set @@join_buffer_size=256*1024;
set @save_optimizer_switch=@@optimizer_switch;
create table t1 (a int, b int);
create table t2 (c int, d int);
insert into t1 values (1,1),(2,2);
insert into t2 values (2,2),(3,3);
(select a,b from t1) intersect (select c,d from t2);
a	b
2	2
drop tables t1,t2;
create table t1 (a int, b int) engine=MyISAM;
create table t2 (c int, d int) engine=MyISAM;
create table t3 (e int, f int) engine=MyISAM;
insert into t1 values (1,1),(2,2),(3,3);
insert into t2 values (2,2),(3,3),(4,4);
insert into t3 values (1,1),(2,2),(5,5);
(select a,b from t1) intersect (select c,d from t2) intersect (select e,f from t3);
a	b
2	2
EXPLAIN (select a,b from t1) intersect (select c,d from t2) intersect (select e,f from t3);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	
2	INTERSECT	t2	ALL	NULL	NULL	NULL	NULL	3	
3	INTERSECT	t3	ALL	NULL	NULL	NULL	NULL	3	
NULL	INTERSECT RESULT	<intersect1,2,3>	ALL	NULL	NULL	NULL	NULL	NULL	
EXPLAIN extended (select a,b from t1) intersect (select c,d from t2) intersect (select e,f from t3);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	
2	INTERSECT	t2	ALL	NULL	NULL	NULL	NULL	3	100.00	
3	INTERSECT	t3	ALL	NULL	NULL	NULL	NULL	3	100.00	
NULL	INTERSECT RESULT	<intersect1,2,3>	ALL	NULL	NULL	NULL	NULL	NULL	NULL	
Warnings:
Note	1003	(/* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1`) intersect (/* select#2 */ select `test`.`t2`.`c` AS `c`,`test`.`t2`.`d` AS `d` from `test`.`t2`) intersect (/* select#3 */ select `test`.`t3`.`e` AS `e`,`test`.`t3`.`f` AS `f` from `test`.`t3`)
EXPLAIN extended select * from ((select a,b from t1) intersect (select c,d from t2) intersect (select e,f from t3)) a;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	3	100.00	
2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	
3	INTERSECT	t2	ALL	NULL	NULL	NULL	NULL	3	100.00	
4	INTERSECT	t3	ALL	NULL	NULL	NULL	NULL	3	100.00	
NULL	INTERSECT RESULT	<intersect2,3,4>	ALL	NULL	NULL	NULL	NULL	NULL	NULL	
Warnings:
Note	1003	/* select#1 */ select `a`.`a` AS `a`,`a`.`b` AS `b` from ((/* select#2 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1`) intersect (/* select#3 */ select `test`.`t2`.`c` AS `c`,`test`.`t2`.`d` AS `d` from `test`.`t2`) intersect (/* select#4 */ select `test`.`t3`.`e` AS `e`,`test`.`t3`.`f` AS `f` from `test`.`t3`)) `a`
EXPLAIN format=json (select a,b from t1) intersect (select c,d from t2) intersect (select e,f from t3);
EXPLAIN
{
  "query_block": {
    "union_result": {
      "table_name": "<intersect1,2,3>",
      "access_type": "ALL",
      "query_specifications": [
        {
          "query_block": {
            "select_id": 1,
            "cost": "COST_REPLACED",
            "nested_loop": [
              {
                "table": {
                  "table_name": "t1",
                  "access_type": "ALL",
                  "loops": 1,
                  "rows": 3,
                  "cost": "COST_REPLACED",
                  "filtered": 100
                }
              }
            ]
          }
        },
        {
          "query_block": {
            "select_id": 2,
            "operation": "INTERSECT",
            "cost": "COST_REPLACED",
            "nested_loop": [
              {
                "table": {
                  "table_name": "t2",
                  "access_type": "ALL",
                  "loops": 1,
                  "rows": 3,
                  "cost": "COST_REPLACED",
                  "filtered": 100
                }
              }
            ]
          }
        },
        {
          "query_block": {
            "select_id": 3,
            "operation": "INTERSECT",
            "cost": "COST_REPLACED",
            "nested_loop": [
              {
                "table": {
                  "table_name": "t3",
                  "access_type": "ALL",
                  "loops": 1,
                  "rows": 3,
                  "cost": "COST_REPLACED",
                  "filtered": 100
                }
              }
            ]
          }
        }
      ]
    }
  }
}
ANALYZE format=json (select a,b from t1) intersect (select c,d from t2) intersect (select e,f from t3);
ANALYZE
{
  "query_optimization": {
    "r_total_time_ms": "REPLACED"
  },
  "query_block": {
    "union_result": {
      "table_name": "<intersect1,2,3>",
      "access_type": "ALL",
