SET optimizer_trace_max_mem_size=1048576;
SET end_markers_in_json=on;
SET optimizer_trace="enabled=on,one_line=off";
CREATE TABLE t1 (a INT);
CREATE TABLE t2 (a INT, b INT);
INSERT INTO t1 VALUES (2);
INSERT INTO t2 VALUES (1,7),(2,7);
# Subselect execute is traced every time it is executed
SET @@optimizer_trace_features="greedy_search=off,repeated_subselect=on";
SELECT (SELECT a FROM t1 WHERE t1.a=t2.a), a FROM t2;
(SELECT a FROM t1 WHERE t1.a=t2.a)	a
NULL	1
2	2

SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY	TRACE	MISSING_BYTES_BEYOND_MAX_MEM_SIZE	INSUFFICIENT_PRIVILEGES
SELECT (SELECT a FROM t1 WHERE t1.a=t2.a), a FROM t2	{
  "steps": [
    {
      "join_preparation": {
        "select#": 1,
        "steps": [
          {
            "join_preparation": {
              "select#": 2,
              "steps": [
                {
                  "expanded_query": "/* select#2 */ select `t1`.`a` from `t1` where (`t1`.`a` = `t2`.`a`)"
                }
              ] /* steps */
            } /* join_preparation */
          },
          {
            "expanded_query": "/* select#1 */ select (/* select#2 */ select `t1`.`a` from `t1` where (`t1`.`a` = `t2`.`a`)) AS `(SELECT a FROM t1 WHERE t1.a=t2.a)`,`t2`.`a` AS `a` from `t2`"
          }
        ] /* steps */
      } /* join_preparation */
    },
    {
      "join_optimization": {
        "select#": 1,
        "steps": [
          {
            "table_dependencies": [
              {
                "table": "`t2`",
                "row_may_be_null": false,
                "map_bit": 0,
                "depends_on_map_bits": [
                ] /* depends_on_map_bits */
              }
            ] /* table_dependencies */
          },
          {
            "rows_estimation": [
              {
                "table": "`t2`",
                "table_scan": {
                  "rows": 2,
                  "cost": 2
                } /* table_scan */
              }
            ] /* rows_estimation */
          },
          {
            "considered_execution_plans": "..."
          },
          {
            "attaching_conditions_to_tables": {
              "original_condition": null,
              "attached_conditions_computation": [
              ] /* attached_conditions_computation */,
              "attached_conditions_summary": [
                {
                  "table": "`t2`",
                  "attached": null
                }
              ] /* attached_conditions_summary */
            } /* attaching_conditions_to_tables */
          },
          {
            "refine_plan": [
              {
                "table": "`t2`",
                "access_type": "table_scan"
              }
            ] /* refine_plan */
          }
        ] /* steps */
      } /* join_optimization */
    },
    {
      "join_execution": {
        "select#": 1,
        "steps": [
          {
            "subselect_execution": {
              "select#": 2,
              "steps": [
                {
                  "join_optimization": {
                    "select#": 2,
                    "steps": [
                      {
                        "condition_processing": {
                          "condition": "WHERE",
                          "original_condition": "(`t1`.`a` = `t2`.`a`)",
                          "steps": [
                            {
                              "transformation": "equality_propagation",
                              "resulting_condition": "(`t1`.`a` = `t2`.`a`)"
                            },
                            {
                              "transformation": "constant_propagation",
                              "resulting_condition": "(`t1`.`a` = `t2`.`a`)"
                            },
                            {
                              "transformation": "trivial_condition_removal",
                              "resulting_condition": "(`t1`.`a` = `t2`.`a`)"
                            }
                          ] /* steps */
                        } /* condition_processing */
                      },
                      {
                        "table_dependencies": [
                          {
                            "table": "`t1`",
                            "row_may_be_null": false,
                            "map_bit": 0,
                            "depends_on_map_bits": [
                            ] /* depends_on_map_bits */
                          }
                        ] /* table_dependencies */
                      },
                      {
                        "ref_optimizer_key_uses": [
                        ] /* ref_optimizer_key_uses */
                      },
                      {
                        "rows_estimation": [
                          {
                            "table": "`t1`",
                            "rows": 1,
                            "cost": 1,
                            "table_type": "system",
                            "empty": false
                          }
                        ] /* rows_estimation */
                      },
                      {
                        "attaching_conditions_to_tables": {
                          "original_condition": "('2' = `t2`.`a`)",
                          "attached_conditions_computation": [
                          ] /* attached_conditions_computation */,
                          "attached_conditions_summary": [
                          ] /* attached_conditions_summary */
                        } /* attaching_conditions_to_tables */
                      },
                      {
                        "refine_plan": [
                        ] /* refine_plan */
                      }
                    ] /* steps */
                  } /* join_optimization */
                },
                {
                  "join_execution": {
                    "select#": 2,
                    "steps": [
                    ] /* steps */
                  } /* join_execution */
                }
              ] /* steps */
            } /* subselect_execution */
          },
          {
            "subselect_execution": {
              "select#": 2,
              "steps": [
                {
                  "join_execution": {
                    "select#": 2,
                    "steps": [
                    ] /* steps */
                  } /* join_execution */
                }
              ] /* steps */
            } /* subselect_execution */
          }
        ] /* steps */
      } /* join_execution */
    }
  ] /* steps */
}	0	0

# Subselect execute is traced only the first time it is executed
SET @@optimizer_trace_features="greedy_search=off,repeated_subselect=off";
SELECT (SELECT a FROM t1 WHERE t1.a=t2.a), a FROM t2;
(SELECT a FROM t1 WHERE t1.a=t2.a)	a
NULL	1
2	2

SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY	TRACE	MISSING_BYTES_BEYOND_MAX_MEM_SIZE	INSUFFICIENT_PRIVILEGES
SELECT (SELECT a FROM t1 WHERE t1.a=t2.a), a FROM t2	{
  "steps": [
    {
      "join_preparation": {
        "select#": 1,
        "steps": [
          {
            "join_preparation": {
              "select#": 2,
              "steps": [
                {
                  "expanded_query": "/* select#2 */ select `t1`.`a` from `t1` where (`t1`.`a` = `t2`.`a`)"
                }
              ] /* steps */
            } /* join_preparation */
          },
          {
            "expanded_query": "/* select#1 */ select (/* select#2 */ select `t1`.`a` from `t1` where (`t1`.`a` = `t2`.`a`)) AS `(SELECT a FROM t1 WHERE t1.a=t2.a)`,`t2`.`a` AS `a` from `t2`"
          }
        ] /* steps */
      } /* join_preparation */
    },
    {
      "join_optimization": {
        "select#": 1,
        "steps": [
          {
            "table_dependencies": [
              {
                "table": "`t2`",
                "row_may_be_null": false,
                "map_bit": 0,
                "depends_on_map_bits": [
                ] /* depends_on_map_bits */
              }
            ] /* table_dependencies */
          },
          {
            "rows_estimation": [
              {
                "table": "`t2`",
                "table_scan": {
                  "rows": 2,
                  "cost": 2
                } /* table_scan */
              }
            ] /* rows_estimation */
          },
          {
            "considered_execution_plans": "..."
          },
          {
            "attaching_conditions_to_tables": {
              "original_condition": null,
              "attached_conditions_computation": [
              ] /* attached_conditions_computation */,
              "attached_conditions_summary": [
                {
                  "table": "`t2`",
                  "attached": null
                }
              ] /* attached_conditions_summary */
            } /* attaching_conditions_to_tables */
          },
          {
            "refine_plan": [
              {
                "table": "`t2`",
                "access_type": "table_scan"
              }
            ] /* refine_plan */
          }
        ] /* steps */
      } /* join_optimization */
    },
    {
      "join_execution": {
        "select#": 1,
        "steps": [
          {
            "subselect_execution": {
              "select#": 2,
              "steps": [
                {
                  "join_optimization": {
                    "select#": 2,
                    "steps": [
                      {
                        "condition_processing": {
                          "condition": "WHERE",
                          "original_condition": "(`t1`.`a` = `t2`.`a`)",
                          "steps": [
                            {
                              "transformation": "equality_propagation",
                              "resulting_condition": "(`t1`.`a` = `t2`.`a`)"
                            },
                            {
                              "transformation": "constant_propagation",
                              "resulting_condition": "(`t1`.`a` = `t2`.`a`)"
                            },
                            {
                              "transformation": "trivial_condition_removal",
                              "resulting_condition": "(`t1`.`a` = `t2`.`a`)"
                            }
                          ] /* steps */
                        } /* condition_processing */
                      },
                      {
                        "table_dependencies": [
                          {
                            "table": "`t1`",
                            "row_may_be_null": false,
                            "map_bit": 0,
                            "depends_on_map_bits": [
                            ] /* depends_on_map_bits */
                          }
                        ] /* table_dependencies */
                      },
                      {
                        "ref_optimizer_key_uses": [
                        ] /* ref_optimizer_key_uses */
                      },
                      {
                        "rows_estimation": [
                          {
                            "table": "`t1`",
                            "rows": 1,
                            "cost": 1,
                            "table_type": "system",
                            "empty": false
                          }
                        ] /* rows_estimation */
                      },
                      {
                        "attaching_conditions_to_tables": {
                          "original_condition": "('2' = `t2`.`a`)",
                          "attached_conditions_computation": [
                          ] /* attached_conditions_computation */,
                          "attached_conditions_summary": [
                          ] /* attached_conditions_summary */
                        } /* attaching_conditions_to_tables */
                      },
                      {
                        "refine_plan": [
                        ] /* refine_plan */
                      }
                    ] /* steps */
                  } /* join_optimization */
                },
                {
                  "join_execution": {
                    "select#": 2,
                    "steps": [
