create table t0(a int);
insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
create table t1(a int);
insert into t1 select A.a + B.a* 10 + C.a * 100 from t0 A, t0 B, t0 C;
create table t2 (
a int, 
b int, 
key (a)
);
insert into t2 select A.a*1000 + B.a, A.a*1000 + B.a from t0 A, t1 B;
#
# Try an UPDATE that uses filesort:
#
explain 
update t2 set b=b+1 order by b limit 5;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	10000	Using filesort
explain format=json
update t2 set b=b+1 order by b limit 5;
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "filesort": {
      "table": {
        "update": 1,
        "table_name": "t2",
        "access_type": "ALL",
        "rows": 10000
      }
    }
  }
}
analyze format=json
update t2 set b=b+1 order by b limit 5;
ANALYZE
{
  "query_block": {
    "select_id": 1,
    "r_total_time_ms": "REPLACED",
    "filesort": {
      "r_loops": 1,
      "r_total_time_ms": "REPLACED",
      "r_limit": 5,
      "r_used_priority_queue": true,
      "r_output_rows": 6,
      "r_sort_mode": "sort_key,rowid",
      "table": {
        "update": 1,
        "table_name": "t2",
        "access_type": "ALL",
        "rows": 10000,
        "r_rows": 10000,
        "r_filtered": 100,
        "r_total_time_ms": "REPLACED"
      }
    }
  }
}
#
# Try an UPDATE that uses buffering:
#
explain
update t2 set a=a+1 where a<10;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t2	range	a	a	5	NULL	9	Using where; Using buffer
explain format=json
update t2 set a=a+1 where a<10;
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "buffer": {
      "table": {
        "update": 1,
        "table_name": "t2",
        "access_type": "range",
        "possible_keys": ["a"],
        "key": "a",
        "key_length": "5",
        "used_key_parts": ["a"],
        "rows": 9,
        "attached_condition": "t2.a < 10"
      }
    }
  }
}
analyze format=json
update t2 set a=a+1 where a<10;
ANALYZE
{
  "query_block": {
    "select_id": 1,
    "r_total_time_ms": "REPLACED",
    "buffer": {
      "table": {
        "update": 1,
        "table_name": "t2",
        "access_type": "range",
        "possible_keys": ["a"],
        "key": "a",
        "key_length": "5",
        "used_key_parts": ["a"],
        "rows": 9,
        "r_rows": 10,
        "r_filtered": 100,
        "r_total_time_ms": "REPLACED",
        "attached_condition": "t2.a < 10"
      }
    }
  }
}
#
# Try a DELETE that uses filesort:
#
explain 
delete from t2 order by b limit 5;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	10000	Using filesort
explain format=json
delete from t2 order by b limit 5;
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "filesort": {
      "table": {
        "delete": 1,
        "table_name": "t2",
        "access_type": "ALL",
        "rows": 10000
      }
    }
  }
}
analyze format=json
delete from t2 order by b limit 5;
ANALYZE
{
  "query_block": {
    "select_id": 1,
    "r_total_time_ms": "REPLACED",
    "filesort": {
      "r_loops": 1,
      "r_total_time_ms": "REPLACED",
      "r_used_priority_queue": false,
      "r_output_rows": 10000,
      "r_buffer_size": "REPLACED",
      "r_sort_mode": "sort_key,rowid",
      "table": {
        "delete": 1,
        "table_name": "t2",
        "access_type": "ALL",
        "rows": 10000,
        "r_rows": 10000,
        "r_filtered": 100,
        "r_total_time_ms": "REPLACED"
      }
    }
  }
}
#
# Try a SELECT with QEP in form: filesort { tmp_table { join } } 
#
explain
select * from t0,t2 where t2.a=t0.a order by t2.b limit 4;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t0	ALL	NULL	NULL	NULL	NULL	10	Using where; Using temporary; Using filesort
