Quelle  opt_trace_index_merge_innodb.result   Sprache: Lisp

set @innodb_stats_persistent_save= @@innodb_stats_persistent;
set @innodb_stats_persistent_sample_pages_save=
@@innodb_stats_persistent_sample_pages;
set global innodb_stats_persistent= 1;
set global innodb_stats_persistent_sample_pages=100;
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)"
                }
              ]
            }
          },
          {
            "ref_optimizer_key_uses": [
              {
                "table": "t1",
                "index": "key1",
                "field": "key1",
                "equals": "1",
                "null_rejecting": false
              }
            ]
          },
          {
            "rows_estimation": [
              {
                "table": "t1",
                "range_analysis": {
                  "table_scan": {
                    "rows": 1000,
                    "cost": 0.1764192
                  },
                  "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": [],
                  "analyzing_range_alternatives": {
                    "range_scan_alternatives": [
                      {
                        "index": "PRIMARY",
                        "ranges": ["(pk1) < (0)", "(0) < (pk1)"],
                        "rowid_ordered": true,
                        "using_mrr": false,
                        "index_only": false,
                        "rows": 1000,
                        "cost": 0.16706826,
                        "chosen": true
                      },
                      {
                        "index": "key1",
                        "ranges": ["(1) <= (key1) <= (1)"],
                        "rowid_ordered": true,
                        "using_mrr": false,
                        "index_only": false,
                        "rows": 1,
                        "cost": 0.00424968,
                        "chosen": true
                      }
                    ],
                    "analyzing_roworder_intersect": {
                      "intersecting_indexes": [
                        {
                          "index": "key1",
                          "index_scan_cost": 0.001661605,
                          "cumulated_index_scan_cost": 0.001661605,
                          "disk_sweep_cost": 0.00171364,
                          "cumulative_total_cost": 0.003375245,
                          "usable": true,
                          "matching_rows_now": 1,
                          "intersect_covering_with_this_index": false,
                          "chosen": true
                        }
                      ],
                      "clustered_pk": {
                        "index_scan_cost": 0.000002653,
                        "cumulated_index_scan_cost": 0.001664258,
                        "disk_sweep_cost": 0.00171364,
                        "clustered_pk_added_to_intersect": false,
                        "cause": "cost"
                      },
                      "chosen": false,
                      "cause": "too few indexes to merge"
                    }
                  },
                  "group_index_range": {
                    "chosen": false,
                    "cause": "no group by or distinct"
                  },
                  "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": 0.00424968,
                    "chosen": true
                  }
                }
              },
              {
                "table": "t1",
                "rowid_filters": [
                  {
                    "key": "key1",
                    "build_cost": 0.001763258,
                    "rows": 1
                  }
                ]
              },
              {
                "selectivity_for_indexes": [
                  {
                    "index_name": "key1",
                    "selectivity_from_index": 0.001
                  },
                  {
                    "index_name": "PRIMARY",
                    "selectivity_from_index": 1
                  }
                ],
                "selectivity_for_columns": [],
                "cond_selectivity": 0.001
              }
            ]
          },
          {
            "table_dependencies": [
              {
                "table": "t1",
                "row_may_be_null": false,
                "map_bit": 0,
                "depends_on_map_bits": []
              }
            ]
          },
          {
            "considered_execution_plans": [
              {
                "plan_prefix": "",
                "get_costs_for_tables": [
                  {
                    "best_access_path": {
                      "table": "t1",
                      "plan_details": {
                        "record_count": 1
                      },
                      "considered_access_paths": [
                        {
                          "access_type": "ref",
                          "index": "key1",
                          "used_range_estimates": true,
                          "rows": 1,
                          "cost": 0.00345856,
                          "chosen": true
                        },
                        {
                          "type": "scan",
                          "chosen": false,
                          "cause": "cost"
                        }
                      ],
                      "chosen_access_method": {
                        "type": "ref",
                        "index": "key1",
                        "rows_read": 1,
                        "rows_out": 1,
                        "cost": 0.00345856,
                        "uses_join_buffering": false
                      }
                    }
                  }
                ]
              },
              {
                "plan_prefix": "",
                "table": "t1",
                "rows_for_plan": 1,
                "cost_for_plan": 0.00345856
              }
            ]
          },
          {
            "best_join_order": ["t1"],
            "rows": 1,
            "cost": 0.00345856
          },
          {
            "substitute_best_equal": {
              "condition": "WHERE",
              "resulting_condition": "t1.key1 = 1 and t1.pk1 <> 0"
            }
          },
          {
            "attaching_conditions_to_tables": {
              "attached_conditions_computation": [],
              "attached_conditions_summary": [
                {
                  "table": "t1",
                  "attached_condition": "t1.pk1 <> 0"
                }
              ]
            }
          },
          {
            "make_join_readinfo": [
              {
                "table": "t1",
                "index_condition": "t1.pk1 <> 0"
              }
            ]
          }
        ]
      }
    }
  ]
} 0 0
drop table t1;
set @@optimizer_switch= @tmp_index_merge_ror_cpk;
set global innodb_stats_persistent= @innodb_stats_persistent_save;
set global innodb_stats_persistent_sample_pages=
@innodb_stats_persistent_sample_pages_save;
#
# MDEV-18962: ASAN heap-buffer-overflow in Single_line_formatting_helper::on_add_str with optimizer trace
#
CREATE TABLE t1 (a date not null, b time, key(a), key(b)) ENGINE=InnoDB;
INSERT INTO t1 VALUES ('1991-09-09','00:00:00'),('2032-08-24','02:22:24');
SET SESSION optimizer_trace = 'enabled=on';
SELECT * FROM t1 WHERE b IS NULL AND a = '2000-01-01';
a b
DROP TABLE t1;
set optimizer_trace="enabled=off";