                    ] /* steps */
                  } /* join_execution */
                }
              ] /* steps */
            } /* subselect_execution */
          }
        ] /* steps */
      } /* join_execution */
    }
  ] /* steps */
}	0	0

DROP TABLE t1,t2;
SET @@optimizer_trace_features="default";
CREATE TABLE t1 (a FLOAT(5,4) zerofill);
CREATE TABLE t2 (a FLOAT(5,4),b FLOAT(2,0));
SELECT t1.a
FROM t1
WHERE t1.a= (SELECT b FROM t2 LIMIT 1) AND NOT
t1.a= (SELECT a FROM t2 LIMIT 1) ;
a

SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY	TRACE	MISSING_BYTES_BEYOND_MAX_MEM_SIZE	INSUFFICIENT_PRIVILEGES
SELECT t1.a
FROM t1
WHERE t1.a= (SELECT b FROM t2 LIMIT 1) AND NOT
t1.a= (SELECT a FROM t2 LIMIT 1)	{
  "steps": [
    {
      "join_preparation": {
        "select#": 1,
        "steps": [
          {
            "join_preparation": {
              "select#": 2,
              "steps": [
                {
                  "expanded_query": "/* select#2 */ select `t2`.`b` from `t2` limit 1"
                }
              ] /* steps */
            } /* join_preparation */
          },
          {
            "join_preparation": {
              "select#": 3,
              "steps": [
                {
                  "expanded_query": "/* select#3 */ select `t2`.`a` from `t2` limit 1"
                }
              ] /* steps */
            } /* join_preparation */
          },
          {
            "expanded_query": "/* select#1 */ select `t1`.`a` AS `a` from `t1` where ((`t1`.`a` = (/* select#2 */ select `t2`.`b` from `t2` limit 1)) and (`t1`.`a` <> (/* select#3 */ select `t2`.`a` from `t2` limit 1)))"
          }
        ] /* steps */
      } /* join_preparation */
    },
    {
      "join_optimization": {
        "select#": 1,
        "steps": [
          {
            "condition_processing": {
              "condition": "WHERE",
              "original_condition": "((`t1`.`a` = (/* select#2 */ select `t2`.`b` from `t2` limit 1)) and (`t1`.`a` <> (/* select#3 */ select `t2`.`a` from `t2` limit 1)))",
              "steps": [
                {
                  "transformation": "equality_propagation",
                  "subselect_evaluation": [
                    {
                      "subselect_execution": {
                        "select#": 2,
                        "steps": [
                          {
                            "join_optimization": {
                              "select#": 2,
                              "steps": [
                                {
                                  "table_dependencies": [
                                    {
                                      "table": "`t2`",
                                      "row_may_be_null": false,
                                      "map_bit": 0,
                                      "depends_on_map_bits": [
                                      ] /* depends_on_map_bits */
                                    }
                                  ] /* table_dependencies */
                                },
                                {
                                  "rows_estimation": [
                                    {
                                      "table": "`t2`",
                                      "rows": 1,
                                      "cost": 1,
                                      "table_type": "system",
                                      "empty": true
                                    }
                                  ] /* rows_estimation */
                                }
                              ] /* steps */,
                              "empty_result": {
                                "cause": "no matching row in const table"
                              } /* empty_result */
                            } /* join_optimization */
                          },
                          {
                            "join_execution": {
                              "select#": 2,
                              "steps": [
                              ] /* steps */
                            } /* join_execution */
                          }
                        ] /* steps */
                      } /* subselect_execution */
                    },
                    {
                      "subselect_execution": {
                        "select#": 2,
                        "steps": [
                        ] /* steps */
                      } /* subselect_execution */
                    }
                  ] /* subselect_evaluation */,
                  "resulting_condition": "((NULL <> (/* select#3 */ select `t2`.`a` from `t2` limit 1)) and multiple equal((/* select#2 */ select NULL from `t2` limit 1), `t1`.`a`))"
                },
                {
                  "transformation": "constant_propagation",
                  "subselect_evaluation": [
                  ] /* subselect_evaluation */,
                  "resulting_condition": "((NULL <> (/* select#3 */ select `t2`.`a` from `t2` limit 1)) and multiple equal((/* select#2 */ select NULL from `t2` limit 1), `t1`.`a`))"
                },
                {
                  "transformation": "trivial_condition_removal",
                  "subselect_evaluation": [
                  ] /* subselect_evaluation */,
                  "resulting_condition": null
                }
              ] /* steps */
            } /* condition_processing */
          }
        ] /* steps */,
        "empty_result": {
          "cause": "Impossible WHERE"
        } /* empty_result */
      } /* join_optimization */
    },
    {
      "join_execution": {
        "select#": 1,
        "steps": [
        ] /* steps */
      } /* join_execution */
    }
  ] /* steps */
}	0	0

SELECT 1 FROM DUAL
WHERE NOT EXISTS
(SELECT * FROM t2 WHERE a = 50 AND b = 3);
1
1

SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY	TRACE	MISSING_BYTES_BEYOND_MAX_MEM_SIZE	INSUFFICIENT_PRIVILEGES
SELECT 1 FROM DUAL
WHERE NOT EXISTS
(SELECT * FROM t2 WHERE a = 50 AND b = 3)	{
  "steps": [
    {
      "join_preparation": {
        "select#": 1,
        "steps": [
          {
            "join_preparation": {
              "select#": 2,
              "steps": [
                {
                  "expanded_query": "/* select#2 */ select 1 from `t2` where ((`t2`.`a` = 50) and (`t2`.`b` = 3))"
                }
              ] /* steps */
            } /* join_preparation */
          },
          {
            "expanded_query": "/* select#1 */ select 1 AS `1` from DUAL  where (not(exists(/* select#2 */ select 1 from `t2` where ((`t2`.`a` = 50) and (`t2`.`b` = 3)))))"
          }
        ] /* steps */
      } /* join_preparation */
    },
    {
      "join_optimization": {
        "select#": 1,
        "steps": [
          {
            "condition_processing": {
              "condition": "WHERE",
              "original_condition": "(not(exists(/* select#2 */ select 1 from `t2` where ((`t2`.`a` = 50) and (`t2`.`b` = 3)))))",
              "steps": [
                {
                  "transformation": "equality_propagation",
                  "subselect_evaluation": [
                  ] /* subselect_evaluation */,
                  "resulting_condition": "(not(exists(/* select#2 */ select 1 from `t2` where ((`t2`.`a` = 50) and (`t2`.`b` = 3)))))"
                },
                {
                  "transformation": "constant_propagation",
                  "subselect_evaluation": [
                  ] /* subselect_evaluation */,
                  "resulting_condition": "(not(exists(/* select#2 */ select 1 from `t2` where ((`t2`.`a` = 50) and (`t2`.`b` = 3)))))"
                },
                {
                  "transformation": "trivial_condition_removal",
                  "subselect_evaluation": [
                    {
                      "subselect_execution": {
                        "select#": 2,
                        "steps": [
                          {
                            "join_optimization": {
                              "select#": 2,
                              "steps": [
                                {
                                  "condition_processing": {
                                    "condition": "WHERE",
                                    "original_condition": "((`t2`.`a` = 50) and (`t2`.`b` = 3))",
                                    "steps": [
                                      {
                                        "transformation": "equality_propagation",
                                        "resulting_condition": "((`t2`.`a` = 50) and (`t2`.`b` = 3))"
                                      },
                                      {
                                        "transformation": "constant_propagation",
                                        "resulting_condition": "((`t2`.`a` = 50) and (`t2`.`b` = 3))"
                                      },
                                      {
                                        "transformation": "trivial_condition_removal",
                                        "resulting_condition": "((`t2`.`a` = 50) and (`t2`.`b` = 3))"
                                      }
                                    ] /* steps */
                                  } /* condition_processing */
                                },
                                {
                                  "table_dependencies": [
                                    {
                                      "table": "`t2`",
                                      "row_may_be_null": false,
                                      "map_bit": 0,
                                      "depends_on_map_bits": [
                                      ] /* depends_on_map_bits */
                                    }
                                  ] /* table_dependencies */
                                },
                                {
                                  "ref_optimizer_key_uses": [
                                  ] /* ref_optimizer_key_uses */
                                },
                                {
                                  "rows_estimation": [
                                    {
                                      "table": "`t2`",
                                      "rows": 1,
                                      "cost": 1,
                                      "table_type": "system",
                                      "empty": true
                                    }
                                  ] /* rows_estimation */
                                }
                              ] /* steps */,
                              "empty_result": {
                                "cause": "no matching row in const table"
                              } /* empty_result */
                            } /* join_optimization */
                          },
                          {
                            "join_execution": {
                              "select#": 2,
                              "steps": [
                              ] /* steps */
                            } /* join_execution */
                          }
                        ] /* steps */
                      } /* subselect_execution */
                    }
                  ] /* subselect_evaluation */,
                  "resulting_condition": null
                }
              ] /* steps */
            } /* condition_processing */
          }
        ] /* steps */
      } /* join_optimization */
    },
    {
      "join_execution": {
        "select#": 1,
        "steps": [
        ] /* steps */
      } /* join_execution */
    }
  ] /* steps */
}	0	0

SELECT 1 FROM DUAL WHERE NOT EXISTS (SELECT DISTINCT(a) FROM t2 GROUP BY a ORDER BY b);
1
1

SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY	TRACE	MISSING_BYTES_BEYOND_MAX_MEM_SIZE	INSUFFICIENT_PRIVILEGES
SELECT 1 FROM DUAL WHERE NOT EXISTS (SELECT DISTINCT(a) FROM t2 GROUP BY a ORDER BY b)	{
  "steps": [
    {
      "join_preparation": {
        "select#": 1,
        "steps": [
          {
            "join_preparation": {
              "select#": 2,
              "steps": [
                {
