{
  "steps": [
    {
      "join_preparation": {
        "select_id": 1,
        "steps": [
          {
            "derived": {
              "table": "alias",
              "select_id": 2,
              "algorithm": "merged"
            }
          },
          {
            "join_preparation": {
              "select_id": 2,
              "steps": [
                {
                  "expanded_query": "/* select#2 */ select t2.b AS b,t2.c AS c from t2"
                }
              ]
            }
          },
          {
            "join_preparation": {
              "select_id": 3,
              "steps": [
                {
                  "expanded_query": "/* select#3 */ select 1 from t3 where t3.b = t3.c"
                }
              ]
            }
          },
          {
            "expanded_query": "/* select#1 */ select max(alias1.a + alias.b + alias.c) AS `max(a+b+c)` from t1 alias1 join (/* select#2 */ select t2.b AS b,t2.c AS c from t2) alias where <in_optimizer>(1,exists(/* select#3 */ select 1 from t3 where t3.b = t3.c limit 1)) or alias1.a <= 10"
          }
        ]
      }
    },
    {
      "join_optimization": {
        "select_id": 1,
        "steps": [
          {
            "join_optimization": {
              "select_id": 3,
              "steps": [
                {
                  "condition_processing": {
                    "condition": "WHERE",
                    "original_condition": "t3.b = t3.c",
                    "steps": [
                      {
                        "transformation": "equality_propagation",
                        "resulting_condition": "multiple equal(t3.b, t3.c)"
                      },
                      {
                        "transformation": "constant_propagation",
                        "resulting_condition": "multiple equal(t3.b, t3.c)"
                      },
                      {
                        "transformation": "trivial_condition_removal",
                        "resulting_condition": "multiple equal(t3.b, t3.c)"
                      }
                    ]
                  }
                },
                {
                  "ref_optimizer_key_uses": []
                },
                {
                  "rows_estimation": [
                    {
                      "table": "t3",
                      "table_scan": {
                        "rows": 20,
                        "read_cost": 0.0125237,
                        "read_and_compare_cost": 0.0131637
                      }
                    }
                  ]
                },
                {
                  "table_dependencies": [
                    {
                      "table": "t3",
                      "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": "t3",
                            "plan_details": {
                              "record_count": 1
                            },
                            "considered_access_paths": [
                              {
                                "access_type": "scan",
                                "rows": 20,
                                "rows_after_filter": 20,
                                "rows_out": 20,
                                "cost": 0.0131637,
                                "index_only": false,
                                "chosen": true
                              }
                            ],
                            "chosen_access_method": {
                              "type": "scan",
                              "rows_read": 20,
                              "rows_out": 20,
                              "cost": 0.0131637,
                              "uses_join_buffering": false
                            }
                          }
                        }
                      ]
                    },
                    {
                      "plan_prefix": "",
                      "table": "t3",
                      "rows_for_plan": 20,
                      "cost_for_plan": 0.0131637
                    }
                  ]
                },
                {
                  "best_join_order": ["t3"],
                  "rows": 20,
                  "cost": 0.0131637
                },
                {
                  "substitute_best_equal": {
                    "condition": "WHERE",
                    "resulting_condition": "t3.c = t3.b"
                  }
                },
                {
                  "attaching_conditions_to_tables": {
                    "attached_conditions_computation": [],
                    "attached_conditions_summary": [
                      {
                        "table": "t3",
                        "attached_condition": "t3.c = t3.b"
                      }
                    ]
                  }
                },
                {
                  "make_join_readinfo": []
                }
              ]
            }
          },
          {
            "condition_processing": {
              "condition": "WHERE",
              "original_condition": "<in_optimizer>(1,exists(/* select#3 */ select 1 from t3 where t3.c = t3.b limit 1)) or alias1.a <= 10",
              "steps": [
                {
                  "transformation": "equality_propagation",
                  "resulting_condition": "<in_optimizer>(1,exists(/* select#3 */ select 1 from t3 where t3.c = t3.b limit 1)) or alias1.a <= 10"
                },
                {
                  "transformation": "constant_propagation",
                  "resulting_condition": "<in_optimizer>(1,exists(/* select#3 */ select 1 from t3 where t3.c = t3.b limit 1)) or alias1.a <= 10"
                },
                {
                  "transformation": "trivial_condition_removal",
                  "resulting_condition": "alias1.a <= 10"
                }
              ]
            }
          },
          {
            "ref_optimizer_key_uses": []
          },
          {
            "rows_estimation": [
              {
                "selectivity_for_indexes": [],
                "selectivity_for_columns": [],
