drop table if exists t0,t1,t2,t3;
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 from t0 A, t0 B;
create table t2 (pk int primary key, a datetime, b date, key(a), key(b));
insert into t2
select
A.a*10+B.a,
date_add(date_add('2017-01-01', interval A.a*8 day), interval B.a hour),
date_add('2017-01-01', interval A.a*7 day)
from t1 A, t0 B;
analyze table t2;
Table	Op	Msg_type	Msg_text
test.t2	analyze	status	Engine-independent statistics collected
test.t2	analyze	status	Table is already up to date
#
# "YEAR(datetime_col) CMP year_value", basic checks
#
select count(*) from t2 where year(a) < 2018;
count(*)
460
# Compare the results, they must be equal:
select count(*) from t2 where a < '2018-01-01';
count(*)
460
explain format=json select count(*) from t2 where year(a) < 2018;
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.063940854,
    "nested_loop": [
      {
        "table": {
          "table_name": "t2",
          "access_type": "range",
          "possible_keys": ["a"],
          "key": "a",
          "key_length": "6",
          "used_key_parts": ["a"],
          "loops": 1,
          "rows": 451,
          "cost": 0.063940854,
          "filtered": 100,
          "attached_condition": "t2.a < '2018-01-01 00:00:00'",
          "using_index": true
        }
      }
    ]
  }
}
# Check rewrite for a prepared statement:
execute immediate 
"explain format=json select * from t2 where year(a) < ?"
  using 2018;
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.1671618,
    "nested_loop": [
      {
        "table": {
          "table_name": "t2",
          "access_type": "ALL",
          "possible_keys": ["a"],
          "loops": 1,
          "rows": 1000,
          "cost": 0.1671618,
          "filtered": 45.09999847,
          "attached_condition": "t2.a < '2018-01-01 00:00:00'"
        }
      }
    ]
  }
}
prepare stmt from "select count(*) from t2 where year(a) < 2018";
execute stmt;
count(*)
460
execute stmt;
count(*)
460
create or replace view v1 as select count(*) from t2 where year(a) < 2018;
select * from v1;
count(*)
460
create or replace procedure sp() select count(*) from t2 where year(a) < 2018;
call sp();
count(*)
460
call sp();
count(*)
460
# Prepared statement with a placeholder
prepare stmt from "select count(*) from t2 where year(a) < ?";
execute stmt using 2018;
count(*)
460
execute stmt using 2017;
count(*)
0
select count(*) from t2 where year(a) <= 2018;
count(*)
920
select count(*) from t2 where a < '2019-01-01';
count(*)
920
explain format=json select count(*) from t2 where year(a) <= 2018;
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.126438894,
    "nested_loop": [
      {
        "table": {
          "table_name": "t2",
          "access_type": "range",
          "possible_keys": ["a"],
          "key": "a",
          "key_length": "6",
          "used_key_parts": ["a"],
          "loops": 1,
          "rows": 903,
          "cost": 0.126438894,
          "filtered": 100,
          "attached_condition": "t2.a <= '2018-12-31 23:59:59'",
          "using_index": true
        }
      }
    ]
  }
}
select count(*) from t2 where year(a) > 2018;
count(*)
80
select count(*) from t2 where a > '2018-12-31 23:59:59.999999';
count(*)
80
explain format=json select count(*) from t2 where year(a) > 2018;
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.014752874,
    "nested_loop": [
      {
        "table": {
          "table_name": "t2",
          "access_type": "range",
          "possible_keys": ["a"],
          "key": "a",
          "key_length": "6",
          "used_key_parts": ["a"],
          "loops": 1,
          "rows": 97,
          "cost": 0.014752874,
          "filtered": 100,
          "attached_condition": "t2.a > '2018-12-31 23:59:59'",
          "using_index": true
        }
      }
    ]
  }
}
select count(*) from t2 where year(a) >= 2018;
count(*)
540
select count(*) from t2 where a >= '2018-01-01';
count(*)
540
explain format=json select count(*) from t2 where year(a) >= 2018;
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.077250914,
    "nested_loop": [
      {
        "table": {
          "table_name": "t2",
          "access_type": "range",
          "possible_keys": ["a"],
          "key": "a",
          "key_length": "6",
          "used_key_parts": ["a"],
          "loops": 1,
          "rows": 549,
          "cost": 0.077250914,
          "filtered": 100,
          "attached_condition": "t2.a >= '2018-01-01 00:00:00'",
          "using_index": true
        }
      }
    ]
  }
}
select count(*) from t2 where year(a) = 2017;
count(*)
460
select count(*) from t2 where a >= '2017-01-01' and a < '2018-01-01';
count(*)
460
explain format=json select count(*) from t2 where year(a) = 2017;
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.063940854,
    "nested_loop": [
      {
        "table": {
          "table_name": "t2",
          "access_type": "range",
          "possible_keys": ["a"],
          "key": "a",
          "key_length": "6",
          "used_key_parts": ["a"],
          "loops": 1,
          "rows": 451,
          "cost": 0.063940854,
          "filtered": 100,
          "attached_condition": "t2.a between '2017-01-01 00:00:00' and '2017-12-31 23:59:59'",
          "using_index": true
        }
      }
    ]
  }
}
#
# "YEAR(datetime_col) CMP year_value", reverse argument order
#
select count(*) from t2 where 2017 < year(a);
count(*)
540
select count(*) from t2 where a >= '2018-01-01';
count(*)
540
explain format=json select count(*) from t2 where 2017 < year(a);
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.077250914,
    "nested_loop": [
      {
        "table": {