                  "expanded_query": "/* select#2 */ select `t2`.`a` from `t2`"
                }
              ] /* steps */
            } /* join_preparation */
          },
          {
            "expanded_query": "/* select#1 */ select 1 AS `1` from DUAL  where (not(exists(/* select#2 */ select `t2`.`a` from `t2`)))"
          }
        ] /* steps */
      } /* join_preparation */
    },
    {
      "join_optimization": {
        "select#": 1,
        "steps": [
          {
            "condition_processing": {
              "condition": "WHERE",
              "original_condition": "(not(exists(/* select#2 */ select `t2`.`a` from `t2`)))",
              "steps": [
                {
                  "transformation": "equality_propagation",
                  "subselect_evaluation": [
                  ] /* subselect_evaluation */,
                  "resulting_condition": "(not(exists(/* select#2 */ select `t2`.`a` from `t2`)))"
                },
                {
                  "transformation": "constant_propagation",
                  "subselect_evaluation": [
                  ] /* subselect_evaluation */,
                  "resulting_condition": "(not(exists(/* select#2 */ select `t2`.`a` from `t2`)))"
                },
                {
                  "transformation": "trivial_condition_removal",
                  "subselect_evaluation": [
                    {
                      "subselect_execution": {
                        "select#": 2,
                        "steps": [
                          {
                            "join_optimization": {
                              "select#": 2,
                              "steps": [
                                {
                                  "table_dependencies": [
                                    {
                                      "table": "`t2`",
                                      "row_may_be_null": false,
                                      "map_bit": 0,
                                      "depends_on_map_bits": [
                                      ] /* depends_on_map_bits */
                                    }
                                  ] /* table_dependencies */
                                },
                                {
                                  "rows_estimation": [
                                    {
                                      "table": "`t2`",
                                      "rows": 1,
                                      "cost": 1,
                                      "table_type": "system",
                                      "empty": true
                                    }
                                  ] /* rows_estimation */
                                }
                              ] /* steps */,
                              "empty_result": {
                                "cause": "no matching row in const table"
                              } /* empty_result */
                            } /* join_optimization */
                          },
                          {
                            "join_execution": {
                              "select#": 2,
                              "steps": [
                              ] /* steps */
                            } /* join_execution */
                          }
                        ] /* steps */
                      } /* subselect_execution */
                    }
                  ] /* subselect_evaluation */,
                  "resulting_condition": null
                }
              ] /* steps */
            } /* condition_processing */
          }
        ] /* steps */
      } /* join_optimization */
    },
    {
      "join_execution": {
        "select#": 1,
        "steps": [
        ] /* steps */
      } /* join_execution */
    }
  ] /* steps */
}	0	0

DROP TABLE t1,t2;
#
# BUG#12905521 - ASSERT IN OPT_TRACE_STMT::SYNTAX_ERROR ON SELECT
# DISTINCT/MIN/JOIN/SUBQ QUERY
#
CREATE TABLE t1 (
pk INTEGER,
col_int_nokey INTEGER,
col_int_key INTEGER,
col_varchar_key VARCHAR(1),
col_varchar_nokey VARCHAR(1),
PRIMARY KEY (pk),
KEY (col_varchar_key,col_int_key)
) ENGINE=MYISAM;
CREATE TABLE t2 (
pk INTEGER,
col_int_nokey INTEGER,
col_int_key INTEGER,
col_varchar_key VARCHAR(1),
col_varchar_nokey VARCHAR(1),
PRIMARY KEY (pk),
KEY (col_varchar_key,col_int_key)
) ENGINE=MYISAM;
CREATE TABLE t3 (
pk INTEGER,
col_int_nokey INTEGER,
col_int_key INTEGER,
col_time_key TIME,
col_datetime_nokey DATETIME,
col_varchar_key VARCHAR(1),
col_varchar_nokey VARCHAR(1),
PRIMARY KEY (pk),
KEY (col_time_key),
KEY (col_varchar_key,col_int_key)
) ENGINE=MYISAM;
CREATE TABLE t4 (
pk INTEGER,
col_int_nokey INTEGER,
col_int_key INTEGER,
col_date_key DATE,
col_date_nokey DATE,
col_time_key TIME,
col_time_nokey TIME,
col_datetime_key DATETIME,
col_datetime_nokey DATETIME,
col_varchar_key VARCHAR(1),
col_varchar_nokey VARCHAR(1),
PRIMARY KEY (pk),
KEY (col_varchar_key,col_int_key)
) ENGINE=MYISAM;
INSERT INTO t4 (
col_int_key,col_int_nokey,
col_date_key,col_date_nokey,
col_time_key,col_time_nokey,
col_datetime_key,col_datetime_nokey,
col_varchar_key,col_varchar_nokey
) VALUES
(8,7,'2008-10-02','2008-10-02','04:07:22.028954','04:07:22.028954','2001-10-08 00:00:00','2001-10-08 00:00:00','g','g');
CREATE TABLE t5 (
pk INTEGER AUTO_INCREMENT,
col_int_nokey INTEGER,
col_int_key INTEGER,
col_date_key DATE,
col_date_nokey DATE,
col_time_key TIME,
col_time_nokey TIME,
col_datetime_key DATETIME,
col_datetime_nokey DATETIME,
col_varchar_key VARCHAR(1),
col_varchar_nokey VARCHAR(1),
PRIMARY KEY (pk),
KEY (col_int_key),
KEY (col_varchar_key,col_int_key)
) ENGINE=MYISAM;
INSERT INTO t5 (
col_int_key,col_int_nokey,
col_date_key,col_date_nokey,
col_time_key,col_time_nokey,
col_datetime_key,col_datetime_nokey,
col_varchar_key,col_varchar_nokey
) VALUES
(8,NULL,'2000-12-03','2000-12-03','22:55:23.019225','22:55:23.019225','2005-07-20 00:00:00','2005-07-20 00:00:00','x','x'),
(7,8,'2008-05-03','2008-05-03','10:19:31.050677','10:19:31.050677','2007-10-06 17:56:40.056051','2007-10-06 17:56:40.056051','d','d'),
(8,6,'2000-09-20','2000-09-20','14:11:27.044095','14:11:27.044095','2003-06-13 23:19:49.018300','2003-06-13 23:19:49.018300','c','c');
set @old_opt_switch=@@optimizer_switch;
select distinct
alias1.`col_varchar_key` as field1 ,alias1.`col_date_key` as
field2 ,( select min( sq1_alias1.`col_varchar_nokey` ) as sq1_field1 from ( t1
as sq1_alias1 inner join ( t5 as sq1_alias2 left join t5 as sq1_alias3 on
(sq1_alias3.`col_varchar_nokey` = sq1_alias2.`col_varchar_key` ) ) on
(sq1_alias3.`col_varchar_nokey` = sq1_alias2.`col_varchar_key` ) ) where
exists ( select distinct c_sq1_alias2.`col_int_nokey` as c_sq1_field1 from (
t3 as c_sq1_alias1 right join t4 as c_sq1_alias2 on (c_sq1_alias2.`col_int_nokey` = c_sq1_alias1.`pk` ) ) where
c_sq1_alias2.`col_varchar_key` = sq1_alias2.`col_varchar_nokey` ) ) as field3
,( select max( sq2_alias1.`pk` ) as sq2_field1 from t5 as sq2_alias1 ) as
field4 ,alias2.`col_varchar_nokey` as field5 ,alias2.`col_varchar_nokey` as
field6 from ( t5 as alias1 right outer join ( ( ( select sq3_alias2.* from ( t5 as sq3_alias1 ,t4 as sq3_alias2 ) ) as alias2 right join t4
as alias3 on (alias3.`col_varchar_key` = alias2.`col_varchar_key` ) ) ) on
(alias3.`col_int_key` = alias2.`pk` ) ) where ( alias1.`col_varchar_nokey` in
( select sq4_alias1.`col_varchar_key` as sq4_field1 from ( t3 as sq4_alias1
inner join ( t2 as sq4_alias2 right outer join t3 as sq4_alias3 on
(sq4_alias3.`pk` = sq4_alias2.`col_int_key` ) ) on
(sq4_alias3.`col_varchar_nokey` = sq4_alias2.`col_varchar_key` ) ) where
sq4_alias2.`col_int_key` < alias1.`col_int_nokey` and
sq4_alias3.`col_varchar_nokey` <> alias1.`col_varchar_key` ) ) and
alias1.`col_int_key` not in (214) group by field1,field2,field3,
field4,field5,field6;
field1	field2	field3	field4	field5	field6
select * from information_schema.optimizer_trace;
QUERY	TRACE	MISSING_BYTES_BEYOND_MAX_MEM_SIZE	INSUFFICIENT_PRIVILEGES
select distinct
alias1.`col_varchar_key` as field1 ,alias1.`col_date_key` as
field2 ,( select min( sq1_alias1.`col_varchar_nokey` ) as sq1_field1 from ( t1
as sq1_alias1 inner join ( t5 as sq1_alias2 left join t5 as sq1_alias3 on
(sq1_alias3.`col_varchar_nokey` = sq1_alias2.`col_varchar_key` ) ) on
(sq1_alias3.`col_varchar_nokey` = sq1_alias2.`col_varchar_key` ) ) where
exists ( select distinct c_sq1_alias2.`col_int_nokey` as c_sq1_field1 from (
t3 as c_sq1_alias1 right join t4 as c_sq1_alias2 on (c_sq1_alias2.`col_int_nokey` = c_sq1_alias1.`pk` ) ) where
c_sq1_alias2.`col_varchar_key` = sq1_alias2.`col_varchar_nokey` ) ) as field3
,( select max( sq2_alias1.`pk` ) as sq2_field1 from t5 as sq2_alias1 ) as
field4 ,alias2.`col_varchar_nokey` as field5 ,alias2.`col_varchar_nokey` as
field6 from ( t5 as alias1 right outer join ( ( ( select sq3_alias2.* from ( t5 as sq3_alias1 ,t4 as sq3_alias2 ) ) as alias2 right join t4
as alias3 on (alias3.`col_varchar_key` = alias2.`col_varchar_key` ) ) ) on
(alias3.`col_int_key` = alias2.`pk` ) ) where ( alias1.`col_varchar_nokey` in
( select sq4_alias1.`col_varchar_key` as sq4_field1 from ( t3 as sq4_alias1
inner join ( t2 as sq4_alias2 right outer join t3 as sq4_alias3 on
(sq4_alias3.`pk` = sq4_alias2.`col_int_key` ) ) on
(sq4_alias3.`col_varchar_nokey` = sq4_alias2.`col_varchar_key` ) ) where
sq4_alias2.`col_int_key` < alias1.`col_int_nokey` and
sq4_alias3.`col_varchar_nokey` <> alias1.`col_varchar_key` ) ) and
alias1.`col_int_key` not in (214) group by field1,field2,field3,
field4,field5,field6	{
  "steps": [
    {
      "join_preparation": {
        "select#": 5,
        "steps": [
          {
            "expanded_query": "/* select#5 */ select `sq3_alias2`.`pk` AS `pk`,`sq3_alias2`.`col_int_nokey` AS `col_int_nokey`,`sq3_alias2`.`col_int_key` AS `col_int_key`,`sq3_alias2`.`col_date_key` AS `col_date_key`,`sq3_alias2`.`col_date_nokey` AS `col_date_nokey`,`sq3_alias2`.`col_time_key` AS `col_time_key`,`sq3_alias2`.`col_time_nokey` AS `col_time_nokey`,`sq3_alias2`.`col_datetime_key` AS `col_datetime_key`,`sq3_alias2`.`col_datetime_nokey` AS `col_datetime_nokey`,`sq3_alias2`.`col_varchar_key` AS `col_varchar_key`,`sq3_alias2`.`col_varchar_nokey` AS `col_varchar_nokey` from (`t5` `sq3_alias1` join `t4` `sq3_alias2`)"
          }
        ] /* steps */
      } /* join_preparation */
    },
    {
      "join_preparation": {
        "select#": 1,
        "steps": [
          {
            "join_preparation": {
              "select#": 2,
              "steps": [
                {
                  "join_preparation": {
                    "select#": 3,
                    "steps": [
                      {
                        "expanded_query": "/* select#3 */ select `c_sq1_alias2`.`col_int_nokey` AS `c_sq1_field1` from (`t4` `c_sq1_alias2` left join `t3` `c_sq1_alias1` on((`c_sq1_alias2`.`col_int_nokey` = `c_sq1_alias1`.`pk`))) where (`c_sq1_alias2`.`col_varchar_key` = `sq1_alias2`.`col_varchar_nokey`)"
                      }
                    ] /* steps */
                  } /* join_preparation */
                },
                {
                  "expanded_query": "/* select#2 */ select min(`sq1_alias1`.`col_varchar_nokey`) AS `sq1_field1` from (`t1` `sq1_alias1` join (`t5` `sq1_alias2` left join `t5` `sq1_alias3` on((`sq1_alias3`.`col_varchar_nokey` = `sq1_alias2`.`col_varchar_key`))) on((`sq1_alias3`.`col_varchar_nokey` = `sq1_alias2`.`col_varchar_key`))) where exists(/* select#3 */ select `c_sq1_alias2`.`col_int_nokey` AS `c_sq1_field1` from (`t4` `c_sq1_alias2` left join `t3` `c_sq1_alias1` on((`c_sq1_alias2`.`col_int_nokey` = `c_sq1_alias1`.`pk`))) where (`c_sq1_alias2`.`col_varchar_key` = `sq1_alias2`.`col_varchar_nokey`))"
                }
              ] /* steps */
            } /* join_preparation */
          },
          {
            "join_preparation": {
              "select#": 4,
              "steps": [
                {
                  "expanded_query": "/* select#4 */ select max(`sq2_alias1`.`pk`) AS `sq2_field1` from `t5` `sq2_alias1`"
                }
              ] /* steps */
            } /* join_preparation */
          },
          {
            "join_preparation": {
              "select#": 6,
              "steps": [
                {