      "r_loops": 1,
      "r_rows": 1,
      "query_specifications": [
        {
          "query_block": {
            "select_id": 1,
            "cost": "REPLACED",
            "r_loops": 1,
            "r_total_time_ms": "REPLACED",
            "nested_loop": [
              {
                "table": {
                  "table_name": "t1",
                  "access_type": "ALL",
                  "loops": 1,
                  "r_loops": 1,
                  "rows": 3,
                  "r_rows": 3,
                  "cost": "REPLACED",
                  "r_table_time_ms": "REPLACED",
                  "r_other_time_ms": "REPLACED",
                  "r_engine_stats": REPLACED,
                  "filtered": 100,
                  "r_filtered": 100
                }
              }
            ]
          }
        },
        {
          "query_block": {
            "select_id": 2,
            "operation": "INTERSECT",
            "cost": "REPLACED",
            "r_loops": 1,
            "r_total_time_ms": "REPLACED",
            "nested_loop": [
              {
                "table": {
                  "table_name": "t2",
                  "access_type": "ALL",
                  "loops": 1,
                  "r_loops": 1,
                  "rows": 3,
                  "r_rows": 3,
                  "cost": "REPLACED",
                  "r_table_time_ms": "REPLACED",
                  "r_other_time_ms": "REPLACED",
                  "r_engine_stats": REPLACED,
                  "filtered": 100,
                  "r_filtered": 100
                }
              }
            ]
          }
        },
        {
          "query_block": {
            "select_id": 3,
            "operation": "INTERSECT",
            "cost": "REPLACED",
            "r_loops": 1,
            "r_total_time_ms": "REPLACED",
            "nested_loop": [
              {
                "table": {
                  "table_name": "t3",
                  "access_type": "ALL",
                  "loops": 1,
                  "r_loops": 1,
                  "rows": 3,
                  "r_rows": 3,
                  "cost": "REPLACED",
                  "r_table_time_ms": "REPLACED",
                  "r_other_time_ms": "REPLACED",
                  "r_engine_stats": REPLACED,
                  "filtered": 100,
                  "r_filtered": 100
                }
              }
            ]
          }
        }
      ]
    }
  }
}
ANALYZE format=json select * from ((select a,b from t1) intersect (select c,d from t2) intersect (select e,f from t3)) a;
ANALYZE
{
  "query_optimization": {
    "r_total_time_ms": "REPLACED"
  },
  "query_block": {
    "select_id": 1,
    "cost": "REPLACED",
    "r_loops": 1,
    "r_total_time_ms": "REPLACED",
    "nested_loop": [
      {
        "table": {
          "table_name": "<derived2>",
          "access_type": "ALL",
          "loops": 1,
          "r_loops": 1,
          "rows": 3,
          "r_rows": 1,
          "cost": "REPLACED",
          "r_table_time_ms": "REPLACED",
          "r_other_time_ms": "REPLACED",
          "filtered": 100,
          "r_filtered": 100,
          "materialized": {
            "query_block": {
              "union_result": {
                "table_name": "<intersect2,3,4>",
                "access_type": "ALL",
                "r_loops": 1,
                "r_rows": 1,
                "query_specifications": [
                  {
                    "query_block": {
                      "select_id": 2,
                      "cost": "REPLACED",
                      "r_loops": 1,
                      "r_total_time_ms": "REPLACED",
                      "nested_loop": [
                        {
                          "table": {
                            "table_name": "t1",
                            "access_type": "ALL",
                            "loops": 1,
                            "r_loops": 1,
                            "rows": 3,
                            "r_rows": 3,
                            "cost": "REPLACED",
                            "r_table_time_ms": "REPLACED",
                            "r_other_time_ms": "REPLACED",
                            "r_engine_stats": REPLACED,
                            "filtered": 100,
                            "r_filtered": 100