                "cond_selectivity": 1
              },
              {
                "table": "alias1",
                "table_scan": {
                  "rows": 14,
                  "read_cost": 0.01177727,
                  "read_and_compare_cost": 0.01222527
                }
              },
              {
                "table": "t2",
                "table_scan": {
                  "rows": 20,
                  "read_cost": 0.0125237,
                  "read_and_compare_cost": 0.0131637
                }
              }
            ]
          },
          {
            "table_dependencies": [
              {
                "table": "alias1",
                "row_may_be_null": false,
                "map_bit": 0,
                "depends_on_map_bits": []
              },
              {
                "table": "t2",
                "row_may_be_null": false,
                "map_bit": 1,
                "depends_on_map_bits": []
              }
            ]
          },
          {
            "considered_execution_plans": [
              {
                "plan_prefix": "",
                "get_costs_for_tables": [
                  {
                    "best_access_path": {
                      "table": "alias1",
                      "plan_details": {
                        "record_count": 1
                      },
                      "considered_access_paths": [
                        {
                          "access_type": "scan",
                          "rows": 14,
                          "rows_after_filter": 14,
                          "rows_out": 14,
                          "cost": 0.01222527,
                          "index_only": false,
                          "chosen": true
                        }
                      ],
                      "chosen_access_method": {
                        "type": "scan",
                        "rows_read": 14,
                        "rows_out": 14,
                        "cost": 0.01222527,
                        "uses_join_buffering": false
                      }
                    }
                  },
                  {
                    "best_access_path": {
                      "table": "t2",
                      "plan_details": {
                        "record_count": 1
                      },
                      "considered_access_paths": [
                        {
                          "access_type": "scan",
                          "rows": 20,
                          "rows_after_filter": 20,
                          "rows_out": 20,
                          "cost": 0.0131637,
                          "index_only": false,
                          "chosen": true
                        }
                      ],
                      "chosen_access_method": {
                        "type": "scan",
                        "rows_read": 20,
                        "rows_out": 20,
                        "cost": 0.0131637,
                        "uses_join_buffering": false
                      }
                    }
                  }
                ]
              },
              {
                "plan_prefix": "",
                "table": "alias1",
                "rows_for_plan": 14,
                "cost_for_plan": 0.01222527,
                "rest_of_plan": [
                  {
                    "plan_prefix": "alias1",
                    "get_costs_for_tables": [
                      {
                        "best_access_path": {
                          "table": "t2",
                          "plan_details": {
                            "record_count": 14
                          },
                          "considered_access_paths": [
                            {
                              "access_type": "scan_with_join_cache",
                              "rows": 20,
                              "rows_after_filter": 20,
                              "rows_out": 20,
                              "cost": 0.040018304,
                              "cost_without_join_buffer": 0.1842918,
                              "index_only": false,
                              "chosen": true
                            }
                          ],
                          "chosen_access_method": {
                            "type": "scan",
                            "rows_read": 20,
                            "rows_out": 20,
                            "cost": 0.040018304,
                            "uses_join_buffering": true
                          }
                        }
                      }
                    ]
                  },
                  {
                    "plan_prefix": "alias1",
                    "table": "t2",
                    "rows_for_plan": 280,
                    "cost_for_plan": 0.052243574
                  }
                ]
              },
              {
                "plan_prefix": "",
                "table": "t2",
                "rows_for_plan": 20,
                "cost_for_plan": 0.0131637,
                "pruned_by_heuristic": true
              }
            ]
          },
          {
            "best_join_order": ["alias1", "t2"],
            "rows": 280,
            "cost": 0.052243574
          },
          {
            "substitute_best_equal": {
              "condition": "WHERE",
              "resulting_condition": "alias1.a <= 10"
            }
          },
          {
            "attaching_conditions_to_tables": {
              "attached_conditions_computation": [],
              "attached_conditions_summary": [
                {
                  "table": "alias1",
                  "attached_condition": "alias1.a <= 10"
                },
                {
                  "table": "t2",
                  "attached_condition": null
                }
              ]
            }
          },
          {
            "make_join_readinfo": []
          },
          {
            "prepare_sum_aggregators": {
              "function": "max(alias1.a + t2.b + t2.c)",
              "aggregator_type": "simple"
            }
          }
        ]
      }
    }
  ]
}