          "table_name": "t2",
          "access_type": "range",
          "possible_keys": ["a"],
          "key": "a",
          "key_length": "6",
          "used_key_parts": ["a"],
          "loops": 1,
          "rows": 549,
          "cost": 0.077250914,
          "filtered": 100,
          "attached_condition": "t2.a > '2017-12-31 23:59:59'",
          "using_index": true
        }
      }
    ]
  }
}
select count(*) from t2 where a >= '2018-01-01';
count(*)
540
explain format=json select count(*) from t2 where 2018 <= year(a);
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.077250914,
    "nested_loop": [
      {
        "table": {
          "table_name": "t2",
          "access_type": "range",
          "possible_keys": ["a"],
          "key": "a",
          "key_length": "6",
          "used_key_parts": ["a"],
          "loops": 1,
          "rows": 549,
          "cost": 0.077250914,
          "filtered": 100,
          "attached_condition": "t2.a >= '2018-01-01 00:00:00'",
          "using_index": true
        }
      }
    ]
  }
}
select count(*) from t2 where 2018 > year(a);
count(*)
460
select count(*) from t2 where a < '2018-01-01';
count(*)
460
explain format=json select count(*) from t2 where 2018 > year(a);
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.063940854,
    "nested_loop": [
      {
        "table": {
          "table_name": "t2",
          "access_type": "range",
          "possible_keys": ["a"],
          "key": "a",
          "key_length": "6",
          "used_key_parts": ["a"],
          "loops": 1,
          "rows": 451,
          "cost": 0.063940854,
          "filtered": 100,
          "attached_condition": "t2.a < '2018-01-01 00:00:00'",
          "using_index": true
        }
      }
    ]
  }
}
select count(*) from t2 where a < '2019-01-01';
count(*)
920
explain format=json select count(*) from t2 where 2018 >= year(a);
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.126438894,
    "nested_loop": [
      {
        "table": {
          "table_name": "t2",
          "access_type": "range",
          "possible_keys": ["a"],
          "key": "a",
          "key_length": "6",
          "used_key_parts": ["a"],
          "loops": 1,
          "rows": 903,
          "cost": 0.126438894,
          "filtered": 100,
          "attached_condition": "t2.a <= '2018-12-31 23:59:59'",
          "using_index": true
        }
      }
    ]
  }
}
select count(*) from t2 where 2018 =  year(a);
count(*)
460
select count(*) from t2 where a >= '2018-01-01' and a < '2019-01-01';
count(*)
460
explain format=json select count(*) from t2 where 2018 =  year(a);
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.064079124,
    "nested_loop": [
      {
        "table": {
          "table_name": "t2",
          "access_type": "range",
          "possible_keys": ["a"],
          "key": "a",
          "key_length": "6",
          "used_key_parts": ["a"],
          "loops": 1,
          "rows": 452,
          "cost": 0.064079124,
          "filtered": 100,
          "attached_condition": "t2.a between '2018-01-01 00:00:00' and '2018-12-31 23:59:59'",
          "using_index": true
        }
      }
    ]
  }
}
#
# "DATE(datetime_col) CMP date_value", basic checks
#
select count(*) from t2 where date(a) < '2017-06-01';
count(*)
190
select count(*) from t2 where a < '2017-06-01';
count(*)
190
explain format=json select count(*) from t2 where date(a) < '2017-06-01';
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.027058904,
    "nested_loop": [
      {
        "table": {
          "table_name": "t2",
          "access_type": "range",
          "possible_keys": ["a"],
          "key": "a",
          "key_length": "6",
          "used_key_parts": ["a"],
          "loops": 1,
          "rows": 186,
          "cost": 0.027058904,
          "filtered": 100,
          "attached_condition": "t2.a < '2017-06-01 00:00:00'",
          "using_index": true
        }
      }
    ]
  }
}
select count(*) from t2 where date(a) <= '2017-06-03';
count(*)
200
select count(*) from t2 where a < '2017-06-04';
count(*)
200
explain format=json select count(*) from t2 where date(a) <= '2017-06-03';
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.028441604,
    "nested_loop": [
      {
        "table": {
          "table_name": "t2",
          "access_type": "range",
          "possible_keys": ["a"],
          "key": "a",
          "key_length": "6",
          "used_key_parts": ["a"],
          "loops": 1,
          "rows": 196,
          "cost": 0.028441604,
          "filtered": 100,
          "attached_condition": "t2.a <= '2017-06-03 23:59:59'",
          "using_index": true
        }
      }
    ]
  }
}
select count(*) from t2 where date(a) > '2018-06-01';
count(*)
350
select count(*) from t2 where a >= '2018-06-02';
count(*)
350
explain format=json select count(*) from t2 where date(a) > '2018-06-01';
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.051773094,
    "nested_loop": [
      {
        "table": {
          "table_name": "t2",
          "access_type": "range",
          "possible_keys": ["a"],
          "key": "a",
          "key_length": "6",
          "used_key_parts": ["a"],
          "loops": 1,
          "rows": 363,
          "cost": 0.051773094,
          "filtered": 100,
          "attached_condition": "t2.a > '2018-06-01 23:59:59'",
          "using_index": true
        }
      }
    ]
  }
}
select count(*) from t2 where date(a) >= '2018-06-01';
count(*)
350
select count(*) from t2 where a >= '2018-06-01';
count(*)
350
explain format=json select count(*) from t2 where date(a) >= '2018-06-01';
