MariaDB [(none)]> set optimizer_trace_max_mem_size = 128*1024*1024;
Query OK, 0 rows affected (0.000 sec)

MariaDB [(none)]> set optimizer_trace=1;
Query OK, 0 rows affected (0.000 sec)

MariaDB [(none)]> analyze 
    -> SELECT 
    ->     esd.esd_c1,
    ->     esd.esd_c2,
    ->     esd.esd_c3,
    ->     es.es_c1,
    ->     es.es_c2,
    ->     es.es_c3,
    ->     es.es_c4,
    ->     es.es_c5,
    ->     es.es_c6,
    ->     es.es_c7,
    ->     es.es_c8
    -> FROM
    ->     DB1.t1 esd
    ->         INNER JOIN
    ->     DB1.t2 es ON esd.t1Id = es.t1Id
    ->         INNER JOIN
    ->     (SELECT 
    ->         esd.esd_c1, MAX(es.es_c1) AS last_set
    ->     FROM
    ->         DB1.t1 esd
    ->     INNER JOIN DB1.t2 es ON esd.t1Id = es.t1Id
    ->     GROUP BY esd.esd_c1) q ON esd.esd_c1 = q.esd_c1
    -> WHERE
    ->     es.es_c1 = q.last_set;
+------+-----------------+------------+-------+---------------------------+-----------+---------+----------------------------------------------+-------+----------+----------+------------+--------------------------+
| id   | select_type     | table      | type  | possible_keys             | key       | key_len | ref                                          | rows  | r_rows   | filtered | r_filtered | Extra                    |
+------+-----------------+------------+-------+---------------------------+-----------+---------+----------------------------------------------+-------+----------+----------+------------+--------------------------+
|    1 | PRIMARY         | esd        | index | PRIMARY,UNIQUEMSG,Index_3 | UNIQUEMSG | 137     | NULL                                         | 15197 | 15197.00 |   100.00 |     100.00 | Using where; Using index |
|    1 | PRIMARY         | <derived2> | ref   | key0                      | key0      | 33      | DB1.esd.esd_c1                          | 2     | 0.98     |   100.00 |     100.00 | Using where              |
|    1 | PRIMARY         | es         | ref   | PRIMARY                   | PRIMARY   | 9       | DB1.esd.t1Id,q.last_set | 157   | 21.26    |   100.00 |     100.00 |                          |
|    2 | LATERAL DERIVED | esd        | ref   | PRIMARY,UNIQUEMSG,Index_3 | UNIQUEMSG | 33      | DB1.esd.esd_c1                          | 7     | 17.40    |   100.00 |     100.00 | Using index              |
|    2 | LATERAL DERIVED | es         | ref   | PRIMARY                   | PRIMARY   | 4       | DB1.esd.t1Id            | 875   | 783.76   |   100.00 |     100.00 | Using index              |
+------+-----------------+------------+-------+---------------------------+-----------+---------+----------------------------------------------+-------+----------+----------+------------+--------------------------+
5 rows in set (1 min 12.157 sec)

MariaDB [(none)]> select * from INFORMATION_SCHEMA.OPTIMIZER_TRACE\G
*************************** 1. row ***************************
                            QUERY: analyze 
SELECT 
    esd.esd_c1,
    esd.esd_c2,
    esd.esd_c3,
    es.es_c1,
    es.es_c2,
    es.es_c3,
    es.es_c4,
    es.es_c5,
    es.es_c6,
    es.es_c7,
    es.es_c8
FROM
    DB1.t1 esd
        INNER JOIN
    DB1.t2 es ON esd.t1Id = es.t1Id
        INNER JOIN
    (SELECT 
        esd.esd_c1, MAX(es.es_c1) AS last_set
    FROM
        DB1.t1 esd
    INNER JOIN DB1.t2 es ON esd.t1Id = es.t1Id
    GROUP BY esd.esd_c1) q ON esd.esd_c1 = q.esd_c1
WHERE
    es.es_c1 = q.last_set
                            TRACE: {
  "steps": [
    {
      "join_preparation": {
        "select_id": 1,
        "steps": [
          {
            "derived": {
              "table": "q",
              "select_id": 2,
              "algorithm": "materialized"
            }
          },
          {
            "join_preparation": {
              "select_id": 2,
              "steps": [
                {
                  "expanded_query": "/* select#2 */ select DB1.esd.esd_c1 AS esd_c1,max(DB1.es.es_c1) AS last_set from (t1 esd join t2 es on(DB1.esd.t1Id = DB1.es.t1Id)) group by DB1.esd.esd_c1"
                }
              ]
            }
          },
          {
            "expanded_query": "/* select#1 */ select DB1.esd.esd_c1 AS esd_c1,DB1.esd.esd_c2 AS esd_c2,DB1.esd.esd_c3 AS esd_c3,DB1.es.es_c1 AS es_c1,DB1.es.`es_c2` AS `es_c2`,DB1.es.`es_c3` AS `es_c3`,DB1.es.es_c4 AS es_c4,DB1.es.`es_c5` AS `es_c5`,DB1.es.es_c6 AS es_c6,DB1.es.es_c7 AS es_c7,DB1.es.es_c8 AS es_c8 from ((t1 esd join t2 es on(DB1.esd.t1Id = DB1.es.t1Id)) join (/* select#2 */ select DB1.esd.esd_c1 AS esd_c1,max(DB1.es.es_c1) AS last_set from (t1 esd join t2 es on(DB1.esd.t1Id = DB1.es.t1Id)) group by DB1.esd.esd_c1) q on(DB1.esd.esd_c1 = q.esd_c1)) where DB1.es.es_c1 = q.last_set"
          }
        ]
      }
    },
    {
      "join_optimization": {
        "select_id": 1,
        "steps": [
          {
            "condition_processing": {
              "condition": "WHERE",
              "original_condition": "DB1.es.es_c1 = q.last_set and DB1.esd.esd_c1 = q.esd_c1 and DB1.esd.t1Id = DB1.es.t1Id",
              "steps": [
                {
                  "transformation": "equality_propagation",
                  "resulting_condition": "multiple equal(DB1.es.es_c1, q.last_set) and multiple equal(DB1.esd.esd_c1, q.esd_c1) and multiple equal(DB1.esd.t1Id, DB1.es.t1Id)"
                },
                {
                  "transformation": "constant_propagation",
                  "resulting_condition": "multiple equal(DB1.es.es_c1, q.last_set) and multiple equal(DB1.esd.esd_c1, q.esd_c1) and multiple equal(DB1.esd.t1Id, DB1.es.t1Id)"
                },
                {
                  "transformation": "trivial_condition_removal",
                  "resulting_condition": "multiple equal(DB1.es.es_c1, q.last_set) and multiple equal(DB1.esd.esd_c1, q.esd_c1) and multiple equal(DB1.esd.t1Id, DB1.es.t1Id)"
                }
              ]
            }
          },
          {
            "join_optimization": {
              "select_id": 2,
              "steps": [
                {
                  "condition_processing": {
                    "condition": "WHERE",
                    "original_condition": "DB1.esd.t1Id = DB1.es.t1Id",