                          }
                        }
                      ]
                    }
                  },
                  {
                    "query_block": {
                      "select_id": 3,
                      "operation": "INTERSECT",
                      "cost": "REPLACED",
                      "r_loops": 1,
                      "r_total_time_ms": "REPLACED",
                      "nested_loop": [
                        {
                          "table": {
                            "table_name": "t2",
                            "access_type": "ALL",
                            "loops": 1,
                            "r_loops": 1,
                            "rows": 3,
                            "r_rows": 3,
                            "cost": "REPLACED",
                            "r_table_time_ms": "REPLACED",
                            "r_other_time_ms": "REPLACED",
                            "r_engine_stats": REPLACED,
                            "filtered": 100,
                            "r_filtered": 100
                          }
                        }
                      ]
                    }
                  },
                  {
                    "query_block": {
                      "select_id": 4,
                      "operation": "INTERSECT",
                      "cost": "REPLACED",
                      "r_loops": 1,
                      "r_total_time_ms": "REPLACED",
                      "nested_loop": [
                        {
                          "table": {
                            "table_name": "t3",
                            "access_type": "ALL",
                            "loops": 1,
                            "r_loops": 1,
                            "rows": 3,
                            "r_rows": 3,
                            "cost": "REPLACED",
                            "r_table_time_ms": "REPLACED",
                            "r_other_time_ms": "REPLACED",
                            "r_engine_stats": REPLACED,
                            "filtered": 100,
                            "r_filtered": 100
                          }
                        }
                      ]
                    }
                  }
                ]
              }
            }
          }
        }
      }
    ]
  }
}
select * from ((select a,b from t1) intersect (select c,d from t2) intersect (select e,f from t3)) a;
a	b
2	2
prepare stmt from "(select a,b from t1) intersect (select c,d from t2) intersect (select e,f from t3);";
execute stmt;
a	b
2	2
execute stmt;
a	b
2	2
prepare stmt from "select * from ((select a,b from t1) intersect (select c,d from t2) intersect (select e,f from t3)) a";
execute stmt;
a	b
2	2
execute stmt;
a	b
2	2
(select a,b from t1) intersect (select c,e from t2,t3);
a	b
2	2
EXPLAIN (select a,b from t1) intersect (select c,e from t2,t3);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	
2	INTERSECT	t2	ALL	NULL	NULL	NULL	NULL	3	
2	INTERSECT	t3	ALL	NULL	NULL	NULL	NULL	3	Using join buffer (flat, BNL join)
NULL	INTERSECT RESULT	<intersect1,2>	ALL	NULL	NULL	NULL	NULL	NULL	
EXPLAIN extended (select a,b from t1) intersect (select c,e from t2,t3);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	
2	INTERSECT	t2	ALL	NULL	NULL	NULL	NULL	3	100.00	
2	INTERSECT	t3	ALL	NULL	NULL	NULL	NULL	3	100.00	Using join buffer (flat, BNL join)
NULL	INTERSECT RESULT	<intersect1,2>	ALL	NULL	NULL	NULL	NULL	NULL	NULL	
Warnings:
Note	1003	(/* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1`) intersect (/* select#2 */ select `test`.`t2`.`c` AS `c`,`test`.`t3`.`e` AS `e` from `test`.`t2` join `test`.`t3`)
EXPLAIN extended select * from ((select a,b from t1) intersect (select c,e from t2,t3)) a;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	3	100.00	
2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	
3	INTERSECT	t2	ALL	NULL	NULL	NULL	NULL	3	100.00	
3	INTERSECT	t3	ALL	NULL	NULL	NULL	NULL	3	100.00	Using join buffer (flat, BNL join)
NULL	INTERSECT RESULT	<intersect2,3>	ALL	NULL	NULL	NULL	NULL	NULL	NULL	
Warnings:
Note	1003	/* select#1 */ select `a`.`a` AS `a`,`a`.`b` AS `b` from ((/* select#2 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1`) intersect (/* select#3 */ select `test`.`t2`.`c` AS `c`,`test`.`t3`.`e` AS `e` from `test`.`t2` join `test`.`t3`)) `a`