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.051773094,
    "nested_loop": [
      {
        "table": {
          "table_name": "t2",
          "access_type": "range",
          "possible_keys": ["a"],
          "key": "a",
          "key_length": "6",
          "used_key_parts": ["a"],
          "loops": 1,
          "rows": 363,
          "cost": 0.051773094,
          "filtered": 100,
          "attached_condition": "t2.a >= '2018-06-01 00:00:00'",
          "using_index": true
        }
      }
    ]
  }
}
select count(*) from t2 where date(a) = '2017-06-02';
count(*)
10
select count(*) from t2 where a >= '2017-06-02' and a < '2017-06-03';
count(*)
10
explain format=json select count(*) from t2 where date(a) = '2017-06-02';
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.002723384,
    "nested_loop": [
      {
        "table": {
          "table_name": "t2",
          "access_type": "range",
          "possible_keys": ["a"],
          "key": "a",
          "key_length": "6",
          "used_key_parts": ["a"],
          "loops": 1,
          "rows": 10,
          "cost": 0.002723384,
          "filtered": 100,
          "attached_condition": "t2.a between '2017-06-02 00:00:00' and '2017-06-02 23:59:59'",
          "using_index": true
        }
      }
    ]
  }
}
#
# "DATE(datetime_col) CMP date_value", reverse order
#
select count(*) from t2 where '2017-06-01' > date(a);
count(*)
190
select count(*) from t2 where '2017-06-01' > a;
count(*)
190
explain format=json select count(*) from t2 where '2017-06-01' > date(a);
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.027058904,
    "nested_loop": [
      {
        "table": {
          "table_name": "t2",
          "access_type": "range",
          "possible_keys": ["a"],
          "key": "a",
          "key_length": "6",
          "used_key_parts": ["a"],
          "loops": 1,
          "rows": 186,
          "cost": 0.027058904,
          "filtered": 100,
          "attached_condition": "t2.a < '2017-06-01 00:00:00'",
          "using_index": true
        }
      }
    ]
  }
}
select count(*) from t2 where '2017-06-03' >= date(a);
count(*)
200
select count(*) from t2 where '2017-06-03' >= a;
count(*)
200
explain format=json select count(*) from t2 where '2017-06-03' >= date(a);
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.028441604,
    "nested_loop": [
      {
        "table": {
          "table_name": "t2",
          "access_type": "range",
          "possible_keys": ["a"],
          "key": "a",
          "key_length": "6",
          "used_key_parts": ["a"],
          "loops": 1,
          "rows": 196,
          "cost": 0.028441604,
          "filtered": 100,
          "attached_condition": "t2.a <= '2017-06-03 23:59:59'",
          "using_index": true
        }
      }
    ]
  }
}
select count(*) from t2 where '2018-06-01' < date(a);
count(*)
350
select count(*) from t2 where '2018-06-02' <= a;
count(*)
350
explain format=json select count(*) from t2 where '2018-06-01' < date(a);
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.051773094,
    "nested_loop": [
      {
        "table": {
          "table_name": "t2",
          "access_type": "range",
          "possible_keys": ["a"],
          "key": "a",
          "key_length": "6",
          "used_key_parts": ["a"],
          "loops": 1,
          "rows": 363,
          "cost": 0.051773094,
          "filtered": 100,
          "attached_condition": "t2.a > '2018-06-01 23:59:59'",
          "using_index": true
        }
      }
    ]
  }
}
select count(*) from t2 where '2018-06-01' <= date(a);
count(*)
350
select count(*) from t2 where '2018-06-01' <= a;
count(*)
350
explain format=json select count(*) from t2 where '2018-06-01' <= date(a);
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.051773094,
    "nested_loop": [
      {
        "table": {
          "table_name": "t2",
          "access_type": "range",
          "possible_keys": ["a"],
          "key": "a",
          "key_length": "6",
          "used_key_parts": ["a"],
          "loops": 1,
          "rows": 363,
          "cost": 0.051773094,
          "filtered": 100,
          "attached_condition": "t2.a >= '2018-06-01 00:00:00'",
          "using_index": true
        }
      }
    ]
  }
}
select count(*) from t2 where '2017-06-02' = date(a);
count(*)
10
select count(*) from t2 where a >= '2017-06-02' and a < '2017-06-03';
count(*)
10
explain format=json select count(*) from t2 where '2017-06-02' = date(a);
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.002723384,
    "nested_loop": [
      {
        "table": {
          "table_name": "t2",
          "access_type": "range",
          "possible_keys": ["a"],
          "key": "a",
          "key_length": "6",
          "used_key_parts": ["a"],
          "loops": 1,
          "rows": 10,
          "cost": 0.002723384,
          "filtered": 100,
          "attached_condition": "t2.a between '2017-06-02 00:00:00' and '2017-06-02 23:59:59'",
          "using_index": true
        }
      }
    ]
  }
}
# Check rewrite of a more complicated query
explain format=json select * from t2 as t21 force index(a),
t2 as t22 force index(a)
where year(t21.a) < 2018 and t21.b > '2017-11-01'
  and date(t22.a) >= '2017-02-01' and t22.b > '2017-11-01';
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 300.4906324,
    "nested_loop": [
      {
        "table": {
          "table_name": "t21",
          "access_type": "range",
          "possible_keys": ["a"],
          "key": "a",
          "key_length": "6",
          "used_key_parts": ["a"],
          "loops": 1,
          "rows": 451,
          "cost": 0.558056003,
          "filtered": 56,