                  "expanded_query": "/* select#6 */ select `sq4_alias1`.`col_varchar_key` AS `sq4_field1` from (`t3` `sq4_alias1` join (`t3` `sq4_alias3` left join `t2` `sq4_alias2` on((`sq4_alias3`.`pk` = `sq4_alias2`.`col_int_key`))) on((`sq4_alias3`.`col_varchar_nokey` = `sq4_alias2`.`col_varchar_key`))) where ((`sq4_alias2`.`col_int_key` < `alias1`.`col_int_nokey`) and (`sq4_alias3`.`col_varchar_nokey` <> `alias1`.`col_varchar_key`) and (<cache>(`alias1`.`col_varchar_nokey`) = `sq4_alias1`.`col_varchar_key`))"
                },
                {
                  "transformation": {
                    "select#": 6,
                    "from": "IN (SELECT)",
                    "to": "semijoin",
                    "chosen": false
                  } /* transformation */
                }
              ] /* steps */
            } /* join_preparation */
          },
          {
            "expanded_query": "/* select#1 */ select distinct `alias1`.`col_varchar_key` AS `field1`,`alias1`.`col_date_key` AS `field2`,(/* select#2 */ select min(`sq1_alias1`.`col_varchar_nokey`) AS `sq1_field1` from (`t1` `sq1_alias1` join (`t5` `sq1_alias2` left join `t5` `sq1_alias3` on((`sq1_alias3`.`col_varchar_nokey` = `sq1_alias2`.`col_varchar_key`))) on((`sq1_alias3`.`col_varchar_nokey` = `sq1_alias2`.`col_varchar_key`))) where exists(/* select#3 */ select `c_sq1_alias2`.`col_int_nokey` AS `c_sq1_field1` from (`t4` `c_sq1_alias2` left join `t3` `c_sq1_alias1` on((`c_sq1_alias2`.`col_int_nokey` = `c_sq1_alias1`.`pk`))) where (`c_sq1_alias2`.`col_varchar_key` = `sq1_alias2`.`col_varchar_nokey`))) AS `field3`,(/* select#4 */ select max(`sq2_alias1`.`pk`) AS `sq2_field1` from `t5` `sq2_alias1`) AS `field4`,`alias2`.`col_varchar_nokey` AS `field5`,`alias2`.`col_varchar_nokey` AS `field6` from ((`t4` `alias3` left join ((/* select#5 */ select `sq3_alias2`.`pk` AS `pk`,`sq3_alias2`.`col_int_nokey` AS `col_int_nokey`,`sq3_alias2`.`col_int_key` AS `col_int_key`,`sq3_alias2`.`col_date_key` AS `col_date_key`,`sq3_alias2`.`col_date_nokey` AS `col_date_nokey`,`sq3_alias2`.`col_time_key` AS `col_time_key`,`sq3_alias2`.`col_time_nokey` AS `col_time_nokey`,`sq3_alias2`.`col_datetime_key` AS `col_datetime_key`,`sq3_alias2`.`col_datetime_nokey` AS `col_datetime_nokey`,`sq3_alias2`.`col_varchar_key` AS `col_varchar_key`,`sq3_alias2`.`col_varchar_nokey` AS `col_varchar_nokey` from (`t5` `sq3_alias1` join `t4` `sq3_alias2`))) `alias2` on((`alias3`.`col_varchar_key` = `alias2`.`col_varchar_key`))) left join `t5` `alias1` on((`alias3`.`col_int_key` = `alias2`.`pk`))) where (<in_optimizer>(`alias1`.`col_varchar_nokey`,<exists>(/* select#6 */ select `sq4_alias1`.`col_varchar_key` AS `sq4_field1` from (`t3` `sq4_alias1` join (`t3` `sq4_alias3` left join `t2` `sq4_alias2` on((`sq4_alias3`.`pk` = `sq4_alias2`.`col_int_key`))) on((`sq4_alias3`.`col_varchar_nokey` = `sq4_alias2`.`col_varchar_key`))) where ((`sq4_alias2`.`col_int_key` < `alias1`.`col_int_nokey`) and (`sq4_alias3`.`col_varchar_nokey` <> `alias1`.`col_varchar_key`) and (<cache>(`alias1`.`col_varchar_nokey`) = `sq4_alias1`.`col_varchar_key`)))) and (`alias1`.`col_int_key` <> 214)) group by `field1`,`field2`,`field3`,`field4`,`field5`,`field6`"
          }
        ] /* steps */
      } /* join_preparation */
    },
    {
      "join_optimization": {
        "select#": 1,
        "steps": [
          {
            "join_optimization": {
              "select#": 5,
              "steps": [
                {
                  "transformations_to_nested_joins": {
                    "transformations": [
                      "parenthesis_removal"
                    ] /* transformations */,
                    "expanded_query": "/* select#5 */ select `sq3_alias2`.`pk` AS `pk`,`sq3_alias2`.`col_int_nokey` AS `col_int_nokey`,`sq3_alias2`.`col_int_key` AS `col_int_key`,`sq3_alias2`.`col_date_key` AS `col_date_key`,`sq3_alias2`.`col_date_nokey` AS `col_date_nokey`,`sq3_alias2`.`col_time_key` AS `col_time_key`,`sq3_alias2`.`col_time_nokey` AS `col_time_nokey`,`sq3_alias2`.`col_datetime_key` AS `col_datetime_key`,`sq3_alias2`.`col_datetime_nokey` AS `col_datetime_nokey`,`sq3_alias2`.`col_varchar_key` AS `col_varchar_key`,`sq3_alias2`.`col_varchar_nokey` AS `col_varchar_nokey` from `t5` `sq3_alias1` join `t4` `sq3_alias2`"
                  } /* transformations_to_nested_joins */
                },
                {
                  "table_dependencies": [
                    {
                      "table": "`t5` `sq3_alias1`",
                      "row_may_be_null": false,
                      "map_bit": 0,
                      "depends_on_map_bits": [
                      ] /* depends_on_map_bits */
                    },
                    {
                      "table": "`t4` `sq3_alias2`",
                      "row_may_be_null": false,
                      "map_bit": 1,
                      "depends_on_map_bits": [
                      ] /* depends_on_map_bits */
                    }
                  ] /* table_dependencies */
                },
                {
                  "rows_estimation": [
                    {
                      "table": "`t5` `sq3_alias1`",
                      "table_scan": {
                        "rows": 3,
                        "cost": 2
                      } /* table_scan */
                    },
                    {
                      "table": "`t4` `sq3_alias2`",
                      "rows": 1,
                      "cost": 1,
                      "table_type": "system",
                      "empty": false
                    }
                  ] /* rows_estimation */
                },
                {
                  "considered_execution_plans": [
                    {
                      "plan_prefix": [
                        "`t4` `sq3_alias2`"
                      ] /* plan_prefix */,
                      "table": "`t5` `sq3_alias1`",
                      "best_access_path": {
                        "considered_access_paths": [
                          {
                            "access_type": "scan",
                            "rows": 3,
                            "cost": 2.6342,
                            "chosen": true
                          }
                        ] /* considered_access_paths */
                      } /* best_access_path */,
                      "cost_for_plan": 2.6342,
                      "rows_for_plan": 3,
                      "chosen": true
                    }
                  ] /* considered_execution_plans */
                },
                {
                  "attaching_conditions_to_tables": {
                    "original_condition": null,
                    "attached_conditions_computation": [
                    ] /* attached_conditions_computation */,
                    "attached_conditions_summary": [
                      {
                        "table": "`t5` `sq3_alias1`",
                        "attached": null
                      }
                    ] /* attached_conditions_summary */
                  } /* attaching_conditions_to_tables */
                },
                {
                  "refine_plan": [
                    {
                      "table": "`t5` `sq3_alias1`",
                      "access_type": "index_scan"
                    }
                  ] /* refine_plan */
                }
              ] /* steps */
            } /* join_optimization */
          },
          {
            "transformations_to_nested_joins": {
              "transformations": [
                "outer_join_to_inner_join",
                "JOIN_condition_to_WHERE",
                "parenthesis_removal"
              ] /* transformations */,
              "expanded_query": "/* select#1 */ select distinct `alias1`.`col_varchar_key` AS `field1`,`alias1`.`col_date_key` AS `field2`,(/* select#2 */ select min(`sq1_alias1`.`col_varchar_nokey`) AS `sq1_field1` from (`t1` `sq1_alias1` join (`t5` `sq1_alias2` left join `t5` `sq1_alias3` on((`sq1_alias3`.`col_varchar_nokey` = `sq1_alias2`.`col_varchar_key`))) on((`sq1_alias3`.`col_varchar_nokey` = `sq1_alias2`.`col_varchar_key`))) where exists(/* select#3 */ select `c_sq1_alias2`.`col_int_nokey` AS `c_sq1_field1` from (`t4` `c_sq1_alias2` left join `t3` `c_sq1_alias1` on((`c_sq1_alias2`.`col_int_nokey` = `c_sq1_alias1`.`pk`))) where (`c_sq1_alias2`.`col_varchar_key` = `sq1_alias2`.`col_varchar_nokey`))) AS `field3`,(/* select#4 */ select max(`sq2_alias1`.`pk`) AS `sq2_field1` from `t5` `sq2_alias1`) AS `field4`,`alias2`.`col_varchar_nokey` AS `field5`,`alias2`.`col_varchar_nokey` AS `field6` from `t4` `alias3` join ((/* select#5 */ select '0' AS `pk`,'7' AS `col_int_nokey`,'8' AS `col_int_key`,'2008-10-02' AS `col_date_key`,'2008-10-02' AS `col_date_nokey`,'04:07:22' AS `col_time_key`,'04:07:22' AS `col_time_nokey`,'2001-10-08 00:00:00' AS `col_datetime_key`,'2001-10-08 00:00:00' AS `col_datetime_nokey`,'g' AS `col_varchar_key`,'g' AS `col_varchar_nokey` from `t5` `sq3_alias1`)) `alias2` join `t5` `alias1` where (<in_optimizer>(`alias1`.`col_varchar_nokey`,<exists>(/* select#6 */ select `sq4_alias1`.`col_varchar_key` AS `sq4_field1` from (`t3` `sq4_alias1` join (`t3` `sq4_alias3` left join `t2` `sq4_alias2` on((`sq4_alias3`.`pk` = `sq4_alias2`.`col_int_key`))) on((`sq4_alias3`.`col_varchar_nokey` = `sq4_alias2`.`col_varchar_key`))) where ((`sq4_alias2`.`col_int_key` < `alias1`.`col_int_nokey`) and (`sq4_alias3`.`col_varchar_nokey` <> `alias1`.`col_varchar_key`) and (<cache>(`alias1`.`col_varchar_nokey`) = `sq4_alias1`.`col_varchar_key`)))) and (`alias1`.`col_int_key` <> 214) and (`alias3`.`col_int_key` = `alias2`.`pk`) and (`alias3`.`col_varchar_key` = `alias2`.`col_varchar_key`)) group by `field1`,`field2`,`field3`,`field4`,`field5`,`field6`"
            } /* transformations_to_nested_joins */
          },
          {
            "condition_processing": {
              "condition": "WHERE",
              "original_condition": "(<in_optimizer>(`alias1`.`col_varchar_nokey`,<exists>(/* select#6 */ select `sq4_alias1`.`col_varchar_key` AS `sq4_field1` from (`t3` `sq4_alias1` join (`t3` `sq4_alias3` left join `t2` `sq4_alias2` on((`sq4_alias3`.`pk` = `sq4_alias2`.`col_int_key`))) on((`sq4_alias3`.`col_varchar_nokey` = `sq4_alias2`.`col_varchar_key`))) where ((`sq4_alias2`.`col_int_key` < `alias1`.`col_int_nokey`) and (`sq4_alias3`.`col_varchar_nokey` <> `alias1`.`col_varchar_key`) and (<cache>(`alias1`.`col_varchar_nokey`) = `sq4_alias1`.`col_varchar_key`)))) and (`alias1`.`col_int_key` <> 214) and (`alias3`.`col_int_key` = `alias2`.`pk`) and (`alias3`.`col_varchar_key` = `alias2`.`col_varchar_key`))",
              "steps": [
                {
                  "transformation": "equality_propagation",
                  "subselect_evaluation": [
                  ] /* subselect_evaluation */,
                  "resulting_condition": "(<in_optimizer>(`alias1`.`col_varchar_nokey`,<exists>(/* select#6 */ select `sq4_alias1`.`col_varchar_key` AS `sq4_field1` from (`t3` `sq4_alias1` join (`t3` `sq4_alias3` left join `t2` `sq4_alias2` on((`sq4_alias3`.`pk` = `sq4_alias2`.`col_int_key`))) on((`sq4_alias3`.`col_varchar_nokey` = `sq4_alias2`.`col_varchar_key`))) where ((`sq4_alias2`.`col_int_key` < `alias1`.`col_int_nokey`) and (`sq4_alias3`.`col_varchar_nokey` <> `alias1`.`col_varchar_key`) and (<cache>(`alias1`.`col_varchar_nokey`) = `sq4_alias1`.`col_varchar_key`)))) and (`alias1`.`col_int_key` <> 214) and multiple equal(`alias3`.`col_int_key`, `alias2`.`pk`) and multiple equal(`alias3`.`col_varchar_key`, `alias2`.`col_varchar_key`))"
                },
                {
                  "transformation": "constant_propagation",
                  "subselect_evaluation": [
                  ] /* subselect_evaluation */,
                  "resulting_condition": "(<in_optimizer>(`alias1`.`col_varchar_nokey`,<exists>(/* select#6 */ select `sq4_alias1`.`col_varchar_key` AS `sq4_field1` from (`t3` `sq4_alias1` join (`t3` `sq4_alias3` left join `t2` `sq4_alias2` on((`sq4_alias3`.`pk` = `sq4_alias2`.`col_int_key`))) on((`sq4_alias3`.`col_varchar_nokey` = `sq4_alias2`.`col_varchar_key`))) where ((`sq4_alias2`.`col_int_key` < `alias1`.`col_int_nokey`) and (`sq4_alias3`.`col_varchar_nokey` <> `alias1`.`col_varchar_key`) and (<cache>(`alias1`.`col_varchar_nokey`) = `sq4_alias1`.`col_varchar_key`)))) and (`alias1`.`col_int_key` <> 214) and multiple equal(`alias3`.`col_int_key`, `alias2`.`pk`) and multiple equal(`alias3`.`col_varchar_key`, `alias2`.`col_varchar_key`))"