1	SIMPLE	t2	ref	a	a	5	test.t0.a	1	
explain format=json
select * from t0,t2 where t2.a=t0.a order by t2.b limit 4;
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "filesort": {
      "sort_key": "t2.b",
      "temporary_table": {
        "table": {
          "table_name": "t0",
          "access_type": "ALL",
          "rows": 10,
          "filtered": 100,
          "attached_condition": "t0.a is not null"
        },
        "table": {
          "table_name": "t2",
          "access_type": "ref",
          "possible_keys": ["a"],
          "key": "a",
          "key_length": "5",
          "used_key_parts": ["a"],
          "ref": ["test.t0.a"],
          "rows": 1,
          "filtered": 100
        }
      }
    }
  }
}
analyze format=json
select * from t0,t2 where t2.a=t0.a order by t2.b limit 4;
ANALYZE
{
  "query_block": {
    "select_id": 1,
    "r_loops": 1,
    "r_total_time_ms": "REPLACED",
    "filesort": {
      "sort_key": "t2.b",
      "r_loops": 1,
      "r_total_time_ms": "REPLACED",
      "r_limit": 4,
      "r_used_priority_queue": true,
      "r_output_rows": 4,
      "r_sort_mode": "sort_key,rowid",
      "temporary_table": {
        "table": {
          "table_name": "t0",
          "access_type": "ALL",
          "r_loops": 1,
          "rows": 10,
          "r_rows": 10,
          "r_table_time_ms": "REPLACED",
          "r_other_time_ms": "REPLACED",
          "filtered": 100,
          "r_filtered": 100,
          "attached_condition": "t0.a is not null"
        },
        "table": {
          "table_name": "t2",
          "access_type": "ref",
          "possible_keys": ["a"],
          "key": "a",
          "key_length": "5",
          "used_key_parts": ["a"],
          "ref": ["test.t0.a"],
          "r_loops": 10,
          "rows": 1,
          "r_rows": 0.4,
          "r_table_time_ms": "REPLACED",
          "r_other_time_ms": "REPLACED",
          "filtered": 100,
          "r_filtered": 100
        }
      }
    }
  }
}
#
# Try a SELECT with QEP in form: join { filesort { table0 }, table2 }
#
explain
select * from t0,t2 where t2.a=t0.a order by t0.a limit 4;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t0	ALL	NULL	NULL	NULL	NULL	10	Using where; Using filesort
1	SIMPLE	t2	ref	a	a	5	test.t0.a	1	
explain format=json
select * from t0,t2 where t2.a=t0.a order by t0.a limit 4;
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "read_sorted_file": {
      "filesort": {
        "sort_key": "t0.a",
        "table": {
          "table_name": "t0",
          "access_type": "ALL",
          "rows": 10,
          "filtered": 100,
          "attached_condition": "t0.a is not null"
        }
      }
    },
    "table": {
      "table_name": "t2",
      "access_type": "ref",
      "possible_keys": ["a"],
      "key": "a",
      "key_length": "5",
      "used_key_parts": ["a"],
      "ref": ["test.t0.a"],
      "rows": 1,
      "filtered": 100
    }
  }
}
analyze format=json 
select * from t0,t2 where t2.a=t0.a order by t0.a limit 4;
ANALYZE
{
  "query_block": {
    "select_id": 1,
    "r_loops": 1,
    "r_total_time_ms": "REPLACED",
    "read_sorted_file": {
      "r_rows": 10,
      "filesort": {
        "sort_key": "t0.a",
        "r_loops": 1,
        "r_total_time_ms": "REPLACED",
        "r_used_priority_queue": false,
        "r_output_rows": 10,
        "r_buffer_size": "REPLACED",
        "r_sort_mode": "sort_key,addon_fields",
        "table": {
          "table_name": "t0",
          "access_type": "ALL",
          "r_loops": 1,
          "rows": 10,
          "r_rows": 10,
          "r_table_time_ms": "REPLACED",
          "r_other_time_ms": "REPLACED",
          "filtered": 100,
