "r_filtered": 100, | ||
| "r_total_time_ms": "REPLACED" | ||
| } | ||
| } | ||
| } | ||
| } | ||
| # | ||
| # Try a SELECT with QEP in form: filesort { tmp_table { join } } | ||
| # | ||
| explain | ||
| select * from t0,t2 where t2.a=t0.a order by t2.b limit 4; | ||
| id select_type table type possible_keys key key_len ref rows Extra | ||
| 1 SIMPLE t0 ALL NULL NULL NULL NULL 10 Using where; Using temporary; Using filesort | ||
| 1 SIMPLE t2 ref a a 5 test.t0.a 1 | ||
| explain format=json | ||
| select * from t0,t2 where t2.a=t0.a order by t2.b limit 4; | ||
| EXPLAIN | ||
| { | ||
| "query_block": { | ||
| "select_id": 1, | ||
| "temporary_table": { | ||
| "function": "buffer", | ||
| "table": { | ||
| "table_name": "t0", | ||
| "access_type": "ALL", | ||
| "rows": 10, | ||
| "filtered": 100, | ||
| "attached_condition": "(t0.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.t0.a"], | ||
| "rows": 1, | ||
| "filtered": 100 | ||
| } | ||
| } | ||
| } | ||
| } | ||
| analyze format=json | ||
| select * from t0,t2 where t2.a=t0.a order by t2.b limit 4; | ||
| ANALYZE | ||
| { | ||
| "query_block": { | ||
| "select_id": 1, | ||
| "r_loops": 1, | ||
| "r_total_time_ms": "REPLACED", | ||
| "filesort": { | ||
| "temporary_table": { | ||
| "table": { | ||
| "table_name": "t0", | ||
| "access_type": "ALL", | ||
| "r_loops": 1, | ||
| "rows": 10, | ||
| "r_rows": 10, | ||
| "r_total_time_ms": "REPLACED", | ||
| "filtered": 100, | ||
| "r_filtered": 100, | ||
| "attached_condition": "(t0.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.t0.a"], | ||
| "r_loops": 10, | ||
| "rows": 1, | ||
| "r_rows": 0.4, | ||
| "r_total_time_ms": "REPLACED", | ||
| "filtered": 100, | ||
| "r_filtered": 100 | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
| # | ||
| # Try a SELECT with QEP in form: join { filesort { table0 }, table2 } | ||
| # | ||
| explain | ||
| select * from t0,t2 where t2.a=t0.a order by t0.a limit 4; | ||
| id select_type table type possible_keys key key_len ref rows Extra | ||
| 1 SIMPLE t0 ALL NULL NULL NULL NULL 10 Using where; Using filesort | ||
| 1 SIMPLE t2 ref a a 5 test.t0.a 1 | ||
| analyze format=json | ||
| select * from t0,t2 where t2.a=t0.a order by t0.a limit 4; | ||
| ANALYZE | ||
| { | ||
| "query_block": { | ||
| "select_id": 1, | ||
| "r_loops": 1, | ||
| "r_total_time_ms": "REPLACED", | ||
| "read_sorted_file": { | ||
| "r_rows": 10, | ||
| "filesort": { | ||
| "r_loops": 1, | ||
| "r_used_priority_queue": false, | ||
| "r_output_rows": 10, | ||
| "r_buffer_size": "360", | ||
| "table": { | ||
| "table_name": "t0", | ||
| "access_type": "ALL", | ||
| "r_loops": 1, | ||
| "rows": 10, | ||
| "r_rows": 10, | ||
| "r_total_time_ms": "REPLACED", | ||
| "filtered": 100, | ||
| "r_filtered": 1, | ||
| "attached_condition": "(t0.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.t0.a"], | ||
| "r_loops": 10, | ||
| "rows": 1, | ||
| "r_rows": 0.4, | ||
| "r_total_time_ms": "REPLACED", | ||
| "filtered": 100, | ||
| "r_filtered": 100 | ||
| } | ||
| } | ||
| } | ||
| drop table t2; | ||
| drop table t0, t1; |
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