          "index_condition": "t21.a < '2018-01-01 00:00:00'",
          "attached_condition": "t21.b > '2017-11-01'"
        }
      },
      {
        "block-nl-join": {
          "table": {
            "table_name": "t22",
            "access_type": "range",
            "possible_keys": ["a"],
            "key": "a",
            "key_length": "6",
            "used_key_parts": ["a"],
            "loops": 252.56,
            "rows": 961,
            "cost": 299.9325764,
            "filtered": 56,
            "index_condition": "t22.a >= '2017-02-01 00:00:00'",
            "attached_condition": "t22.a >= '2017-02-01 00:00:00' and t22.b > '2017-11-01'"
          },
          "buffer_type": "flat",
          "buffer_size": "7Kb",
          "join_type": "BNL",
          "attached_condition": "t22.b > '2017-11-01'"
        }
      }
    ]
  }
}
#
# Incorrect const values processing (no rewrite is possible)
#
explain format=json select * from t2 where year(a) = -1;
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.1671618,
    "nested_loop": [
      {
        "table": {
          "table_name": "t2",
          "access_type": "ALL",
          "loops": 1,
          "rows": 1000,
          "cost": 0.1671618,
          "filtered": 100,
          "attached_condition": "year(t2.a) = -1"
        }
      }
    ]
  }
}
explain format=json select * from t2 where year(a) > -5;
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.1671618,
    "nested_loop": [
      {
        "table": {
          "table_name": "t2",
          "access_type": "ALL",
          "loops": 1,
          "rows": 1000,
          "cost": 0.1671618,
          "filtered": 100,
          "attached_condition": "year(t2.a) > -5"
        }
      }
    ]
  }
}
explain format=json select * from t2 where year(a) < -1;
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.1671618,
    "nested_loop": [
      {
        "table": {
          "table_name": "t2",
          "access_type": "ALL",
          "loops": 1,
          "rows": 1000,
          "cost": 0.1671618,
          "filtered": 100,
          "attached_condition": "year(t2.a) < -1"
        }
      }
    ]
  }
}
explain format=json select * from t2 where year(a) <= 10000;
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.1671618,
    "nested_loop": [
      {
        "table": {
          "table_name": "t2",
          "access_type": "ALL",
          "loops": 1,
          "rows": 1000,
          "cost": 0.1671618,
          "filtered": 100,
          "attached_condition": "year(t2.a) <= 10000"
        }
      }
    ]
  }
}
explain format=json select * from t2 where year(a) >= 10020;
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.1671618,
    "nested_loop": [
      {
        "table": {
          "table_name": "t2",
          "access_type": "ALL",
          "loops": 1,
          "rows": 1000,
          "cost": 0.1671618,
          "filtered": 100,
          "attached_condition": "year(t2.a) >= 10020"
        }
      }
    ]
  }
}
explain format=json select * from t2 where date(a) = '10000-01-01';
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.1671618,
    "nested_loop": [
      {
        "table": {
          "table_name": "t2",
          "access_type": "ALL",
          "loops": 1,
          "rows": 1000,
          "cost": 0.1671618,
          "filtered": 100,
          "attached_condition": "cast(t2.a as date) = '10000-01-01'"
        }
      }
    ]
  }
}
Warnings:
Warning	1292	Incorrect datetime value: '10000-01-01'
explain format=json select * from t2 where date(a) < '-1-01-01';
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.1671618,
    "nested_loop": [
      {
        "table": {
          "table_name": "t2",
          "access_type": "ALL",
          "loops": 1,
          "rows": 1000,
          "cost": 0.1671618,
          "filtered": 100,
          "attached_condition": "cast(t2.a as date) < '-1-01-01'"
        }
      }
    ]
  }
}
Warnings:
Warning	1292	Incorrect datetime value: '-1-01-01'
#
# Try DATE function and DATE (not DATETIME) column:
#
select count(*) from t2 where date(b)< '2017-06-03';
count(*)
220
select count(*) from t2 where b < '2017-06-03';
count(*)
220
explain format=json select count(*) from t2 where date(b)< '2017-06-03';
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.031207004,
    "nested_loop": [
      {
        "table": {
          "table_name": "t2",
          "access_type": "range",
          "possible_keys": ["b"],
          "key": "b",
          "key_length": "4",
          "used_key_parts": ["b"],
          "loops": 1,
          "rows": 216,
          "cost": 0.031207004,
          "filtered": 100,
          "attached_condition": "t2.b < '2017-06-03'",
          "using_index": true
        }
      }
    ]
  }
}
select count(*) from t2 where date(b)= '2017-06-04';
count(*)
10
select count(*) from t2 where b >= '2017-06-04' and b < '2017-06-05';
count(*)
10
explain format=json select count(*) from t2 where date(b)= '2017-06-04';
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.002723384,
    "nested_loop": [
      {
        "table": {
          "table_name": "t2",
          "access_type": "range",
          "possible_keys": ["b"],
          "key": "b",
          "key_length": "4",
          "used_key_parts": ["b"],
          "loops": 1,
          "rows": 10,
          "cost": 0.002723384,
          "filtered": 100,
          "attached_condition": "t2.b between '2017-06-04' and '2017-06-04'",
          "using_index": true
        }
      }
    ]
  }
}
#
# Check actual query results
#
insert into t2 values (10001,'2006-12-31 23:59:59','2006-12-31');
insert into t2 values (10002,'2007-01-01 00:00:00','2007-01-01');