                },
                {
                  "transformation": "trivial_condition_removal",
                  "subselect_evaluation": [
                  ] /* subselect_evaluation */,
                  "resulting_condition": "(<in_optimizer>(`alias1`.`col_varchar_nokey`,<exists>(/* select#6 */ select `sq4_alias1`.`col_varchar_key` AS `sq4_field1` from (`t3` `sq4_alias1` join (`t3` `sq4_alias3` left join `t2` `sq4_alias2` on((`sq4_alias3`.`pk` = `sq4_alias2`.`col_int_key`))) on((`sq4_alias3`.`col_varchar_nokey` = `sq4_alias2`.`col_varchar_key`))) where ((`sq4_alias2`.`col_int_key` < `alias1`.`col_int_nokey`) and (`sq4_alias3`.`col_varchar_nokey` <> `alias1`.`col_varchar_key`) and (<cache>(`alias1`.`col_varchar_nokey`) = `sq4_alias1`.`col_varchar_key`)))) and (`alias1`.`col_int_key` <> 214) and multiple equal(`alias3`.`col_int_key`, `alias2`.`pk`) and multiple equal(`alias3`.`col_varchar_key`, `alias2`.`col_varchar_key`))"
                }
              ] /* steps */
            } /* condition_processing */
          },
          {
            "table_dependencies": [
              {
                "table": "`t5` `alias1`",
                "row_may_be_null": true,
                "map_bit": 0,
                "depends_on_map_bits": [
                ] /* depends_on_map_bits */
              },
              {
                "table": " `alias2`",
                "row_may_be_null": true,
                "map_bit": 1,
                "depends_on_map_bits": [
                ] /* depends_on_map_bits */
              },
              {
                "table": "`t4` `alias3`",
                "row_may_be_null": false,
                "map_bit": 2,
                "depends_on_map_bits": [
                ] /* depends_on_map_bits */
              }
            ] /* table_dependencies */
          },
          {
            "ref_optimizer_key_uses": [
              {
                "table": " `alias2`",
                "field": "pk",
                "equals": "`alias3`.`col_int_key`",
                "null_rejecting": true
              },
              {
                "table": " `alias2`",
                "field": "col_varchar_key",
                "equals": "`alias3`.`col_varchar_key`",
                "null_rejecting": true
              },
              {
                "table": " `alias2`",
                "field": "pk",
                "equals": "`alias3`.`col_int_key`",
                "null_rejecting": true
              },
              {
                "table": " `alias2`",
                "field": "col_varchar_key",
                "equals": "`alias3`.`col_varchar_key`",
                "null_rejecting": true
              },
              {
                "table": "`t4` `alias3`",
                "field": "col_varchar_key",
                "equals": "`alias2`.`col_varchar_key`",
                "null_rejecting": true
              },
              {
                "table": "`t4` `alias3`",
                "field": "col_int_key",
                "equals": "`alias2`.`pk`",
                "null_rejecting": true
              }
            ] /* ref_optimizer_key_uses */
          },
          {
            "rows_estimation": [
              {
                "table": "`t5` `alias1`",
                "range_analysis": {
                  "table_scan": {
                    "rows": 3,
                    "cost": 4.7342
                  } /* table_scan */,
                  "potential_range_indices": [
                    {
                      "index": "PRIMARY",
                      "usable": false,
                      "cause": "not_applicable"
                    },
                    {
                      "index": "col_int_key",
                      "usable": true,
                      "key_parts": [
                        "col_int_key"
                      ] /* key_parts */
                    },
                    {
                      "index": "col_varchar_key",
                      "usable": false,
                      "cause": "not_applicable"
                    }
                  ] /* potential_range_indices */,
                  "setup_range_conditions": [
                  ] /* setup_range_conditions */,
                  "group_index_range": {
                    "chosen": false,
                    "cause": "not_single_table"
                  } /* group_index_range */,
                  "analyzing_range_alternatives": {
                    "range_scan_alternatives": [
                      {
                        "index": "col_int_key",
                        "ranges": [
                          "NULL < col_int_key < 214",
                          "214 < col_int_key"
                        ] /* ranges */,
                        "index_dives_for_eq_ranges": true,
                        "rowid_ordered": false,
                        "using_mrr": false,
                        "index_only": false,
                        "rows": 3,
                        "cost": 5.61,
                        "chosen": false,
                        "cause": "cost"
                      }
                    ] /* range_scan_alternatives */,
                    "analyzing_roworder_intersect": {
                      "usable": false,
                      "cause": "too_few_roworder_scans"
                    } /* analyzing_roworder_intersect */
                  } /* analyzing_range_alternatives */
                } /* range_analysis */
              },
              {
                "table": " `alias2`"
              },
              {
                "table": "`t4` `alias3`",
                "rows": 1,
                "cost": 1,
                "table_type": "system",
                "empty": false
              }
            ] /* rows_estimation */
          },
          {
            "considered_execution_plans": [
              {
                "plan_prefix": [
                  "`t4` `alias3`"
                ] /* plan_prefix */,
                "table": "`t5` `alias1`",
                "best_access_path": {
                  "considered_access_paths": [
                    {
                      "access_type": "scan",
                      "rows": 3,
                      "cost": 2.6342,
                      "chosen": true
                    }
                  ] /* considered_access_paths */
                } /* best_access_path */,
                "cost_for_plan": 2.6342,
                "rows_for_plan": 3,
                "rest_of_plan": [
                  {
                    "plan_prefix": [
                      "`t4` `alias3`",
                      "`t5` `alias1`"
                    ] /* plan_prefix */,
                    "table": " `alias2`",
                    "best_access_path": {
                      "considered_access_paths": [
                        {
                          "access_type": "ref",
                          "index": "<auto_key0>",
                          "rows": 0.3,
                          "cost": 0.96,
                          "chosen": true
                        },
                        {
                          "access_type": "ref",
                          "index": "<auto_key1>",
                          "rows": 0.3,
                          "cost": 0.96,
                          "chosen": false
                        },
                        {
                          "access_type": "scan",
                          "cost": 10.6,
                          "rows": 3,
                          "cause": "cost",
                          "chosen": false
                        }
                      ] /* considered_access_paths */
                    } /* best_access_path */,
                    "cost_for_plan": 3.7142,
                    "rows_for_plan": 0.9,
                    "chosen": true
                  }
                ] /* rest_of_plan */
              },
              {
                "plan_prefix": [
                  "`t4` `alias3`"
                ] /* plan_prefix */,
                "table": " `alias2`",
                "best_access_path": {
                  "considered_access_paths": [
                    {
                      "access_type": "ref",
                      "index": "<auto_key0>",
                      "rows": 0.3,
                      "cost": 0.36,
                      "chosen": true
                    },
                    {
                      "access_type": "ref",
                      "index": "<auto_key1>",
                      "rows": 0.3,
                      "cost": 0.36,
                      "chosen": false
                    },
                    {
                      "access_type": "scan",
                      "cost": 10.6,
                      "rows": 3,
                      "cause": "cost",
                      "chosen": false
                    }
                  ] /* considered_access_paths */
                } /* best_access_path */,
                "cost_for_plan": 0.36,
                "rows_for_plan": 0.3,
                "rest_of_plan": [
                  {
                    "plan_prefix": [
                      "`t4` `alias3`",
                      " `alias2`"
                    ] /* plan_prefix */,
                    "table": "`t5` `alias1`",
                    "best_access_path": {
                      "considered_access_paths": [
                        {
                          "access_type": "scan",
                          "using_join_cache": true,
                          "rows": 3,
                          "cost": 2.2143,
                          "chosen": true
                        }
                      ] /* considered_access_paths */
                    } /* best_access_path */,
                    "cost_for_plan": 2.5743,
                    "rows_for_plan": 0.9,
                    "chosen": true
                  }
                ] /* rest_of_plan */
              }
            ] /* considered_execution_plans */
          },
          {
            "attaching_conditions_to_tables": {
              "original_condition": "((`alias2`.`col_varchar_key` = 'g') and (`alias2`.`pk` = '8') and <in_optimizer>(`alias1`.`col_varchar_nokey`,<exists>(/* select#6 */ select `sq4_alias1`.`col_varchar_key` AS `sq4_field1` from (`t3` `sq4_alias1` join (`t3` `sq4_alias3` left join `t2` `sq4_alias2` on((`sq4_alias3`.`pk` = `sq4_alias2`.`col_int_key`))) on((`sq4_alias3`.`col_varchar_nokey` = `sq4_alias2`.`col_varchar_key`))) where ((`sq4_alias2`.`col_int_key` < `alias1`.`col_int_nokey`) and (`sq4_alias3`.`col_varchar_nokey` <> `alias1`.`col_varchar_key`) and (<cache>(`alias1`.`col_varchar_nokey`) = `sq4_alias1`.`col_varchar_key`)))) and (`alias1`.`col_int_key` <> 214))",
              "attached_conditions_computation": [
              ] /* attached_conditions_computation */,
              "attached_conditions_summary": [
                {
                  "table": " `alias2`",
                  "attached": null
                },
                {
                  "table": "`t5` `alias1`",
                  "attached": "(<in_optimizer>(`alias1`.`col_varchar_nokey`,<exists>(/* select#6 */ select `sq4_alias1`.`col_varchar_key` AS `sq4_field1` from (`t3` `sq4_alias1` join (`t3` `sq4_alias3` left join `t2` `sq4_alias2` on((`sq4_alias3`.`pk` = `sq4_alias2`.`col_int_key`))) on((`sq4_alias3`.`col_varchar_nokey` = `sq4_alias2`.`col_varchar_key`))) where ((`sq4_alias2`.`col_int_key` < `alias1`.`col_int_nokey`) and (`sq4_alias3`.`col_varchar_nokey` <> `alias1`.`col_varchar_key`) and (<cache>(`alias1`.`col_varchar_nokey`) = `sq4_alias1`.`col_varchar_key`)))) and (`alias1`.`col_int_key` <> 214))"
                }
              ] /* attached_conditions_summary */
            } /* attaching_conditions_to_tables */
          },
          {
            "clause_processing": {
              "clause": "GROUP BY",
              "original_clause": "`field1`,`field2`,`field3`,`field4`,`field5`,`field6`",
              "items": [
                {
                  "item": "`alias1`.`col_varchar_key`"
                },