set @@optimizer_switch='optimize_join_buffer_size=off';
EXPLAIN format=json (select a,b from t1) intersect (select c,e from t2,t3);
EXPLAIN
{
  "query_block": {
    "union_result": {
      "table_name": "<intersect1,2>",
      "access_type": "ALL",
      "query_specifications": [
        {
          "query_block": {
            "select_id": 1,
            "cost": "COST_REPLACED",
            "nested_loop": [
              {
                "table": {
                  "table_name": "t1",
                  "access_type": "ALL",
                  "loops": 1,
                  "rows": 3,
                  "cost": "COST_REPLACED",
                  "filtered": 100
                }
              }
            ]
          }
        },
        {
          "query_block": {
            "select_id": 2,
            "operation": "INTERSECT",
            "cost": "COST_REPLACED",
            "nested_loop": [
              {
                "table": {
                  "table_name": "t2",
                  "access_type": "ALL",
                  "loops": 1,
                  "rows": 3,
                  "cost": "COST_REPLACED",
                  "filtered": 100
                }
              },
              {
                "block-nl-join": {
                  "table": {
                    "table_name": "t3",
                    "access_type": "ALL",
                    "loops": 3,
                    "rows": 3,
                    "cost": "COST_REPLACED",
                    "filtered": 100
                  },
                  "buffer_type": "flat",
                  "buffer_size": "256Kb",
                  "join_type": "BNL"
                }
              }
            ]
          }
        }
      ]
    }
  }
}
ANALYZE format=json (select a,b from t1) intersect (select c,e from t2,t3);
ANALYZE
{
  "query_optimization": {
    "r_total_time_ms": "REPLACED"
  },
  "query_block": {
    "union_result": {
      "table_name": "<intersect1,2>",
      "access_type": "ALL",
      "r_loops": 1,
      "r_rows": 1,
      "query_specifications": [
        {
          "query_block": {
            "select_id": 1,
            "cost": "REPLACED",
            "r_loops": 1,
            "r_total_time_ms": "REPLACED",
            "nested_loop": [
              {
                "table": {
                  "table_name": "t1",
                  "access_type": "ALL",
                  "loops": 1,
                  "r_loops": 1,
                  "rows": 3,
                  "r_rows": 3,
                  "cost": "REPLACED",
                  "r_table_time_ms": "REPLACED",
                  "r_other_time_ms": "REPLACED",
                  "r_engine_stats": REPLACED,
                  "filtered": 100,
                  "r_filtered": 100
                }
              }
            ]
          }
        },
        {
          "query_block": {
            "select_id": 2,
            "operation": "INTERSECT",
            "cost": "REPLACED",
            "r_loops": 1,
            "r_total_time_ms": "REPLACED",
            "nested_loop": [
              {
                "table": {
                  "table_name": "t2",
                  "access_type": "ALL",
                  "loops": 1,
                  "r_loops": 1,
                  "rows": 3,
                  "r_rows": 3,
                  "cost": "REPLACED",
                  "r_table_time_ms": "REPLACED",
                  "r_other_time_ms": "REPLACED",
                  "r_engine_stats": REPLACED,
                  "filtered": 100,
                  "r_filtered": 100
                }
              },
              {
                "block-nl-join": {
                  "table": {
                    "table_name": "t3",
                    "access_type": "ALL",
                    "loops": 3,
                    "r_loops": 1,
                    "rows": 3,
                    "r_rows": 3,
                    "cost": "REPLACED",
                    "r_table_time_ms": "REPLACED",
                    "r_other_time_ms": "REPLACED",
                    "r_engine_stats": REPLACED,
                    "filtered": 100,
                    "r_filtered": 100
                  },
                  "buffer_type": "flat",
                  "buffer_size": "256Kb",
                  "join_type": "BNL",
