+select * from information_schema.optimizer_trace limit 1;
+QUERY	SELECT * FROM t2 WHERE id <= 3
+TRACE	{
+  "steps": [
+    {
+      "join_preparation": {
+        "select_id": 1,
+        "steps": [
+          {
+            "expanded_query": "select t2.`id` AS `id`,t2.msg AS msg from t2 where t2.`id` <= 3"
+          }
+        ]
+      }
+    },
+    {
+      "join_optimization": {
+        "select_id": 1,
+        "steps": [
+          {
+            "condition_processing": {
+              "condition": "WHERE",
+              "original_condition": "t2.`id` <= 3",
+              "steps": [
+                {
+                  "transformation": "equality_propagation",
+                  "resulting_condition": "t2.`id` <= 3"
+                },
+                {
+                  "transformation": "constant_propagation",
+                  "resulting_condition": "t2.`id` <= 3"
+                },
+                {
+                  "transformation": "trivial_condition_removal",
+                  "resulting_condition": "t2.`id` <= 3"
+                }
+              ]
+            }
+          },
+          {
+            "table_dependencies": [
+              {
+                "table": "t2",
+                "row_may_be_null": false,
+                "map_bit": 0,
+                "depends_on_map_bits": []
+              }
+            ]
+          },
+          {
+            "ref_optimizer_key_uses": []
+          },
+          {
+            "rows_estimation": [
+              {
+                "table": "t2",
+                "range_analysis": {
+                  "table_scan": {
+                    "rows": 7,
+                    "cost": 0.113371474
+                  },
+                  "potential_range_indexes": [
+                    {
+                      "index": "PRIMARY",
+                      "usable": true,
+                      "key_parts": ["id"]
+                    }
+                  ],
+                  "setup_range_conditions": [],
+                  "analyzing_range_alternatives": {
+                    "range_scan_alternatives": [
+                      {
+                        "index": "PRIMARY",
+                        "ranges": ["(id) <= (3)"],
+                        "rowid_ordered": false,
+                        "using_mrr": false,
+                        "index_only": false,
+                        "rows": 2,
+                        "cost": 0.004554858,
+                        "chosen": true
+                      }
+                    ],
+                    "analyzing_roworder_intersect": {
+                      "cause": "too few roworder scans"
+                    },
+                    "analyzing_index_merge_union": []
+                  },
+                  "group_index_range": {
+                    "chosen": false,
+                    "cause": "no group by or distinct"
+                  },
+                  "chosen_range_access_summary": {
+                    "range_access_plan": {
+                      "type": "range_scan",
+                      "index": "PRIMARY",
+                      "rows": 2,
+                      "ranges": ["(id) <= (3)"]
+                    },
+                    "rows_for_plan": 2,
+                    "cost_for_plan": 0.004554858,
+                    "chosen": true
+                  }
+                }
+              },
+              {
+                "selectivity_for_indexes": [
+                  {
+                    "index_name": "PRIMARY",
+                    "selectivity_from_index": 0.285714286
+                  }
+                ],
+                "selectivity_for_columns": [],
+                "cond_selectivity": 0.285714286
+              }
+            ]
+          },
+          {
+            "considered_execution_plans": [
+              {
+                "plan_prefix": "",
+                "get_costs_for_tables": [
+                  {
+                    "best_access_path": {
+                      "table": "t2",
+                      "plan_details": {
+                        "record_count": 1
+                      },
+                      "considered_access_paths": [
+                        {
+                          "access_type": "range",
+                          "range_index": "PRIMARY",
+                          "rows": 2,
+                          "rows_after_filter": 2,
+                          "rows_out": 2,
+                          "cost": 0.004554858,
+                          "chosen": true
+                        }
+                      ],
+                      "chosen_access_method": {
+                        "type": "range",
+                        "index": "PRIMARY",
+                        "rows_read": 2,
+                        "rows_out": 2,
+                        "cost": 0.004554858,
+                        "uses_join_buffering": false
+                      }
+                    }
+                  }
+                ]
+              },
+              {
+                "plan_prefix": "",
+                "table": "t2",
+                "rows_for_plan": 2,
+                "cost_for_plan": 0.004554858
+              }
+            ]
+          },
+          {
+            "best_join_order": ["t2"],
+            "rows": 2,
+            "cost": 0.004554858
+          },
+          {
+            "substitute_best_equal": {
+              "condition": "WHERE",
+              "resulting_condition": "t2.`id` <= 3"
+            }
+          },
+          {
+            "attaching_conditions_to_tables": {
+              "attached_conditions_computation": [
+                {
+                  "table_condition_pushdown": {
+                    "table": "t2",
+                    "push_cond": "t2.`id` <= 3"
+                  }
+                }
+              ],
+              "attached_conditions_summary": [
+                {
+                  "table": "t2",
+                  "attached_condition": "t2.`id` <= 3"
+                }
+              ]
+            }
+          },
+          {
+            "make_join_readinfo": []
+          }
+        ]
+      }
+    }
+  ]
+}