insert into t2 values (10003,'2007-12-31 23:59:59','2007-12-31');
insert into t2 values (10004,'2008-01-01 00:00:00','2008-01-01');
explain format=json
select * from t2 force index(b) where year(b)=2007;
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.005042291,
    "nested_loop": [
      {
        "table": {
          "table_name": "t2",
          "access_type": "range",
          "possible_keys": ["b"],
          "key": "b",
          "key_length": "4",
          "used_key_parts": ["b"],
          "loops": 1,
          "rows": 3,
          "cost": 0.005042291,
          "filtered": 100,
          "index_condition": "t2.b between '2007-01-01' and '2007-12-31'"
        }
      }
    ]
  }
}
select * from t2 force index(b) where year(b)=2007;
pk	a	b
10002	2007-01-01 00:00:00	2007-01-01
10003	2007-12-31 23:59:59	2007-12-31
insert into t2 values (10010,'2006-12-31 00:00:00','2006-12-31');
insert into t2 values (10011,'2006-12-30 23:59:59','2006-12-30');
explain format=json
select * from t2 force index(a) where date(a)='2006-12-31';
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.005042291,
    "nested_loop": [
      {
        "table": {
          "table_name": "t2",
          "access_type": "range",
          "possible_keys": ["a"],
          "key": "a",
          "key_length": "6",
          "used_key_parts": ["a"],
          "loops": 1,
          "rows": 3,
          "cost": 0.005042291,
          "filtered": 100,
          "index_condition": "t2.a between '2006-12-31 00:00:00' and '2006-12-31 23:59:59'"
        }
      }
    ]
  }
}
select * from t2 force index(a) where date(a)='2006-12-31';
pk	a	b
10010	2006-12-31 00:00:00	2006-12-31
10001	2006-12-31 23:59:59	2006-12-31
#
# Test the TIMESTAMP column
#
create table t3 (a timestamp, b date, key(a));
# Insert data starting from 2016 since that year had a leap second
# (https://en.wikipedia.org/wiki/Leap_second)
set time_zone="UTC";
insert into t3
select
timestampadd(hour, B.a, date_add('2016-01-01', interval A.a*8 day)),
date_add('2016-01-01', interval A.a*7 day)
from t1 A, t0 B;
# Results of those two queries must be equal:
select count(*) from t3 force index(a) where year(a)= 2016;
count(*)
460
# The result must be the same as this query's:
select count(*) from t3 force index(a) where a >= '2016-01-01 00:00:00'
    and a <= '2016-12-31 23:59:59.999999';
count(*)
460
explain format=json
select count(*) from t3 force index(a) where year(a)= 2016;
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.064493934,
    "nested_loop": [
      {
        "table": {
          "table_name": "t3",
          "access_type": "range",
          "possible_keys": ["a"],
          "key": "a",
          "key_length": "5",
          "used_key_parts": ["a"],
          "loops": 1,
          "rows": 455,
          "cost": 0.064493934,
          "filtered": 100,
          "attached_condition": "t3.a between '2016-01-01 00:00:00' and '2016-12-31 23:59:59'",
          "using_index": true
        }
      }
    ]
  }
}
set time_zone= @@global.time_zone;
#
# Incorrect const values processing (no rewrite is possible)
#
explain format=json select * from t2 where year(a) = -1;
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.1671618,
    "nested_loop": [
      {
        "table": {
          "table_name": "t2",
          "access_type": "ALL",
          "loops": 1,
          "rows": 1000,
          "cost": 0.1671618,
          "filtered": 100,
          "attached_condition": "year(t2.a) = -1"
        }
      }
    ]
  }
}
explain format=json select * from t2 where year(a) > -5;
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.1671618,
    "nested_loop": [
      {
        "table": {
          "table_name": "t2",
          "access_type": "ALL",
          "loops": 1,
          "rows": 1000,
          "cost": 0.1671618,
          "filtered": 100,
          "attached_condition": "year(t2.a) > -5"
        }
      }
    ]
  }
}
explain format=json select * from t2 where year(a) < -1;
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.1671618,
    "nested_loop": [
      {
        "table": {
          "table_name": "t2",
          "access_type": "ALL",
          "loops": 1,
          "rows": 1000,
          "cost": 0.1671618,
          "filtered": 100,
          "attached_condition": "year(t2.a) < -1"
        }
      }
    ]
  }
}
explain format=json select * from t2 where year(a) <= 10000;
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.1671618,
    "nested_loop": [
      {
        "table": {
          "table_name": "t2",
          "access_type": "ALL",
          "loops": 1,
          "rows": 1000,
          "cost": 0.1671618,
          "filtered": 100,
          "attached_condition": "year(t2.a) <= 10000"
        }
      }
    ]
  }
}
explain format=json select * from t2 where year(a) >= 10020;
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.1671618,
    "nested_loop": [
      {
        "table": {
          "table_name": "t2",
          "access_type": "ALL",
          "loops": 1,
          "rows": 1000,
          "cost": 0.1671618,
          "filtered": 100,
          "attached_condition": "year(t2.a) >= 10020"
        }
      }
    ]
  }
}
explain format=json select * from t2 where date(a) = '10000-01-01';
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.1671618,
    "nested_loop": [
      {
        "table": {
          "table_name": "t2",
          "access_type": "ALL",
          "loops": 1,
          "rows": 1000,
          "cost": 0.1671618,
          "filtered": 100,
          "attached_condition": "cast(t2.a as date) = '10000-01-01'"
        }
      }
    ]
  }
}
Warnings:
Warning	1292	Incorrect datetime value: '10000-01-01'
explain format=json select * from t2 where date(a) < '-1-01-01';
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.1671618,
    "nested_loop": [
      {
        "table": {
          "table_name": "t2",
          "access_type": "ALL",
          "loops": 1,
          "rows": 1000,
          "cost": 0.1671618,
          "filtered": 100,
          "attached_condition": "cast(t2.a as date) < '-1-01-01'"
        }
      }
    ]
  }
}
Warnings:
Warning	1292	Incorrect datetime value: '-1-01-01'
#
# Composite indexes
#
create table t4 (a datetime, b int, key(a, b)) ;
insert into t4 values ('2009-11-29 13:43:32', 2);
insert into t4 values ('2009-10-15 12:15:11', 2);
insert into t4 values ('2009-09-01 15:55:00', 3);
insert into t4 values ('2009-08-23 12:07:47', 4);
explain format=json select * from t4 where year(a) = 2009;
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.001893764,
    "nested_loop": [
      {
        "table": {
          "table_name": "t4",
          "access_type": "range",
          "possible_keys": ["a"],
          "key": "a",
          "key_length": "6",
          "used_key_parts": ["a"],
          "loops": 1,
          "rows": 4,
          "cost": 0.001893764,
          "filtered": 100,
          "attached_condition": "t4.a between '2009-01-01 00:00:00' and '2009-12-31 23:59:59'",
          "using_index": true
        }
      }
    ]
  }
}
explain format=json select * from t4 where year(a) >= 2009;
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.001893764,
    "nested_loop": [
      {
        "table": {
          "table_name": "t4",
          "access_type": "range",
          "possible_keys": ["a"],
          "key": "a",
          "key_length": "6",
          "used_key_parts": ["a"],
          "loops": 1,
          "rows": 4,
          "cost": 0.001893764,
          "filtered": 100,
          "attached_condition": "t4.a >= '2009-01-01 00:00:00'",
          "using_index": true
        }
      }
    ]
  }
}
explain format=json select * from t4 where year(a) < 2018;
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.001893764,
    "nested_loop": [
      {
        "table": {
          "table_name": "t4",
          "access_type": "range",
          "possible_keys": ["a"],
          "key": "a",
          "key_length": "6",
          "used_key_parts": ["a"],
          "loops": 1,
          "rows": 4,
          "cost": 0.001893764,
          "filtered": 100,
          "attached_condition": "t4.a < '2018-01-01 00:00:00'",
          "using_index": true
        }
      }
    ]
  }
}
explain format=json select * from t4 where date(a) = '2009-12-01';
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.001478954,
    "nested_loop": [
      {
        "table": {
          "table_name": "t4",
          "access_type": "range",
          "possible_keys": ["a"],
          "key": "a",
          "key_length": "6",
          "used_key_parts": ["a"],
          "loops": 1,
          "rows": 1,
          "cost": 0.001478954,
          "filtered": 100,
          "attached_condition": "t4.a between '2009-12-01 00:00:00' and '2009-12-01 23:59:59'",
          "using_index": true
        }
      }
    ]
  }
}
explain format=json select * from t4 where b = 2 and year(a) = 2009;
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.001893764,
    "nested_loop": [
      {
        "table": {
          "table_name": "t4",
          "access_type": "range",
          "possible_keys": ["a"],
          "key": "a",
          "key_length": "11",
          "used_key_parts": ["a", "b"],
          "loops": 1,
          "rows": 4,
          "cost": 0.001893764,
          "filtered": 100,
          "attached_condition": "t4.b = 2 and t4.a between '2009-01-01 00:00:00' and '2009-12-31 23:59:59'",
          "using_index": true
        }
      }
    ]
  }
}
explain format=json select * from t4 where b = 10 and year(a) > 2001;
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.001893764,
    "nested_loop": [
      {
        "table": {
          "table_name": "t4",
          "access_type": "range",
          "possible_keys": ["a"],
          "key": "a",
          "key_length": "6",
          "used_key_parts": ["a"],
          "loops": 1,
          "rows": 4,
          "cost": 0.001893764,
          "filtered": 100,
          "attached_condition": "t4.b = 10 and t4.a > '2001-12-31 23:59:59'",
          "using_index": true
        }
      }
    ]
  }
}
explain format=json select * from t4 where b = 2 and date(a) = '2009-11-02';
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.001478954,
    "nested_loop": [
      {
        "table": {
          "table_name": "t4",
          "access_type": "range",
          "possible_keys": ["a"],
          "key": "a",
          "key_length": "11",
          "used_key_parts": ["a", "b"],
          "loops": 1,
          "rows": 1,
          "cost": 0.001478954,
          "filtered": 100,
          "attached_condition": "t4.b = 2 and t4.a between '2009-11-02 00:00:00' and '2009-11-02 23:59:59'",
          "using_index": true
        }
      }
    ]
  }
}
# Reverse order of fields in the index
create table t5 (a datetime, b int, c varchar(20), key(b, a));
insert into t5 values ('2009-11-29 13:43:32', 2, 'abc');
insert into t5 values ('2009-10-15 12:15:11', 2, 'def');
insert into t5 values ('2009-09-01 15:55:00', 3, 'gfd');
insert into t5 values ('2009-08-23 12:07:47', 4, 'xyz');
explain format=json select * from t5 where year(a) = 2009;
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.01066122,
    "nested_loop": [
      {
        "table": {
          "table_name": "t5",
          "access_type": "ALL",