                {
                  "item": "`alias1`.`col_date_key`"
                },
                {
                  "item": "(/* select#2 */ select min(`sq1_alias1`.`col_varchar_nokey`) AS `sq1_field1` from (`t1` `sq1_alias1` join (`t5` `sq1_alias2` left join `t5` `sq1_alias3` on((`sq1_alias3`.`col_varchar_nokey` = `sq1_alias2`.`col_varchar_key`))) on((`sq1_alias3`.`col_varchar_nokey` = `sq1_alias2`.`col_varchar_key`))) where exists(/* select#3 */ select `c_sq1_alias2`.`col_int_nokey` AS `c_sq1_field1` from (`t4` `c_sq1_alias2` left join `t3` `c_sq1_alias1` on((`c_sq1_alias2`.`col_int_nokey` = `c_sq1_alias1`.`pk`))) where (`c_sq1_alias2`.`col_varchar_key` = `sq1_alias2`.`col_varchar_nokey`)))",
                  "subselect_evaluation": [
                    {
                      "subselect_execution": {
                        "select#": 2,
                        "steps": [
                          {
                            "join_optimization": {
                              "select#": 2,
                              "steps": [
                                {
                                  "transformations_to_nested_joins": {
                                    "transformations": [
                                      "outer_join_to_inner_join",
                                      "JOIN_condition_to_WHERE",
                                      "parenthesis_removal"
                                    ] /* transformations */,
                                    "expanded_query": "/* select#2 */ select min(`sq1_alias1`.`col_varchar_nokey`) AS `sq1_field1` from `t1` `sq1_alias1` join `t5` `sq1_alias2` join `t5` `sq1_alias3` where (exists(/* select#3 */ select `c_sq1_alias2`.`col_int_nokey` AS `c_sq1_field1` from (`t4` `c_sq1_alias2` left join `t3` `c_sq1_alias1` on((`c_sq1_alias2`.`col_int_nokey` = `c_sq1_alias1`.`pk`))) where (`c_sq1_alias2`.`col_varchar_key` = `sq1_alias2`.`col_varchar_nokey`)) and (`sq1_alias3`.`col_varchar_nokey` = `sq1_alias2`.`col_varchar_key`) and (`sq1_alias3`.`col_varchar_nokey` = `sq1_alias2`.`col_varchar_key`))"
                                  } /* transformations_to_nested_joins */
                                },
                                {
                                  "condition_processing": {
                                    "condition": "WHERE",
                                    "original_condition": "(exists(/* select#3 */ select `c_sq1_alias2`.`col_int_nokey` AS `c_sq1_field1` from (`t4` `c_sq1_alias2` left join `t3` `c_sq1_alias1` on((`c_sq1_alias2`.`col_int_nokey` = `c_sq1_alias1`.`pk`))) where (`c_sq1_alias2`.`col_varchar_key` = `sq1_alias2`.`col_varchar_nokey`)) and (`sq1_alias3`.`col_varchar_nokey` = `sq1_alias2`.`col_varchar_key`) and (`sq1_alias3`.`col_varchar_nokey` = `sq1_alias2`.`col_varchar_key`))",
                                    "steps": [
                                      {
                                        "transformation": "equality_propagation",
                                        "subselect_evaluation": [
                                        ] /* subselect_evaluation */,
                                        "resulting_condition": "(exists(/* select#3 */ select `c_sq1_alias2`.`col_int_nokey` AS `c_sq1_field1` from (`t4` `c_sq1_alias2` left join `t3` `c_sq1_alias1` on((`c_sq1_alias2`.`col_int_nokey` = `c_sq1_alias1`.`pk`))) where (`c_sq1_alias2`.`col_varchar_key` = `sq1_alias2`.`col_varchar_nokey`)) and multiple equal(`sq1_alias3`.`col_varchar_nokey`, `sq1_alias2`.`col_varchar_key`))"
                                      },
                                      {
                                        "transformation": "constant_propagation",
                                        "subselect_evaluation": [
                                        ] /* subselect_evaluation */,
                                        "resulting_condition": "(exists(/* select#3 */ select `c_sq1_alias2`.`col_int_nokey` AS `c_sq1_field1` from (`t4` `c_sq1_alias2` left join `t3` `c_sq1_alias1` on((`c_sq1_alias2`.`col_int_nokey` = `c_sq1_alias1`.`pk`))) where (`c_sq1_alias2`.`col_varchar_key` = `sq1_alias2`.`col_varchar_nokey`)) and multiple equal(`sq1_alias3`.`col_varchar_nokey`, `sq1_alias2`.`col_varchar_key`))"
                                      },
                                      {
                                        "transformation": "trivial_condition_removal",
                                        "subselect_evaluation": [
                                        ] /* subselect_evaluation */,
                                        "resulting_condition": "(exists(/* select#3 */ select `c_sq1_alias2`.`col_int_nokey` AS `c_sq1_field1` from (`t4` `c_sq1_alias2` left join `t3` `c_sq1_alias1` on((`c_sq1_alias2`.`col_int_nokey` = `c_sq1_alias1`.`pk`))) where (`c_sq1_alias2`.`col_varchar_key` = `sq1_alias2`.`col_varchar_nokey`)) and multiple equal(`sq1_alias3`.`col_varchar_nokey`, `sq1_alias2`.`col_varchar_key`))"
                                      }
                                    ] /* steps */
                                  } /* condition_processing */
                                },
                                {
                                  "table_dependencies": [
                                    {
                                      "table": "`t1` `sq1_alias1`",
                                      "row_may_be_null": false,
                                      "map_bit": 0,
                                      "depends_on_map_bits": [
                                      ] /* depends_on_map_bits */
                                    },
                                    {
                                      "table": "`t5` `sq1_alias2`",
                                      "row_may_be_null": false,
                                      "map_bit": 1,
                                      "depends_on_map_bits": [
                                      ] /* depends_on_map_bits */
                                    },
                                    {
                                      "table": "`t5` `sq1_alias3`",
                                      "row_may_be_null": true,
                                      "map_bit": 2,
                                      "depends_on_map_bits": [
                                      ] /* depends_on_map_bits */
                                    }
                                  ] /* table_dependencies */
                                },
                                {
                                  "ref_optimizer_key_uses": [
                                    {
                                      "table": "`t5` `sq1_alias2`",
                                      "field": "col_varchar_key",
                                      "equals": "`sq1_alias3`.`col_varchar_nokey`",
                                      "null_rejecting": true
                                    }
                                  ] /* ref_optimizer_key_uses */
                                },
                                {
                                  "rows_estimation": [
                                    {
                                      "table": "`t1` `sq1_alias1`",
                                      "rows": 1,
                                      "cost": 1,
                                      "table_type": "system",
                                      "empty": true
                                    },
                                    {
                                      "table": "`t5` `sq1_alias2`",
                                      "table_scan": {
                                        "rows": 3,
                                        "cost": 2
                                      } /* table_scan */
                                    },
                                    {
                                      "table": "`t5` `sq1_alias3`",
                                      "table_scan": {
                                        "rows": 3,
                                        "cost": 2
                                      } /* table_scan */
                                    }
                                  ] /* rows_estimation */
                                },
                                {
                                  "considered_execution_plans": [
                                    {
                                      "plan_prefix": [
                                        "`t1` `sq1_alias1`"
                                      ] /* plan_prefix */,
                                      "table": "`t5` `sq1_alias3`",
                                      "best_access_path": {
                                        "considered_access_paths": [
                                          {
                                            "access_type": "scan",
                                            "rows": 3,
                                            "cost": 2.6342,
                                            "chosen": true
                                          }
                                        ] /* considered_access_paths */
                                      } /* best_access_path */,
                                      "cost_for_plan": 2.6342,
                                      "rows_for_plan": 3,
                                      "rest_of_plan": [
                                        {
                                          "plan_prefix": [
                                            "`t1` `sq1_alias1`",
                                            "`t5` `sq1_alias3`"
                                          ] /* plan_prefix */,
                                          "table": "`t5` `sq1_alias2`",
                                          "best_access_path": {
                                            "considered_access_paths": [
                                              {
                                                "access_type": "ref",
                                                "index": "col_varchar_key",
                                                "rows": 1,
                                                "cost": 4.1,
                                                "chosen": true
                                              },
                                              {
                                                "access_type": "scan",
                                                "using_join_cache": true,
                                                "rows": 3,
                                                "cost": 3.8343,
                                                "chosen": true
                                              }
                                            ] /* considered_access_paths */
                                          } /* best_access_path */,
                                          "cost_for_plan": 6.4685,
                                          "rows_for_plan": 9,
                                          "chosen": true
                                        }
                                      ] /* rest_of_plan */
                                    },
                                    {
                                      "plan_prefix": [
                                        "`t1` `sq1_alias1`"
                                      ] /* plan_prefix */,
                                      "table": "`t5` `sq1_alias2`",
                                      "best_access_path": {
                                        "considered_access_paths": [
                                          {
                                            "access_type": "ref",
                                            "index": "col_varchar_key",
                                            "usable": false,
                                            "chosen": false
                                          },
                                          {
                                            "access_type": "scan",
                                            "rows": 3,
                                            "cost": 2.6342,