                    "steps": [
                      {
                        "transformation": "equality_propagation",
                        "resulting_condition": "multiple equal(DB1.esd.t1Id, DB1.es.t1Id)"
                      },
                      {
                        "transformation": "constant_propagation",
                        "resulting_condition": "multiple equal(DB1.esd.t1Id, DB1.es.t1Id)"
                      },
                      {
                        "transformation": "trivial_condition_removal",
                        "resulting_condition": "multiple equal(DB1.esd.t1Id, DB1.es.t1Id)"
                      }
                    ]
                  }
                },
                {
                  "table_dependencies": [
                    {
                      "table": "esd",
                      "row_may_be_null": false,
                      "map_bit": 0,
                      "depends_on_map_bits": []
                    },
                    {
                      "table": "es",
                      "row_may_be_null": false,
                      "map_bit": 1,
                      "depends_on_map_bits": []
                    }
                  ]
                },
                {
                  "ref_optimizer_key_uses": [
                    {
                      "table": "esd",
                      "field": "t1Id",
                      "equals": "DB1.es.t1Id",
                      "null_rejecting": false
                    },
                    {
                      "table": "es",
                      "field": "t1Id",
                      "equals": "DB1.esd.t1Id",
                      "null_rejecting": false
                    }
                  ]
                },
                {
                  "rows_estimation": [
                    {
                      "table": "esd",
                      "range_analysis": {
                        "table_scan": {
                          "rows": 15197,
                          "cost": 3138.5
                        },
                        "potential_range_indexes": [
                          {
                            "index": "PRIMARY",
                            "usable": false,
                            "cause": "not applicable"
                          },
                          {
                            "index": "UNIQUEMSG",
                            "usable": true,
                            "key_parts": ["esd_c1", "esd_c2", "esd_c3"]
                          },
                          {
                            "index": "Index_1",
                            "usable": false,
                            "cause": "not applicable"
                          },
                          {
                            "index": "Index_3",
                            "usable": true,
                            "key_parts": ["esd_c1", "t1Id"]
                          }
                        ],
                        "best_covering_index_scan": {
                          "index": "Index_3",
                          "cost": 835.71,
                          "chosen": true
                        },
                        "setup_range_conditions": [],
                        "group_index_range": {
                          "chosen": false,
                          "cause": "not single_table"
                        }
                      }
                    },
                    {
                      "selectivity_for_indexes": [],
                      "selectivity_for_columns": [],
                      "cond_selectivity": 1
                    },
                    {
                      "table": "es",
                      "range_analysis": {
                        "table_scan": {
                          "rows": 12840562,
                          "cost": 2.67e6
                        }
                      }
                    },
                    {
                      "selectivity_for_indexes": [],
                      "selectivity_for_columns": [],
                      "cond_selectivity": 1
                    }
                  ]
                },
                {
                  "considered_execution_plans": [
                    {
                      "plan_prefix": [],
                      "table": "esd",
                      "best_access_path": {
                        "considered_access_paths": [
                          {
                            "access_type": "scan",
                            "resulting_rows": 15197,
                            "cost": 97,
                            "chosen": true,
                            "use_tmp_table": true
                          }
                        ],
                        "chosen_access_method": {
                          "type": "scan",
                          "records": 15197,
                          "cost": 97,
                          "uses_join_buffering": false
                        }
                      },
                      "rows_for_plan": 15197,
                      "cost_for_plan": 3136.4,
                      "rest_of_plan": [
                        {
                          "plan_prefix": ["esd"],
                          "table": "es",
                          "best_access_path": {
                            "considered_access_paths": [
                              {
                                "access_type": "ref",
                                "index": "PRIMARY",
                                "rows": 875.47,
                                "cost": 619910,
                                "chosen": true
                              },
                              {
                                "type": "scan",
                                "chosen": false,
                                "cause": "cost"
                              }
                            ],
                            "chosen_access_method": {
                              "type": "ref",
                              "records": 875.47,
                              "cost": 619910,
                              "uses_join_buffering": false