          "r_filtered": 100,
          "attached_condition": "t0.a is not null"
        }
      }
    },
    "table": {
      "table_name": "t2",
      "access_type": "ref",
      "possible_keys": ["a"],
      "key": "a",
      "key_length": "5",
      "used_key_parts": ["a"],
      "ref": ["test.t0.a"],
      "r_loops": 10,
      "rows": 1,
      "r_rows": 0.4,
      "r_table_time_ms": "REPLACED",
      "r_other_time_ms": "REPLACED",
      "filtered": 100,
      "r_filtered": 100
    }
  }
}
drop table t2;
create table t2 (
a int,
b int,
c int
);
insert into t2 
select 
a.a+10*b.a+100*c.a, 
b.a+10*c.a, 
c.a
from t0 a, t0 b, t0 c;
analyze format=json 
select MAX(b) from t2 where mod(a,2)=0 group by c;
ANALYZE
{
  "query_block": {
    "select_id": 1,
    "r_loops": 1,
    "r_total_time_ms": "REPLACED",
    "filesort": {
      "sort_key": "t2.c",
      "r_loops": 1,
      "r_total_time_ms": "REPLACED",
      "r_used_priority_queue": false,
      "r_output_rows": 10,
      "r_buffer_size": "REPLACED",
      "r_sort_mode": "sort_key,rowid",
      "temporary_table": {
        "table": {
          "table_name": "t2",
          "access_type": "ALL",
          "r_loops": 1,
          "rows": 1000,
          "r_rows": 1000,
          "r_table_time_ms": "REPLACED",
          "r_other_time_ms": "REPLACED",
          "filtered": 100,
          "r_filtered": 50,
          "attached_condition": "t2.a MOD 2 = 0"
        }
      }
    }
  }
}
drop table t2;
#
#  MDEV-8282: crash in filesort() with simple ordered delete
#
create table t3(a int) engine=innodb;
delete from t3 order by a;
# EXPLAIN thinks it will use delete_all_rows():
explain
delete from t3 order by a;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	1	Deleting all rows
# ANALYZE shows that delete_all_rows() didn't work and we deleted rows
# one-by-one:
analyze
delete from t3 order by a;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	1	0.00	100.00	100.00	Using filesort
drop table t3;
#
# A test for duplicate_removal()
#
create table t3 (a int, b int);
insert into t3 select a, 123 from t0;
analyze format=json
select distinct max(t3.b) Q from t0, t3 where t0.a=t3.a group by t0.a order by null;
ANALYZE
{
  "query_block": {
    "select_id": 1,
    "r_loops": 1,
    "r_total_time_ms": "REPLACED",
    "duplicate_removal": {
      "temporary_table": {
        "table": {
          "table_name": "t0",
          "access_type": "ALL",
          "r_loops": 1,
          "rows": 10,
          "r_rows": 10,
          "r_table_time_ms": "REPLACED",
          "r_other_time_ms": "REPLACED",
          "filtered": 100,
          "r_filtered": 100
        },
        "block-nl-join": {
          "table": {
            "table_name": "t3",
            "access_type": "ALL",
            "r_loops": 1,
            "rows": 10,
            "r_rows": 10,
            "r_table_time_ms": "REPLACED",
            "r_other_time_ms": "REPLACED",
            "filtered": 100,
            "r_filtered": 100
          },
          "buffer_type": "flat",
          "buffer_size": "65",
          "join_type": "BNL",
          "attached_condition": "t3.a = t0.a",
          "r_filtered": 10
        }
      }
    }
  }
}
#
# A query with two filesort calls:
#   - first is needed to do group-by-group grouping to calculate COUNT(DISTINCT)
#   - the second is need to produce ORDER BY.
# (see MDEV-7836 for description of the query plan)
create table t5 (a int , b int) ;
create table t6 like t5 ;
create table t7 like t5 ;
insert into t5 values (0, 100), (1, 2), (1, 3), (2, 2), (2, 7),
(2, -1), (3, 10);
insert into t6 values (0, 0), (1, 1), (2, 1), (3, 1), (4, 1);
insert into t7 values (3, 3), (2, 2), (1, 1);