                  "r_loops": 3,
                  "r_filtered": 100,
                  "r_unpack_time_ms": "REPLACED",
                  "r_other_time_ms": "REPLACED",
                  "r_effective_rows": 3
                }
              }
            ]
          }
        }
      ]
    }
  }
}
ANALYZE format=json select * from ((select a,b from t1) intersect (select c,e from t2,t3)) a;
ANALYZE
{
  "query_optimization": {
    "r_total_time_ms": "REPLACED"
  },
  "query_block": {
    "select_id": 1,
    "cost": "REPLACED",
    "r_loops": 1,
    "r_total_time_ms": "REPLACED",
    "nested_loop": [
      {
        "table": {
          "table_name": "<derived2>",
          "access_type": "ALL",
          "loops": 1,
          "r_loops": 1,
          "rows": 3,
          "r_rows": 1,
          "cost": "REPLACED",
          "r_table_time_ms": "REPLACED",
          "r_other_time_ms": "REPLACED",
          "filtered": 100,
          "r_filtered": 100,
          "materialized": {
            "query_block": {
              "union_result": {
                "table_name": "<intersect2,3>",
                "access_type": "ALL",
                "r_loops": 1,
                "r_rows": 1,
                "query_specifications": [
                  {
                    "query_block": {
                      "select_id": 2,
                      "cost": "REPLACED",
                      "r_loops": 1,
                      "r_total_time_ms": "REPLACED",
                      "nested_loop": [
                        {
                          "table": {
                            "table_name": "t1",
                            "access_type": "ALL",
                            "loops": 1,
                            "r_loops": 1,
                            "rows": 3,
                            "r_rows": 3,
                            "cost": "REPLACED",
                            "r_table_time_ms": "REPLACED",
                            "r_other_time_ms": "REPLACED",
                            "r_engine_stats": REPLACED,
                            "filtered": 100,
                            "r_filtered": 100
                          }
                        }
                      ]
                    }
                  },
                  {
                    "query_block": {
                      "select_id": 3,
                      "operation": "INTERSECT",
                      "cost": "REPLACED",
                      "r_loops": 1,
                      "r_total_time_ms": "REPLACED",
                      "nested_loop": [
                        {
                          "table": {
                            "table_name": "t2",
                            "access_type": "ALL",
                            "loops": 1,
                            "r_loops": 1,
                            "rows": 3,
                            "r_rows": 3,
                            "cost": "REPLACED",
                            "r_table_time_ms": "REPLACED",
                            "r_other_time_ms": "REPLACED",
                            "r_engine_stats": REPLACED,
                            "filtered": 100,
                            "r_filtered": 100
                          }
                        },
                        {
                          "block-nl-join": {
                            "table": {
                              "table_name": "t3",
                              "access_type": "ALL",
                              "loops": 3,
                              "r_loops": 1,
                              "rows": 3,
                              "r_rows": 3,
                              "cost": "REPLACED",
                              "r_table_time_ms": "REPLACED",
                              "r_other_time_ms": "REPLACED",
                              "r_engine_stats": REPLACED,
                              "filtered": 100,
                              "r_filtered": 100
                            },
                            "buffer_type": "flat",
                            "buffer_size": "256Kb",
                            "join_type": "BNL",
                            "r_loops": 3,
                            "r_filtered": 100,
                            "r_unpack_time_ms": "REPLACED",