                            }
                          },
                          "rows_for_plan": 1.33e7,
                          "cost_for_plan": 3.28e6,
                          "cost_for_sorting": 1.33e7,
                          "estimated_join_cardinality": 1.33e7
                        }
                      ]
                    },
                    {
                      "plan_prefix": [],
                      "table": "es",
                      "best_access_path": {
                        "considered_access_paths": [
                          {
                            "access_type": "scan",
                            "resulting_rows": 1.28e7,
                            "cost": 103969,
                            "chosen": true
                          }
                        ],
                        "chosen_access_method": {
                          "type": "scan",
                          "records": 1.28e7,
                          "cost": 103969,
                          "uses_join_buffering": false
                        }
                      },
                      "rows_for_plan": 1.28e7,
                      "cost_for_plan": 2.67e6,
                      "rest_of_plan": [
                        {
                          "plan_prefix": ["es"],
                          "table": "esd",
                          "best_access_path": {
                            "considered_access_paths": [
                              {
                                "access_type": "eq_ref",
                                "index": "PRIMARY",
                                "rows": 1,
                                "cost": 1.28e7,
                                "chosen": true
                              },
                              {
                                "type": "scan",
                                "chosen": false,
                                "cause": "cost"
                              }
                            ],
                            "chosen_access_method": {
                              "type": "eq_ref",
                              "records": 1,
                              "cost": 1.28e7,
                              "uses_join_buffering": false
                            }
                          },
                          "rows_for_plan": 1.28e7,
                          "cost_for_plan": 1.81e7,
                          "pruned_by_cost": true
                        }
                      ]
                    }
                  ]
                }
              ]
            }
          },
          {
            "table_dependencies": [
              {
                "table": "esd",
                "row_may_be_null": false,
                "map_bit": 0,
                "depends_on_map_bits": []
              },
              {
                "table": "es",
                "row_may_be_null": false,
                "map_bit": 1,
                "depends_on_map_bits": []
              },
              {
                "table": "<derived2>",
                "row_may_be_null": false,
                "map_bit": 2,
                "depends_on_map_bits": []
              }
            ]
          },
          {
            "ref_optimizer_key_uses": [
              {
                "table": "esd",
                "field": "t1Id",
                "equals": "DB1.es.t1Id",
                "null_rejecting": false
              },
              {
                "table": "esd",
                "field": "esd_c1",
                "equals": "q.esd_c1",
                "null_rejecting": true
              },
              {
                "table": "esd",
                "field": "esd_c1",
                "equals": "q.esd_c1",
                "null_rejecting": true
              },
              {
                "table": "esd",
                "field": "t1Id",
                "equals": "DB1.es.t1Id",
                "null_rejecting": false
              },
              {
                "table": "es",
                "field": "t1Id",
                "equals": "DB1.esd.t1Id",
                "null_rejecting": false
              },
              {
                "table": "es",
                "field": "es_c1",
                "equals": "q.last_set",
                "null_rejecting": true
              },
              {
                "table": "<derived2>",
                "field": "esd_c1",
                "equals": "DB1.esd.esd_c1",
                "null_rejecting": true
              },
              {
                "table": "<derived2>",
                "field": "last_set",
                "equals": "DB1.es.es_c1",
                "null_rejecting": true
              }
            ]
          },
          {
            "rows_estimation": [
              {
                "table": "esd",
                "table_scan": {
                  "rows": 15197,
                  "cost": 97
                }
              },
              {
                "table": "es",
                "table_scan": {
                  "rows": 12840562,
                  "cost": 103969
                }
              },
              {
                "table": "<derived2>",
                "table_scan": {
                  "rows": 13304563,
                  "cost": 1.33e7
                }
              }
            ]
          },
          {
            "considered_execution_plans": [
              {
                "plan_prefix": [],
                "table": "esd",
                "best_access_path": {
                  "considered_access_paths": [
                    {
                      "access_type": "scan",
                      "resulting_rows": 15197,
                      "cost": 97,
                      "chosen": true
                    }
                  ],
                  "chosen_access_method": {
                    "type": "scan",
                    "records": 15197,
                    "cost": 97,
                    "uses_join_buffering": false
                  }
                },
                "rows_for_plan": 15197,
                "cost_for_plan": 3136.4,
                "rest_of_plan": [
                  {