                                            "chosen": true
                                          }
                                        ] /* considered_access_paths */
                                      } /* best_access_path */,
                                      "cost_for_plan": 2.6342,
                                      "rows_for_plan": 3,
                                      "pruned_by_heuristic": true
                                    }
                                  ] /* considered_execution_plans */
                                }
                              ] /* steps */,
                              "empty_result": {
                                "cause": "no matching row in const table"
                              } /* empty_result */
                            } /* join_optimization */
                          },
                          {
                            "join_execution": {
                              "select#": 2,
                              "steps": [
                              ] /* steps */
                            } /* join_execution */
                          }
                        ] /* steps */
                      } /* subselect_execution */
                    }
                  ] /* subselect_evaluation */,
                  "uses_only_constant_tables": true
                },
                {
                  "item": "(/* select#4 */ select max(`sq2_alias1`.`pk`) AS `sq2_field1` from `t5` `sq2_alias1`)",
                  "subselect_evaluation": [
                    {
                      "subselect_execution": {
                        "select#": 4,
                        "steps": [
                          {
                            "join_optimization": {
                              "select#": 4,
                              "steps": [
                              ] /* steps */,
                              "empty_result": {
                                "cause": "Select tables optimized away"
                              } /* empty_result */
                            } /* join_optimization */
                          },
                          {
                            "join_execution": {
                              "select#": 4,
                              "steps": [
                              ] /* steps */
                            } /* join_execution */
                          }
                        ] /* steps */
                      } /* subselect_execution */
                    }
                  ] /* subselect_evaluation */,
                  "uses_only_constant_tables": true
                },
                {
                  "item": "`alias2`.`col_varchar_nokey`"
                },
                {
                  "item": "`alias2`.`col_varchar_nokey`",
                  "duplicate_item": true
                }
              ] /* items */,
              "resulting_clause_is_simple": false,
              "resulting_clause": "`field1`,`field2`,`field5`"
            } /* clause_processing */
          },
          {
            "refine_plan": [
              {
                "table": " `alias2`"
              },
              {
                "table": "`t5` `alias1`",
                "access_type": "table_scan"
              }
            ] /* refine_plan */
          }
        ] /* steps */
      } /* join_optimization */
    },
    {
      "join_execution": {
        "select#": 1,
        "steps": [
          {
            "creating_tmp_table": {
              "tmp_table_info": {
                "table": " `alias2`",
                "row_length": 40,
                "key_length": 8,
                "unique_constraint": false,
                "location": "memory (heap)",
                "row_limit_estimate": 26214
              } /* tmp_table_info */
            } /* creating_tmp_table */
          },
          {
            "join_execution": {
              "select#": 5,
              "steps": [
              ] /* steps */
            } /* join_execution */
          },
          {
            "creating_tmp_table": {
              "tmp_table_info": {
                "table": "intermediate_tmp_table",
                "row_length": 13,
                "key_length": 12,
                "unique_constraint": false,
                "location": "memory (heap)",
                "row_limit_estimate": 80659
              } /* tmp_table_info */
            } /* creating_tmp_table */
          },
          {
            "filesort_information": [
              {
                "direction": "asc",
                "table": "intermediate_tmp_table",
                "field": "col_varchar_key"
              },
              {
                "direction": "asc",
                "table": "intermediate_tmp_table",
                "field": "col_date_key"
              },
              {
                "direction": "asc",
                "table": "intermediate_tmp_table",
                "field": "col_varchar_nokey"
              }
            ] /* filesort_information */,
            "filesort_priority_queue_optimization": {
              "usable": false,
              "cause": "not applicable (no LIMIT)"
            } /* filesort_priority_queue_optimization */,
            "filesort_execution": [
            ] /* filesort_execution */,
            "filesort_summary": {
              "rows": 0,
              "examined_rows": 0,
              "number_of_tmp_files": 0,
              "sort_buffer_size": "NNN",
              "sort_mode": "<sort_key, rowid>"
            } /* filesort_summary */
          }
        ] /* steps */
      } /* join_execution */
    }
  ] /* steps */
}	0	0
set optimizer_switch=@old_opt_switch;
drop table t1,t2,t3,t4,t5;
#
# BUG#12905758 - ASSERT IN OPT_TRACE_STMT::SYNTAX_ERROR ON
# SELECT/SUBQ/SUM QUERY
#
CREATE TABLE t1 (
pk INTEGER AUTO_INCREMENT,
col_int_nokey INTEGER,
col_int_key INTEGER,
col_date_key DATE,
col_date_nokey DATE,
col_time_key TIME,
col_time_nokey TIME,
col_datetime_key DATETIME,
col_datetime_nokey DATETIME,
col_varchar_key VARCHAR(1),
col_varchar_nokey VARCHAR(1),
PRIMARY KEY (pk),
KEY (col_varchar_key,col_int_key)
) ENGINE=MYISAM;
INSERT INTO t1 (
col_int_key,col_int_nokey,
col_date_key,col_date_nokey,
col_time_key,col_time_nokey,
col_datetime_key,col_datetime_nokey,
col_varchar_key,col_varchar_nokey
) VALUES
(8,NULL,'2000-12-03','2000-12-03','22:55:23.019225','22:55:23.019225','2005-07-20 00:00:00','2005-07-20 00:00:00','x','x'),
(8,6,'2000-09-20','2000-09-20','14:11:27.044095','14:11:27.044095','2003-06-13 23:19:49.018300','2003-06-13 23:19:49.018300','c','c');
CREATE TABLE t2 (I INTEGER);
select ( select sum( subquery1_t1.`col_int_nokey` ) as subquery1_field1 from
t1 as subquery1_t1 ) as field1 from ( t1 as table1 straight_join t1 as table2
on (table2.`col_varchar_key` = table1.`col_varchar_key` ) ) where (
table2.`col_int_nokey` <> any ( select 5 from t2 ) ) and table1.`pk` in
(192,18) order by field1 desc;
field1
select * from information_schema.optimizer_trace;
QUERY	TRACE	MISSING_BYTES_BEYOND_MAX_MEM_SIZE	INSUFFICIENT_PRIVILEGES
select ( select sum( subquery1_t1.`col_int_nokey` ) as subquery1_field1 from
t1 as subquery1_t1 ) as field1 from ( t1 as table1 straight_join t1 as table2
on (table2.`col_varchar_key` = table1.`col_varchar_key` ) ) where (
table2.`col_int_nokey` <> any ( select 5 from t2 ) ) and table1.`pk` in
(192,18) order by field1 desc	{
  "steps": [
    {
      "join_preparation": {
        "select#": 1,
        "steps": [
          {
            "join_preparation": {
              "select#": 2,
              "steps": [
                {
                  "expanded_query": "/* select#2 */ select sum(`subquery1_t1`.`col_int_nokey`) AS `subquery1_field1` from `t1` `subquery1_t1`"
                }
              ] /* steps */
            } /* join_preparation */
          },
          {
            "join_preparation": {
              "select#": 3,
              "steps": [
                {
                  "expanded_query": "/* select#3 */ select 5 from `t2` where <if>(outer_field_is_not_null, (<cache>(`table2`.`col_int_nokey`) <> 5), true)"
                }
              ] /* steps */
            } /* join_preparation */
          },
          {
            "expanded_query": "/* select#1 */ select (/* select#2 */ select sum(`subquery1_t1`.`col_int_nokey`) AS `subquery1_field1` from `t1` `subquery1_t1`) AS `field1` from (`t1` `table1` straight_join `t1` `table2` on((`table2`.`col_varchar_key` = `table1`.`col_varchar_key`))) where (<nop>(<in_optimizer>(`table2`.`col_int_nokey`,<exists>(/* select#3 */ select 5 from `t2` where <if>(outer_field_is_not_null, (<cache>(`table2`.`col_int_nokey`) <> 5), true)))) and (`table1`.`pk` in (192,18))) order by `field1` desc"
          }
        ] /* steps */
      } /* join_preparation */
    },
    {
      "join_optimization": {
        "select#": 1,
        "steps": [
          {
            "transformations_to_nested_joins": {
              "transformations": [
                "JOIN_condition_to_WHERE",
                "parenthesis_removal"
              ] /* transformations */,
              "expanded_query": "/* select#1 */ select (/* select#2 */ select sum(`subquery1_t1`.`col_int_nokey`) AS `subquery1_field1` from `t1` `subquery1_t1`) AS `field1` from `t1` `table1` straight_join `t1` `table2` where (<nop>(<in_optimizer>(`table2`.`col_int_nokey`,<exists>(/* select#3 */ select 5 from `t2` where <if>(outer_field_is_not_null, (<cache>(`table2`.`col_int_nokey`) <> 5), true)))) and (`table1`.`pk` in (192,18)) and (`table2`.`col_varchar_key` = `table1`.`col_varchar_key`)) order by `field1` desc"
            } /* transformations_to_nested_joins */
          },
          {
            "condition_processing": {
              "condition": "WHERE",
              "original_condition": "(<nop>(<in_optimizer>(`table2`.`col_int_nokey`,<exists>(/* select#3 */ select 5 from `t2` where <if>(outer_field_is_not_null, (<cache>(`table2`.`col_int_nokey`) <> 5), true)))) and (`table1`.`pk` in (192,18)) and (`table2`.`col_varchar_key` = `table1`.`col_varchar_key`))",
              "steps": [
                {
                  "transformation": "equality_propagation",
                  "subselect_evaluation": [
                  ] /* subselect_evaluation */,
                  "resulting_condition": "(<nop>(<in_optimizer>(`table2`.`col_int_nokey`,<exists>(/* select#3 */ select 5 from `t2` where <if>(outer_field_is_not_null, (<cache>(`table2`.`col_int_nokey`) <> 5), true)))) and (`table1`.`pk` in (192,18)) and multiple equal(`table2`.`col_varchar_key`, `table1`.`col_varchar_key`))"
                },
                {
                  "transformation": "constant_propagation",
                  "subselect_evaluation": [
                  ] /* subselect_evaluation */,
                  "resulting_condition": "(<nop>(<in_optimizer>(`table2`.`col_int_nokey`,<exists>(/* select#3 */ select 5 from `t2` where <if>(outer_field_is_not_null, (<cache>(`table2`.`col_int_nokey`) <> 5), true)))) and (`table1`.`pk` in (192,18)) and multiple equal(`table2`.`col_varchar_key`, `table1`.`col_varchar_key`))"
                },
                {
                  "transformation": "trivial_condition_removal",
                  "subselect_evaluation": [
                  ] /* subselect_evaluation */,
                  "resulting_condition": "(<nop>(<in_optimizer>(`table2`.`col_int_nokey`,<exists>(/* select#3 */ select 5 from `t2` where <if>(outer_field_is_not_null, (<cache>(`table2`.`col_int_nokey`) <> 5), true)))) and (`table1`.`pk` in (192,18)) and multiple equal(`table2`.`col_varchar_key`, `table1`.`col_varchar_key`))"
                }
              ] /* steps */
            } /* condition_processing */
          },
          {
            "table_dependencies": [
              {
                "table": "`t1` `table1`",
                "row_may_be_null": false,
                "map_bit": 0,
                "depends_on_map_bits": [
                ] /* depends_on_map_bits */
              },
              {
                "table": "`t1` `table2`",
                "row_may_be_null": false,
                "map_bit": 1,
                "depends_on_map_bits": [
                  0
                ] /* depends_on_map_bits */
              }