                            "r_other_time_ms": "REPLACED",
                            "r_effective_rows": 3
                          }
                        }
                      ]
                    }
                  }
                ]
              }
            }
          }
        }
      }
    ]
  }
}
set @@optimizer_switch=@save_optimizer_switch;
select * from ((select a,b from t1) intersect (select c,e from t2,t3)) a;
a	b
2	2
prepare stmt from "(select a,b from t1) intersect (select c,e from t2,t3);";
execute stmt;
a	b
2	2
execute stmt;
a	b
2	2
prepare stmt from "select * from ((select a,b from t1) intersect (select c,e from t2,t3)) a";
execute stmt;
a	b
2	2
execute stmt;
a	b
2	2
drop tables t1,t2,t3;
select 1 as a from dual intersect select 1 from dual;
a
1
(select 1 from dual) intersect (select 1 from dual);
1
1
(select 1 from dual into @v) intersect (select 1 from dual);
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'into @v) intersect (select 1 from dual)' at line 1
select 1 from dual ORDER BY 1 intersect select 1 from dual;
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'intersect select 1 from dual' at line 1
select 1 as a from dual union all select 1 from dual;
a
1
1
create table t1 (a int, b blob, a1 int, b1 blob);
create table t2 (c int, d blob, c1 int, d1 blob);
insert into t1 values (1,"ddd", 1, "sdfrrwwww"),(2, "fgh", 2, "dffggtt");
insert into t2 values (2, "fgh", 2, "dffggtt"),(3, "ffggddd", 3, "dfgg");
(select a,b,b1 from t1) intersect (select c,d,d1 from t2);
a	b	b1
2	fgh	dffggtt
drop tables t1,t2;
create table t1 (a int, b blob) engine=MyISAM;
create table t2 (c int, d blob) engine=MyISAM;
create table t3 (e int, f blob) engine=MyISAM;
insert into t1 values (1,1),(2,2),(3,3);
insert into t2 values (2,2),(3,3),(4,4);
insert into t3 values (1,1),(2,2),(5,5);
(select a,b from t1) intersect (select c,d from t2) intersect (select e,f from t3);
a	b
2	2
select * from ((select a,b from t1) intersect (select c,d from t2) intersect (select e,f from t3)) a;
a	b
2	2
prepare stmt from "(select a,b from t1) intersect (select c,d from t2) intersect (select e,f from t3);";
execute stmt;
a	b
2	2
execute stmt;
a	b
2	2
prepare stmt from "select * from ((select a,b from t1) intersect (select c,d from t2) intersect (select e,f from t3)) a";
execute stmt;
a	b
2	2
execute stmt;
a	b
2	2
create table t4  (select a,b from t1) intersect (select c,d from t2) intersect (select e,f from t3);
show create table t4;
Table	Create Table
t4	CREATE TABLE `t4` (
  `a` int(11) DEFAULT NULL,
  `b` blob DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
drop tables t1,t2,t3,t4;
create table t1 (a int, b blob) engine=MyISAM;
create table t2 (c int, d blob) engine=MyISAM;
create table t3 (e int, f blob) engine=MyISAM;
insert into t1 values (1,1),(2,2),(3,3);
insert into t2 values (2,2),(3,3);
insert into t3 values (1,1),(2,2),(3,3);
(select a,b from t1) intersect (select c,d from t2) intersect (select e,f from t3) union (select 4,4);
a	b
2	2
3	3
4	4
(select a,b from t1) intersect (select c,d from t2) intersect (select e,f from t3) union (select 4,4) except (select 2,2);
a	b
3	3
4	4
drop tables t1,t2,t3;
create table t1 (a int, b int);
create table t2 (c int, d int);
create table t3 (e int, f int);
insert into t1 values (1,1),(2,2),(3,3);
insert into t2 values (2,2),(3,3);
insert into t3 values (1,1),(2,2),(3,3);
(select a,b from t1) intersect (select c,d from t2) intersect (select e,f from t3) union (select 4,4);
a	b
2	2
3	3
4	4
(select a,b from t1) intersect (select c,d from t2) intersect (select e,f from t3) union (select 4,4) except (select 2,2);
a	b
3	3
4	4
drop tables t1,t2,t3;
#
# INTERSECT precedence
#
create table t1 (a int, b blob) engine=MyISAM;
create table t2 (c int, d blob) engine=MyISAM;
create table t3 (e int, f blob) engine=MyISAM;
insert into t1 values (5,5),(6,6);
insert into t2 values (2,2),(3,3);
insert into t3 values (1,1),(3,3);
(select a,b from t1) union (select c,d from t2) intersect (select e,f from t3) union (select 4,4);
a	b
3	3
4	4
5	5
6	6
explain extended
(select a,b from t1) union (select c,d from t2) intersect (select e,f from t3) union (select 4,4);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	
5	UNION	<derived2>	ALL	NULL	NULL	NULL	NULL	2	100.00	
2	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	