                    "plan_prefix": ["esd"],
                    "table": "es",
                    "best_access_path": {
                      "considered_access_paths": [
                        {
                          "access_type": "ref",
                          "index": "PRIMARY",
                          "rows": 875.47,
                          "cost": 47949,
                          "chosen": true
                        },
                        {
                          "type": "scan",
                          "chosen": false,
                          "cause": "cost"
                        }
                      ],
                      "chosen_access_method": {
                        "type": "ref",
                        "records": 875.47,
                        "cost": 47949,
                        "uses_join_buffering": false
                      }
                    },
                    "rows_for_plan": 1.33e7,
                    "cost_for_plan": 2.71e6,
                    "rest_of_plan": [
                      {
                        "plan_prefix": ["esd", "es"],
                        "table": "<derived2>",
                        "best_access_path": {
                          "considered_access_paths": [
                            {
                              "considered_execution_plans": [
                                {
                                  "plan_prefix": [],
                                  "table": "esd",
                                  "best_access_path": {
                                    "considered_access_paths": [
                                      {
                                        "access_type": "ref",
                                        "index": "UNIQUEMSG",
                                        "rows": 7.7064,
                                        "cost": 1.012,
                                        "chosen": true
                                      },
                                      {
                                        "type": "scan",
                                        "chosen": false,
                                        "cause": "cost"
                                      }
                                    ],
                                    "chosen_access_method": {
                                      "type": "ref",
                                      "records": 7.7064,
                                      "cost": 1.012,
                                      "uses_join_buffering": false
                                    }
                                  },
                                  "rows_for_plan": 7.7064,
                                  "cost_for_plan": 2.5533,
                                  "rest_of_plan": [
                                    {
                                      "plan_prefix": ["esd"],
                                      "table": "es",
                                      "best_access_path": {
                                        "considered_access_paths": [
                                          {
                                            "access_type": "ref",
                                            "index": "PRIMARY",
                                            "rows": 875.47,
                                            "cost": 314.36,
                                            "chosen": true
                                          },
                                          {
                                            "type": "scan",
                                            "chosen": false,
                                            "cause": "cost"
                                          }
                                        ],
                                        "chosen_access_method": {
                                          "type": "ref",
                                          "records": 875.47,
                                          "cost": 314.36,
                                          "uses_join_buffering": false
                                        }
                                      },
                                      "rows_for_plan": 6746.7,
                                      "cost_for_plan": 1666.3,
                                      "cost_for_sorting": 6746.7,
                                      "estimated_join_cardinality": 6746.7
                                    }
                                  ]
                                },
                                {
                                  "plan_prefix": [],
                                  "table": "es",
                                  "best_access_path": {
                                    "considered_access_paths": [
                                      {
                                        "access_type": "scan",
                                        "resulting_rows": 1.28e7,
                                        "cost": 103969,
                                        "chosen": true
                                      }
                                    ],
                                    "chosen_access_method": {
                                      "type": "scan",
                                      "records": 1.28e7,
                                      "cost": 103969,
                                      "uses_join_buffering": false
                                    }
                                  },
                                  "rows_for_plan": 1.28e7,
                                  "cost_for_plan": 2.67e6,
                                  "pruned_by_cost": true
                                }
                              ]
                            },
                            {
                              "access_type": "ref",
                              "index": "key0",
                              "used_range_estimates": false,
                              "cause": "not available",
                              "rows": 875.47,
                              "cost": 6.29e8,
                              "chosen": true
                            },
