diff options
Diffstat (limited to 'mysql-test/main/opt_trace_index_merge_innodb.result')
| -rw-r--r-- | mysql-test/main/opt_trace_index_merge_innodb.result | 242 |
1 files changed, 242 insertions, 0 deletions
diff --git a/mysql-test/main/opt_trace_index_merge_innodb.result b/mysql-test/main/opt_trace_index_merge_innodb.result new file mode 100644 index 00000000000..a0f03e326a3 --- /dev/null +++ b/mysql-test/main/opt_trace_index_merge_innodb.result @@ -0,0 +1,242 @@ +create table t1 +( +pk1 int not null, +pk2 int not null, +key1 int not null, +key2 int not null, +key (key1), +key (key2), +primary key (pk1, pk2) +)engine=Innodb; +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="enabled=on"; +set @tmp_index_merge_ror_cpk=@@optimizer_switch; +set optimizer_switch='extended_keys=off'; +explain select * from t1 where pk1 != 0 and key1 = 1; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1 ref PRIMARY,key1 key1 4 const 1 Using index condition +select * from information_schema.OPTIMIZER_TRACE; +QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES +explain select * from t1 where pk1 != 0 and key1 = 1 { + "steps": [ + { + "join_preparation": { + "select_id": 1, + "steps": [ + { + "expanded_query": "select `t1`.`pk1` AS `pk1`,`t1`.`pk2` AS `pk2`,`t1`.`key1` AS `key1`,`t1`.`key2` AS `key2` from `t1` where `t1`.`pk1` <> 0 and `t1`.`key1` = 1" + } + ] + } + }, + { + "join_optimization": { + "select_id": 1, + "steps": [ + { + "condition_processing": { + "condition": "WHERE", + "original_condition": "t1.pk1 <> 0 and t1.key1 = 1", + "steps": [ + { + "transformation": "equality_propagation", + "resulting_condition": "t1.pk1 <> 0 and multiple equal(1, t1.key1)" + }, + { + "transformation": "constant_propagation", + "resulting_condition": "t1.pk1 <> 0 and multiple equal(1, t1.key1)" + }, + { + "transformation": "trivial_condition_removal", + "resulting_condition": "t1.pk1 <> 0 and multiple equal(1, t1.key1)" + } + ] + } + }, + { + "table_dependencies": [ + { + "table": "t1", + "row_may_be_null": false, + "map_bit": 0, + "depends_on_map_bits": [] + } + ] + }, + { + "ref_optimizer_key_uses": [ + { + "table": "t1", + "field": "key1", + "equals": "1", + "null_rejecting": false + } + ] + }, + { + "rows_estimation": [ + { + "table": "t1", + "range_analysis": { + "table_scan": { + "rows": 1000, + "cost": 206.1 + }, + "potential_range_indexes": [ + { + "index": "PRIMARY", + "usable": true, + "key_parts": ["pk1", "pk2"] + }, + { + "index": "key1", + "usable": true, + "key_parts": ["key1"] + }, + { + "index": "key2", + "usable": false, + "cause": "not applicable" + } + ], + "setup_range_conditions": [], + "group_index_range": { + "chosen": false, + "cause": "no group by or distinct" + }, + "analyzing_range_alternatives": { + "range_scan_alternatives": [ + { + "index": "PRIMARY", + "ranges": ["pk1 < 0", "0 < pk1"], + "rowid_ordered": true, + "using_mrr": false, + "index_only": false, + "rows": 1001, + "cost": 203.59, + "chosen": true + }, + { + "index": "key1", + "ranges": ["1 <= key1 <= 1"], + "rowid_ordered": true, + "using_mrr": false, + "index_only": false, + "rows": 1, + "cost": 2.21, + "chosen": true + } + ], + "analyzing_roworder_intersect": { + "intersecting_indexes": [ + { + "index": "key1", + "index_scan_cost": 1, + "cumulateed_index_scan_cost": 1, + "disk_sweep_cost": 1.0014, + "cumulative_total_cost": 2.0014, + "usable": true, + "matching_rows_now": 1, + "intersect_covering_with_this_index": false, + "chosen": true + } + ], + "clustered_pk": { + "index_scan_cost": 0.002, + "cumulateed_index_scan_cost": 1.002, + "disk_sweep_cost": 1.0014, + "clustered_pk_added_to_intersect": false, + "cause": "cost" + }, + "chosen": false, + "cause": "too few indexes to merge" + }, + "analyzing_index_merge_union": [] + }, + "chosen_range_access_summary": { + "range_access_plan": { + "type": "range_scan", + "index": "key1", + "rows": 1, + "ranges": ["1 <= key1 <= 1"] + }, + "rows_for_plan": 1, + "cost_for_plan": 2.21, + "chosen": true + } + } + }, + { + "selectivity_for_indexes": [ + { + "index_name": "PRIMARY", + "selectivity_from_index": 1.001 + }, + { + "index_name": "key1", + "selectivity_from_index": 0.001 + } + ], + "selectivity_for_columns": [] + } + ] + }, + { + "execution_plan_for_potential_materialization": { + "steps": [] + } + }, + { + "considered_execution_plans": [ + { + "plan_prefix": [], + "table": "t1", + "best_access_path": { + "considered_access_paths": [ + { + "access_type": "ref", + "index": "key1", + "used_range_estimates": true, + "rows": 1, + "cost": 2, + "chosen": true + }, + { + "type": "scan", + "chosen": false, + "cause": "cost" + } + ] + } + } + ] + }, + { + "attaching_conditions_to_tables": { + "original_condition": "t1.key1 = 1 and t1.pk1 <> 0", + "attached_conditions_computation": [], + "attached_conditions_summary": [ + { + "table": "t1", + "attached": "t1.pk1 <> 0" + } + ] + } + } + ] + } + }, + { + "join_execution": { + "select_id": 1, + "steps": [] + } + } + ] +} 0 0 +drop table t1; +set @@optimizer_switch= @tmp_index_merge_ror_cpk; +set optimizer_trace="enabled=off"; |