            ] /* table_dependencies */
          },
          {
            "ref_optimizer_key_uses": [
              {
                "table": "`t1` `table1`",
                "field": "col_varchar_key",
                "equals": "`table2`.`col_varchar_key`",
                "null_rejecting": true
              },
              {
                "table": "`t1` `table2`",
                "field": "col_varchar_key",
                "equals": "`table1`.`col_varchar_key`",
                "null_rejecting": true
              }
            ] /* ref_optimizer_key_uses */
          },
          {
            "rows_estimation": [
              {
                "table": "`t1` `table1`",
                "range_analysis": {
                  "table_scan": {
                    "rows": 2,
                    "cost": 4.5225
                  } /* table_scan */,
                  "potential_range_indices": [
                    {
                      "index": "PRIMARY",
                      "usable": true,
                      "key_parts": [
                        "pk"
                      ] /* key_parts */
                    },
                    {
                      "index": "col_varchar_key",
                      "usable": false,
                      "cause": "not_applicable"
                    }
                  ] /* potential_range_indices */,
                  "setup_range_conditions": [
                  ] /* setup_range_conditions */,
                  "group_index_range": {
                    "chosen": false,
                    "cause": "not_single_table"
                  } /* group_index_range */,
                  "analyzing_range_alternatives": {
                    "range_scan_alternatives": [
                      {
                        "index": "PRIMARY",
                        "ranges": [
                          "18 <= pk <= 18",
                          "192 <= pk <= 192"
                        ] /* ranges */,
                        "index_dives_for_eq_ranges": true,
                        "rowid_ordered": false,
                        "using_mrr": false,
                        "index_only": false,
                        "rows": 2,
                        "cost": 4.41,
                        "chosen": true
                      }
                    ] /* range_scan_alternatives */,
                    "analyzing_roworder_intersect": {
                      "usable": false,
                      "cause": "too_few_roworder_scans"
                    } /* analyzing_roworder_intersect */
                  } /* analyzing_range_alternatives */,
                  "chosen_range_access_summary": {
                    "range_access_plan": {
                      "type": "range_scan",
                      "index": "PRIMARY",
                      "rows": 2,
                      "ranges": [
                        "18 <= pk <= 18",
                        "192 <= pk <= 192"
                      ] /* ranges */
                    } /* range_access_plan */,
                    "rows_for_plan": 2,
                    "cost_for_plan": 4.41,
                    "chosen": true
                  } /* chosen_range_access_summary */
                } /* range_analysis */
              },
              {
                "table": "`t1` `table2`",
                "table_scan": {
                  "rows": 2,
                  "cost": 2
                } /* table_scan */
              }
            ] /* rows_estimation */
          },
          {
            "considered_execution_plans": [
              {
                "plan_prefix": [
                ] /* plan_prefix */,
                "table": "`t1` `table1`",
                "best_access_path": {
                  "considered_access_paths": [
                    {
                      "access_type": "ref",
                      "index": "col_varchar_key",
                      "usable": false,
                      "chosen": false
                    },
                    {
                      "access_type": "range",
                      "rows": 2,
                      "cost": 4.81,
                      "chosen": true
                    }
                  ] /* considered_access_paths */
                } /* best_access_path */,
                "cost_for_plan": 4.81,
                "rows_for_plan": 2,
                "rest_of_plan": [
                  {
                    "plan_prefix": [
                      "`t1` `table1`"
                    ] /* plan_prefix */,
                    "table": "`t1` `table2`",
                    "best_access_path": {
                      "considered_access_paths": [
                        {
                          "access_type": "ref",
                          "index": "col_varchar_key",
                          "rows": 1,
                          "cost": 2.6,
                          "chosen": true
                        },
                        {
                          "access_type": "scan",
                          "using_join_cache": true,
                          "rows": 2,
                          "cost": 2.8226,
                          "chosen": false
                        }
                      ] /* considered_access_paths */
                    } /* best_access_path */,
                    "cost_for_plan": 7.61,
                    "rows_for_plan": 2,
                    "chosen": true
                  }
                ] /* rest_of_plan */
              }
            ] /* considered_execution_plans */
          },
          {
            "attaching_conditions_to_tables": {
              "original_condition": "((`table2`.`col_varchar_key` = `table1`.`col_varchar_key`) and <nop>(<in_optimizer>(`table2`.`col_int_nokey`,<exists>(/* select#3 */ select 5 from `t2` where <if>(outer_field_is_not_null, (<cache>(`table2`.`col_int_nokey`) <> 5), true)))) and (`table1`.`pk` in (192,18)))",
              "attached_conditions_computation": [
              ] /* attached_conditions_computation */,
              "attached_conditions_summary": [
                {
                  "table": "`t1` `table1`",
                  "attached": "((`table1`.`pk` in (192,18)) and (`table1`.`col_varchar_key` is not null))"
                },
                {
                  "table": "`t1` `table2`",
                  "attached": "<nop>(<in_optimizer>(`table2`.`col_int_nokey`,<exists>(/* select#3 */ select 5 from `t2` where <if>(outer_field_is_not_null, (<cache>(`table2`.`col_int_nokey`) <> 5), true))))"
                }
              ] /* attached_conditions_summary */
            } /* attaching_conditions_to_tables */
          },
          {
            "clause_processing": {
              "clause": "ORDER BY",
              "original_clause": "`field1` desc",
              "items": [
                {
                  "item": "(/* select#2 */ select sum(`subquery1_t1`.`col_int_nokey`) AS `subquery1_field1` from `t1` `subquery1_t1`)",
                  "subselect_evaluation": [
                    {
                      "subselect_execution": {
                        "select#": 2,
                        "steps": [
                          {
                            "join_optimization": {
                              "select#": 2,
                              "steps": [
                                {
                                  "table_dependencies": [
                                    {
                                      "table": "`t1` `subquery1_t1`",
                                      "row_may_be_null": false,
                                      "map_bit": 0,
                                      "depends_on_map_bits": [
                                      ] /* depends_on_map_bits */
                                    }
                                  ] /* table_dependencies */
                                },
                                {
                                  "rows_estimation": [
                                    {
                                      "table": "`t1` `subquery1_t1`",
                                      "table_scan": {
                                        "rows": 2,
                                        "cost": 2
                                      } /* table_scan */
                                    }
                                  ] /* rows_estimation */
                                },
                                {
                                  "considered_execution_plans": [
                                    {
                                      "plan_prefix": [
                                      ] /* plan_prefix */,
                                      "table": "`t1` `subquery1_t1`",
                                      "best_access_path": {
                                        "considered_access_paths": [
                                          {
                                            "access_type": "scan",
                                            "rows": 2,
                                            "cost": 2.4225,
                                            "chosen": true
                                          }
                                        ] /* considered_access_paths */
                                      } /* best_access_path */,
                                      "cost_for_plan": 2.4225,
                                      "rows_for_plan": 2,
                                      "chosen": true
                                    }
                                  ] /* considered_execution_plans */
                                },
                                {
                                  "attaching_conditions_to_tables": {
                                    "original_condition": null,
                                    "attached_conditions_computation": [
                                    ] /* attached_conditions_computation */,
                                    "attached_conditions_summary": [
                                      {
                                        "table": "`t1` `subquery1_t1`",
                                        "attached": null
                                      }
                                    ] /* attached_conditions_summary */
                                  } /* attaching_conditions_to_tables */
                                },
                                {
                                  "refine_plan": [
                                    {
                                      "table": "`t1` `subquery1_t1`",
                                      "access_type": "table_scan"
                                    }
                                  ] /* refine_plan */
                                }
                              ] /* steps */
                            } /* join_optimization */
                          },
                          {
                            "join_execution": {
                              "select#": 2,
                              "steps": [
                              ] /* steps */
                            } /* join_execution */
                          }
                        ] /* steps */
                      } /* subselect_execution */
                    }
                  ] /* subselect_evaluation */,
                  "uses_only_constant_tables": true
                }
              ] /* items */,
              "resulting_clause_is_simple": true,
              "resulting_clause": ""
            } /* clause_processing */
          },
          {
            "refine_plan": [
              {
                "table": "`t1` `table1`",
                "pushed_index_condition": "(`table1`.`pk` in (192,18))",
                "table_condition_attached": "(`table1`.`col_varchar_key` is not null)",
                "access_type": "range"
              },
              {
                "table": "`t1` `table2`"
              }
            ] /* refine_plan */
          }
        ] /* steps */
      } /* join_optimization */
    },
    {
      "join_execution": {
        "select#": 1,
        "steps": [
        ] /* steps */
      } /* join_execution */
    }
  ] /* steps */
}	0	0
drop table t1,t2;