                            {
                              "access_type": "ref",
                              "index": "key1",
                              "used_range_estimates": false,
                              "cause": "not available",
                              "rows": 1591.8,
                              "cost": 1.11e9,
                              "chosen": false,
                              "cause": "cost"
                            },
                            {
                              "access_type": "scan",
                              "resulting_rows": 1.33e7,
                              "cost": 1.6e11,
                              "chosen": false
                            }
                          ],
                          "chosen_access_method": {
                            "type": "ref",
                            "records": 875.47,
                            "cost": 6.29e8,
                            "uses_join_buffering": false
                          }
                        },
                        "rows_for_plan": 1.2e10,
                        "cost_for_plan": 2.96e9,
                        "estimated_join_cardinality": 1.2e10
                      }
                    ]
                  },
                  {
                    "plan_prefix": ["esd"],
                    "table": "<derived2>",
                    "best_access_path": {
                      "considered_access_paths": [
                        {
                          "access_type": "ref",
                          "index": "key0",
                          "used_range_estimates": false,
                          "cause": "not available",
                          "rows": 2,
                          "cost": 4.94e6,
                          "chosen": true
                        },
                        {
                          "type": "scan",
                          "chosen": false,
                          "cause": "cost"
                        }
                      ],
                      "chosen_access_method": {
                        "type": "ref",
                        "records": 2,
                        "cost": 4.94e6,
                        "uses_join_buffering": false
                      }
                    },
                    "rows_for_plan": 30394,
                    "cost_for_plan": 4.95e6,
                    "rest_of_plan": [
                      {
                        "plan_prefix": ["esd", "<derived2>"],
                        "table": "es",
                        "best_access_path": {
                          "considered_access_paths": [
                            {
                              "access_type": "ref",
                              "index": "PRIMARY",
                              "rows": 157.23,
                              "cost": 42147,
                              "chosen": true
                            },
                            {
                              "type": "scan",
                              "chosen": false,
                              "cause": "cost"
                            }
                          ],
                          "chosen_access_method": {
                            "type": "ref",
                            "records": 157.23,
                            "cost": 42147,
                            "uses_join_buffering": false
                          }
                        },
                        "rows_for_plan": 4.78e6,
                        "cost_for_plan": 5.95e6,
                        "estimated_join_cardinality": 4.78e6
                      }
                    ]
                  }
                ]
              },
              {
                "plan_prefix": [],
                "table": "es",
                "best_access_path": {
                  "considered_access_paths": [
                    {
                      "access_type": "scan",
                      "resulting_rows": 1.28e7,
                      "cost": 103969,
                      "chosen": true
                    }
                  ],
                  "chosen_access_method": {
                    "type": "scan",
                    "records": 1.28e7,
                    "cost": 103969,
                    "uses_join_buffering": false
                  }
                },
                "rows_for_plan": 1.28e7,
                "cost_for_plan": 2.67e6,
                "rest_of_plan": [
                  {
                    "plan_prefix": ["es"],
                    "table": "esd",
                    "best_access_path": {
                      "considered_access_paths": [
                        {
                          "access_type": "eq_ref",
                          "index": "PRIMARY",
                          "rows": 1,
                          "cost": 1.28e7,
                          "chosen": true
                        },
                        {
                          "access_type": "ref",
                          "index": "Index_3",
                          "rows": 1,
                          "cost": 1.28e7,
                          "chosen": false,
                          "cause": "no predicate for first keypart"
                        },
                        {
                          "type": "scan",
                          "chosen": false,
                          "cause": "cost"
                        }
                      ],
                      "chosen_access_method": {
                        "type": "eq_ref",
                        "records": 1,
                        "cost": 1.28e7,
                        "uses_join_buffering": false
                      }
                    },
                    "rows_for_plan": 1.28e7,
                    "cost_for_plan": 1.81e7,
                    "pruned_by_cost": true
                  },
                  {
                    "plan_prefix": ["es"],
                    "table": "<derived2>",
                    "best_access_path": {
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          INSUFFICIENT_PRIVILEGES: 0
1 row in set (0.015 sec)

MariaDB [(none)]> tee off