3	INTERSECT	t3	ALL	NULL	NULL	NULL	NULL	2	100.00	
NULL	INTERSECT RESULT	<intersect2,3>	ALL	NULL	NULL	NULL	NULL	NULL	NULL	
4	UNION	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
NULL	UNION RESULT	<union1,5,4>	ALL	NULL	NULL	NULL	NULL	NULL	NULL	
Warnings:
Note	1003	(/* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1`) union /* select#5 */ select `__5`.`c` AS `c`,`__5`.`d` AS `d` from ((/* select#2 */ select `test`.`t2`.`c` AS `c`,`test`.`t2`.`d` AS `d` from `test`.`t2`) intersect (/* select#3 */ select `test`.`t3`.`e` AS `e`,`test`.`t3`.`f` AS `f` from `test`.`t3`)) `__5` union (/* select#4 */ select 4 AS `4`,4 AS `4`)
(select e,f from t3) intersect (select c,d from t2) union (select a,b from t1) union (select 4,4);
e	f
3	3
4	4
5	5
6	6
explain extended
(select e,f from t3) intersect (select c,d from t2) union (select a,b from t1) union (select 4,4);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	t3	ALL	NULL	NULL	NULL	NULL	2	100.00	
2	INTERSECT	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	
3	UNION	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	
4	UNION	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
NULL	UNIT RESULT	<unit1,2,3,4>	ALL	NULL	NULL	NULL	NULL	NULL	NULL	
Warnings:
Note	1003	(/* select#1 */ select `test`.`t3`.`e` AS `e`,`test`.`t3`.`f` AS `f` from `test`.`t3`) intersect (/* select#2 */ select `test`.`t2`.`c` AS `c`,`test`.`t2`.`d` AS `d` from `test`.`t2`) union (/* select#3 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1`) union (/* select#4 */ select 4 AS `4`,4 AS `4`)
(/* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1`) union /* select#3 */ select `__3`.`c` AS `c`,`__3`.`d` AS `d` from ((/* select#2 */ select `test`.`t2`.`c` AS `c`,`test`.`t2`.`d` AS `d` from `test`.`t2`) intersect (/* select#4 */ select `test`.`t3`.`e` AS `e`,`test`.`t3`.`f` AS `f` from `test`.`t3`)) `__3` union (/* select#5 */ select 4 AS `4`,4 AS `4`);
a	b
3	3
4	4
5	5
6	6
prepare stmt from "(select a,b from t1) union (select c,d from t2) intersect (select e,f from t3) union (select 4,4)";
execute stmt;
a	b
5	5
6	6
3	3
4	4
execute stmt;
a	b
5	5
6	6
3	3
4	4
create view v1 as (select a,b from t1) union (select c,d from t2) intersect (select e,f from t3) union (select 4,4);
select b,a,b+1 from v1;
b	a	b+1
3	3	4
4	4	5
5	5	6
6	6	7
select b,a,b+1 from v1 where a > 3;
b	a	b+1
4	4	5
5	5	6
6	6	7
create procedure p1()
select * from v1;
call p1();
a	b
3	3
4	4
5	5
6	6
call p1();
a	b
3	3
4	4
5	5
6	6
drop procedure p1;
create procedure p1()
(select a,b from t1) union (select c,d from t2) intersect (select e,f from t3) union (select 4,4);
call p1();
a	b
3	3
4	4
5	5
6	6
call p1();
a	b
3	3
4	4
5	5
6	6
drop procedure p1;
show create view v1;
View	Create View	character_set_client	collation_connection
v1	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS (select `t1`.`a` AS `a`,`t1`.`b` AS `b` from `t1`) union select `__6`.`c` AS `c`,`__6`.`d` AS `d` from ((select `t2`.`c` AS `c`,`t2`.`d` AS `d` from `t2`) intersect (select `t3`.`e` AS `e`,`t3`.`f` AS `f` from `t3`)) `__6` union (select 4 AS `4`,4 AS `4`)	latin1	latin1_swedish_ci
drop view v1;
drop tables t1,t2,t3;
#
# MDEV-14346:incorrect result of intersect with ANY/ALL/IN subquery
#
CREATE TABLE t (i INT);
INSERT INTO t VALUES (1),(2);
SELECT * FROM t WHERE i != ANY ( SELECT 6 INTERSECT SELECT 3 );
i
select i from t where
exists ((select 6 as r from dual having t.i <> 6)
intersect
(select 3 from dual having t.i <> 3));
i
drop table t;
#
# MDEV-13749: Server crashes in _ma_unique_hash /
# JOIN_CACHE::generate_full_extensions on INTERSECT
#
CREATE TABLE t1 (a varchar(32)) ENGINE=MyISAM;
INSERT INTO t1 VALUES
('Jakarta'),('Lisbon'),('Honolulu'),('Lusaka'),('Barcelona'),('Taipei'),
('Brussels'),('Orlando'),('Osaka'),('Quito'),('Lima'),('Tunis'),
('Unalaska'),('Rotterdam'),('Zagreb'),('Ufa'),('Ryazan'),('Xiamen'),
('London'),('Izmir'),('Samara'),('Bern'),('Zhengzhou'),('Vladivostok'),
('Yangon'),('Victoria'),('Warsaw'),('Luanda'),('Leon'),('Bangkok'),
('Wellington'),('Zibo'),('Qiqihar'),('Delhi'),('Hamburg'),('Ottawa'),
('Vaduz');
CREATE TABLE t2 (b varchar(32)) ENGINE=MyISAM;
INSERT INTO t2 VALUES
('Gaza'),('Jeddah'),('Beirut'),('Incheon'),('Tbilisi'),('Izmir'),
('Quito'),('Riga'),('Freetown'),('Zagreb'),('Caracas'),('Orlando'),
('Kingston'),('Turin'),('Xinyang'),('Osaka'),('Albany'),('Geneva'),