          "loops": 1,
          "rows": 4,
          "cost": 0.01066122,
          "filtered": 100,
          "attached_condition": "t5.a between <cache>('2009-01-01 00:00:00') and <cache>('2009-12-31 23:59:59')"
        }
      }
    ]
  }
}
explain format=json select * from t4 where date(a) = '2009-12-01';
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.001478954,
    "nested_loop": [
      {
        "table": {
          "table_name": "t4",
          "access_type": "range",
          "possible_keys": ["a"],
          "key": "a",
          "key_length": "6",
          "used_key_parts": ["a"],
          "loops": 1,
          "rows": 1,
          "cost": 0.001478954,
          "filtered": 100,
          "attached_condition": "t4.a between '2009-12-01 00:00:00' and '2009-12-01 23:59:59'",
          "using_index": true
        }
      }
    ]
  }
}
explain format=json select * from t5 where b = 2 and year(a) = 2009;
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.002037211,
    "nested_loop": [
      {
        "table": {
          "table_name": "t5",
          "access_type": "range",
          "possible_keys": ["b"],
          "key": "b",
          "key_length": "11",
          "used_key_parts": ["b", "a"],
          "loops": 1,
          "rows": 2,
          "cost": 0.002037211,
          "filtered": 70,
          "index_condition": "t5.b = 2 and t5.a between '2009-01-01 00:00:00' and '2009-12-31 23:59:59'"
        }
      }
    ]
  }
}
explain format=json select * from t5 where b = 10 and year(a) > 2001;
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.002574553,
    "nested_loop": [
      {
        "table": {
          "table_name": "t5",
          "access_type": "range",
          "possible_keys": ["b"],
          "key": "b",
          "key_length": "11",
          "used_key_parts": ["b", "a"],
          "loops": 1,
          "rows": 1,
          "cost": 0.002574553,
          "filtered": 100,
          "index_condition": "t5.b = 10 and t5.a > '2001-12-31 23:59:59'"
        }
      }
    ]
  }
}
explain format=json select * from t5 where b = 3 and date(a) > '2009-09-01';
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.002574553,
    "nested_loop": [
      {
        "table": {
          "table_name": "t5",
          "access_type": "range",
          "possible_keys": ["b"],
          "key": "b",
          "key_length": "11",
          "used_key_parts": ["b", "a"],
          "loops": 1,
          "rows": 1,
          "cost": 0.002574553,
          "filtered": 100,
          "index_condition": "t5.b = 3 and t5.a > '2009-09-01 23:59:59'"
        }
      }
    ]
  }
}
#
# No rewrite for a non-indexed column
#
create table t6 (a datetime);
insert into t6 values ('2009-11-29 13:43:32');
insert into t6 values ('2009-10-15 12:15:11');
insert into t6 values ('2009-09-01 15:55:00');
insert into t6 values ('2009-08-23 12:07:47');
explain format=json select * from t6 where year(a) = 2009;
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.01066122,
    "nested_loop": [
      {
        "table": {
          "table_name": "t6",
          "access_type": "ALL",
          "loops": 1,
          "rows": 4,
          "cost": 0.01066122,
          "filtered": 100,
          "attached_condition": "year(t6.a) = 2009"
        }
      }
    ]
  }
}
explain format=json select * from t6 where date(a) = '2009-12-01';
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.01066122,
    "nested_loop": [
      {
        "table": {
          "table_name": "t6",
          "access_type": "ALL",
          "loops": 1,
          "rows": 4,
          "cost": 0.01066122,
          "filtered": 100,
          "attached_condition": "cast(t6.a as date) = '2009-12-01'"
        }
      }
    ]
  }
}
drop table t0,t1,t2,t3,t4,t5,t6;
drop view v1;
drop procedure sp;
#
# MDEV-30946 Index usage for DATE(datetime_column) = const
#            does not work for DELETE and UPDATE
#
create table t1 (pk int primary key, a datetime, c int, key(a));
insert into t1 (pk,a,c) values (1,'2009-11-29 13:43:32', 2);
insert into t1 (pk,a,c) values (2,'2009-11-29 03:23:32', 2);
insert into t1 (pk,a,c) values (3,'2009-10-16 05:56:32', 2);
insert into t1 (pk,a,c) values (4,'2010-11-29 13:43:32', 2);
insert into t1 (pk,a,c) values (5,'2010-10-16 05:56:32', 2);
insert into t1 (pk,a,c) values (6,'2011-11-29 13:43:32', 2);
insert into t1 (pk,a,c) values (7,'2012-10-16 05:56:32', 2);
# YEAR() conditions, UPDATE
explain format=json update t1 set c = 0 where year(a) = 2010;
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "table": {
      "update": 1,
      "table_name": "t1",
      "access_type": "range",
      "possible_keys": ["a"],
      "key": "a",
      "key_length": "6",
      "used_key_parts": ["a"],
      "rows": 2,
      "attached_condition": "t1.a between '2010-01-01 00:00:00' and '2010-12-31 23:59:59'"
    }
  }
}
update t1 set c = 0 where year(a) = 2010;
select * from t1;
pk	a	c
1	2009-11-29 13:43:32	2
2	2009-11-29 03:23:32	2
3	2009-10-16 05:56:32	2
4	2010-11-29 13:43:32	0
5	2010-10-16 05:56:32	0
6	2011-11-29 13:43:32	2
7	2012-10-16 05:56:32	2
explain format=json update t1 set c = 1
where c < (select count(*) from t1 where year(a) = 2010);
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.011130435,
    "nested_loop": [
      {
        "table": {
          "table_name": "t1",
          "access_type": "ALL",
          "loops": 1,
          "rows": 7,
          "cost": 0.011130435,
          "filtered": 100,
          "attached_condition": "t1.c < (subquery#2)"
        }
      }
    ],
    "subqueries": [
      {
        "query_block": {
          "select_id": 2,
          "cost": 0.001617224,