# TODO: This ANALYZE output doesn't make it clear what is used for what.
analyze format=json
select count(distinct t5.b) as sum from t5, t6
where t5.a=t6.a and t6.b > 0 and t5.a <= 5
group by t5.a order by sum limit 1;
ANALYZE
{
  "query_block": {
    "select_id": 1,
    "r_loops": 1,
    "r_total_time_ms": "REPLACED",
    "filesort": {
      "sort_key": "count(distinct t5.b)",
      "r_loops": 1,
      "r_total_time_ms": "REPLACED",
      "r_limit": 1,
      "r_used_priority_queue": true,
      "r_output_rows": 2,
      "r_sort_mode": "sort_key,rowid",
      "temporary_table": {
        "filesort": {
          "sort_key": "t5.a",
          "r_loops": 1,
          "r_total_time_ms": "REPLACED",
          "r_used_priority_queue": false,
          "r_output_rows": 6,
          "r_buffer_size": "REPLACED",
          "r_sort_mode": "sort_key,rowid",
          "temporary_table": {
            "table": {
              "table_name": "t6",
              "access_type": "ALL",
              "r_loops": 1,
              "rows": 5,
              "r_rows": 5,
              "r_table_time_ms": "REPLACED",
              "r_other_time_ms": "REPLACED",
              "filtered": 100,
              "r_filtered": 80,
              "attached_condition": "t6.b > 0 and t6.a <= 5"
            },
            "block-nl-join": {
              "table": {
                "table_name": "t5",
                "access_type": "ALL",
                "r_loops": 1,
                "rows": 7,
                "r_rows": 7,
                "r_table_time_ms": "REPLACED",
                "r_other_time_ms": "REPLACED",
                "filtered": 100,
                "r_filtered": 100
              },
              "buffer_type": "flat",
              "buffer_size": "119",
              "join_type": "BNL",
              "attached_condition": "t5.a = t6.a",
              "r_filtered": 21.42857143
            }
          }
        }
      }
    }
  }
}
explain format=json
select count(distinct t5.b) as sum from t5, t6
where t5.a=t6.a and t6.b > 0 and t5.a <= 5
group by t5.a order by sum limit 1;
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "filesort": {
      "sort_key": "count(distinct t5.b)",
      "temporary_table": {
        "filesort": {
          "sort_key": "t5.a",
          "temporary_table": {
            "table": {
              "table_name": "t6",
              "access_type": "ALL",
              "rows": 5,
              "filtered": 100,
              "attached_condition": "t6.b > 0 and t6.a <= 5"
            },
            "block-nl-join": {
              "table": {
                "table_name": "t5",
                "access_type": "ALL",
                "rows": 7,
                "filtered": 100
              },
              "buffer_type": "flat",
              "buffer_size": "119",
              "join_type": "BNL",
              "attached_condition": "t5.a = t6.a"
            }
          }
        }
      }
    }
  }
}
drop table t5,t6,t7;
drop table t3;
# 
# Tabular ANALYZE must get its data from execution tracker (and not from
#   the query plan)
# 
CREATE TABLE t2(
col1 int, 
col2 int, 
UNIQUE INDEX idx (col1, col2)) engine=myisam;
INSERT INTO t2(col1, col2) VALUES
(1,20),(2,19),(3,18),(4,17),(5,16),(6,15),(7,14),(8,13),(9,12),(10,11),
(11,10),(12,9),(13,8),(14,7),(15,6),(16,5),(17,4),(18,3),(19,2),(20,1);
flush status;
explain
select col1 f1, col2 f2, col1 f3 from t2 group by f1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t2	range	NULL	idx	5	NULL	7	Using index for group-by
analyze
select col1 f1, col2 f2, col1 f3 from t2 group by f1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
1	SIMPLE	t2	range	NULL	idx	5	NULL	7	20.00	100.00	100.00	Using index for group-by
analyze format=json
select col1 f1, col2 f2, col1 f3 from t2 group by f1;
ANALYZE
{
  "query_block": {
    "select_id": 1,
    "r_loops": 1,
    "r_total_time_ms": "REPLACED",
    "table": {
      "table_name": "t2",
      "access_type": "range",
      "key": "idx",
      "key_length": "5",
      "used_key_parts": ["col1"],
      "r_loops": 1,
      "rows": 7,
      "r_rows": 20,
      "r_table_time_ms": "REPLACED",
      "r_other_time_ms": "REPLACED",
      "filtered": 100,
      "r_filtered": 100,
      "using_index_for_group_by": true
    }
  }
}
drop table t2;
drop table t0,t1;