('Omsk'),('Kazan'),('Quezon'),('Indore'),('Odessa'),('Xiamen'),
('Winnipeg'),('Yakutsk'),('Nairobi'),('Ufa'),('Helsinki'),('Vilnius'),
('Aden'),('Liverpool'),('Honolulu'),('Frankfurt'),('Glasgow'),
('Vienna'),('Jackson'),('Jakarta'),('Sydney'),('Oslo'),('Novgorod'),
('Norilsk'),('Izhevsk'),('Istanbul'),('Nice');
CREATE TABLE t3 (c varchar(32)) ENGINE=MyISAM;
INSERT INTO t3 VALUES
('Nicosia'),('Istanbul'),('Richmond'),('Stockholm'),('Dublin'),
('Wichita'),('Warsaw'),('Glasgow'),('Winnipeg'),('Irkutsk'),('Quito'),
('Xiamen'),('Berlin'),('Rome'),('Denver'),('Dallas'),('Kabul'),
('Prague'),('Izhevsk'),('Tirana'),('Sofia'),('Detroit'),('Sorbonne');
select count(*) from (
SELECT * FROM t1 LEFT OUTER JOIN t2 LEFT OUTER JOIN t3 ON b < c ON a > b
INTERSECT
SELECT * FROM t1 LEFT OUTER JOIN t2 LEFT OUTER JOIN t3 ON b < c ON a > b
) a;
count(*)
14848
drop table t1,t2,t3;
CREATE TABLE t1 (a varchar(32) not null) ENGINE=MyISAM;
INSERT INTO t1 VALUES
('Jakarta'),('Lisbon'),('Honolulu'),('Lusaka'),('Barcelona'),('Taipei'),
('Brussels'),('Orlando'),('Osaka'),('Quito'),('Lima'),('Tunis'),
('Unalaska'),('Rotterdam'),('Zagreb'),('Ufa'),('Ryazan'),('Xiamen'),
('London'),('Izmir'),('Samara'),('Bern'),('Zhengzhou'),('Vladivostok'),
('Yangon'),('Victoria'),('Warsaw'),('Luanda'),('Leon'),('Bangkok'),
('Wellington'),('Zibo'),('Qiqihar'),('Delhi'),('Hamburg'),('Ottawa'),
('Vaduz');
CREATE TABLE t2 (b varchar(32) not null) ENGINE=MyISAM;
INSERT INTO t2 VALUES
('Gaza'),('Jeddah'),('Beirut'),('Incheon'),('Tbilisi'),('Izmir'),
('Quito'),('Riga'),('Freetown'),('Zagreb'),('Caracas'),('Orlando'),
('Kingston'),('Turin'),('Xinyang'),('Osaka'),('Albany'),('Geneva'),
('Omsk'),('Kazan'),('Quezon'),('Indore'),('Odessa'),('Xiamen'),
('Winnipeg'),('Yakutsk'),('Nairobi'),('Ufa'),('Helsinki'),('Vilnius'),
('Aden'),('Liverpool'),('Honolulu'),('Frankfurt'),('Glasgow'),
('Vienna'),('Jackson'),('Jakarta'),('Sydney'),('Oslo'),('Novgorod'),
('Norilsk'),('Izhevsk'),('Istanbul'),('Nice');
CREATE TABLE t3 (c varchar(32) not null) ENGINE=MyISAM;
INSERT INTO t3 VALUES
('Nicosia'),('Istanbul'),('Richmond'),('Stockholm'),('Dublin'),
('Wichita'),('Warsaw'),('Glasgow'),('Winnipeg'),('Irkutsk'),('Quito'),
('Xiamen'),('Berlin'),('Rome'),('Denver'),('Dallas'),('Kabul'),
('Prague'),('Izhevsk'),('Tirana'),('Sofia'),('Detroit'),('Sorbonne');
select count(*) from (
SELECT * FROM t1 LEFT OUTER JOIN t2 LEFT OUTER JOIN t3 ON b < c ON a > b
INTERSECT
SELECT * FROM t1 LEFT OUTER JOIN t2 LEFT OUTER JOIN t3 ON b < c ON a > b
) a;
count(*)
14848
drop table t1,t2,t3;
#
# MDEV-13695: INTERSECT precedence is not in line with Oracle even
# in SQL_MODE=Oracle
#
create table t12(c1 int);
insert into t12 values(1);
insert into t12 values(2);
create table t13(c1 int);
insert into t13 values(1);
insert into t13 values(3);
create table t234(c1 int);
insert into t234 values(2);
insert into t234 values(3);
insert into t234 values(4);
select * from t13 union select * from t234 intersect select * from t12;
c1
1
2
3
drop table t12,t13,t234;
# End of 10.3 tests
#
# MDEV-18701: Wrong result from query that uses INTERSECT after UNION ALL
#
create table t1 (a int);
insert into t1 values (3), (1), (7), (3), (2), (7), (4);
create table t2 (a int);
insert into t2 values (4), (5), (9), (1), (8), (9);
create table t3 (a int);
insert into t3 values (8), (1), (8), (2), (3), (7), (2);
select * from t1 where a > 4
union all 
select * from t2 where a < 5
intersect
select * from t3 where a < 5;
a
1
7
7
explain extended
select * from t1 where a > 4
union all 
select * from t2 where a < 5
intersect
select * from t3 where a < 5;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	7	100.00	Using where
4	UNION	<derived2>	ALL	NULL	NULL	NULL	NULL	6	100.00	
2	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	6	100.00	Using where
3	INTERSECT	t3	ALL	NULL	NULL	NULL	NULL	7	100.00	Using where
NULL	INTERSECT RESULT	<intersect2,3>	ALL	NULL	NULL	NULL	NULL	NULL	NULL	
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`a` AS `a` from `test`.`t1` where `test`.`t1`.`a` > 4 union all /* select#4 */ select `__4`.`a` AS `a` from (/* select#2 */ select `test`.`t2`.`a` AS `a` from `test`.`t2` where `test`.`t2`.`a` < 5 intersect /* select#3 */ select `test`.`t3`.`a` AS `a` from `test`.`t3` where `test`.`t3`.`a` < 5) `__4`
drop table t1,t2,t3;