          "nested_loop": [
            {
              "table": {
                "table_name": "t1",
                "access_type": "range",
                "possible_keys": ["a"],
                "key": "a",
                "key_length": "6",
                "used_key_parts": ["a"],
                "loops": 1,
                "rows": 2,
                "cost": 0.001617224,
                "filtered": 100,
                "attached_condition": "t1.a between '2010-01-01 00:00:00' and '2010-12-31 23:59:59'",
                "using_index": true
              }
            }
          ]
        }
      }
    ]
  }
}
explain format=json update t1 set c = 0
where year(a) = 2010 and c < (select count(*) from t1 where year(a) = 2010);
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.003808422,
    "nested_loop": [
      {
        "table": {
          "table_name": "t1",
          "access_type": "range",
          "possible_keys": ["a"],
          "key": "a",
          "key_length": "6",
          "used_key_parts": ["a"],
          "loops": 1,
          "rows": 2,
          "cost": 0.003808422,
          "filtered": 100,
          "index_condition": "t1.a between '2010-01-01 00:00:00' and '2010-12-31 23:59:59'",
          "attached_condition": "t1.c < (subquery#2)"
        }
      }
    ],
    "subqueries": [
      {
        "query_block": {
          "select_id": 2,
          "cost": 0.001617224,
          "nested_loop": [
            {
              "table": {
                "table_name": "t1",
                "access_type": "range",
                "possible_keys": ["a"],
                "key": "a",
                "key_length": "6",
                "used_key_parts": ["a"],
                "loops": 1,
                "rows": 2,
                "cost": 0.001617224,
                "filtered": 100,
                "attached_condition": "t1.a between '2010-01-01 00:00:00' and '2010-12-31 23:59:59'",
                "using_index": true
              }
            }
          ]
        }
      }
    ]
  }
}
# Multi-table update
create table t2 (a int);
insert into t2 values (4),(5),(6);
explain format=json update t1, t2 set c = 0
where year(t1.a) = 2010 and t1.c = t2.a;
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.014992165,
    "nested_loop": [
      {
        "table": {
          "table_name": "t1",
          "access_type": "range",
          "possible_keys": ["a"],
          "key": "a",
          "key_length": "6",
          "used_key_parts": ["a"],
          "loops": 1,
          "rows": 2,
          "cost": 0.003808422,
          "filtered": 100,
          "attached_condition": "t1.a between '2010-01-01 00:00:00' and '2010-12-31 23:59:59'"
        }
      },
      {
        "table": {
          "table_name": "t2",
          "access_type": "ALL",
          "loops": 2,
          "rows": 3,
          "cost": 0.011183743,
          "filtered": 100,
          "attached_condition": "t2.a = t1.c"
        }
      }
    ]
  }
}
prepare stmt from "update t1 set c = 0 where year(a) = 2010";
execute stmt;
execute stmt;
# YEAR() conditions, DELETE
explain format=json delete from t1 where year(a) = 2010;
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "table": {
      "delete": 1,
      "table_name": "t1",
      "access_type": "range",
      "possible_keys": ["a"],
      "key": "a",
      "key_length": "6",
      "used_key_parts": ["a"],
      "rows": 2,
      "attached_condition": "t1.a between '2010-01-01 00:00:00' and '2010-12-31 23:59:59'"
    }
  }
}
delete from t1 where year(a) = 2010;
select * from t1;
pk	a	c
1	2009-11-29 13:43:32	2
2	2009-11-29 03:23:32	2
3	2009-10-16 05:56:32	2
6	2011-11-29 13:43:32	2
7	2012-10-16 05:56:32	2
explain format=json delete from t1
where c < (select count(*) from t1 where year(a) = 2010);
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "cost": 0.010817625,
    "nested_loop": [
      {
        "table": {
          "table_name": "t1",
          "access_type": "ALL",
          "loops": 1,
          "rows": 5,
          "cost": 0.010817625,
          "filtered": 100,
          "attached_condition": "t1.c < (subquery#2)"
        }
      }
    ],
    "subqueries": [
      {
        "query_block": {
          "select_id": 2,
          "cost": 0.001478954,
          "nested_loop": [
            {
              "table": {
                "table_name": "t1",
                "access_type": "range",
                "possible_keys": ["a"],
                "key": "a",
                "key_length": "6",
                "used_key_parts": ["a"],
                "loops": 1,
                "rows": 1,
                "cost": 0.001478954,
                "filtered": 100,
                "attached_condition": "t1.a between '2010-01-01 00:00:00' and '2010-12-31 23:59:59'",
                "using_index": true
              }
            }
          ]
        }
      }
    ]
  }
}
delete from t1 where c < (select count(*) from t1 where year(a) = 2010);
prepare stmt from "delete from t1 where year(a) = 2009";
execute stmt;
execute stmt;
select * from t1;
pk	a	c
6	2011-11-29 13:43:32	2
7	2012-10-16 05:56:32	2
# DATE() conditions, UPDATE
explain format=json update t1 set c = 0 where date(a) = '2010-10-16';
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "table": {
      "update": 1,
      "table_name": "t1",
      "access_type": "range",
      "possible_keys": ["a"],
      "key": "a",
      "key_length": "6",
      "used_key_parts": ["a"],
      "rows": 1,
      "attached_condition": "t1.a between '2010-10-16 00:00:00' and '2010-10-16 23:59:59'"
    }
  }
}
explain format=json update t1 set c = 0 where date(a) <= '2011-10-16';
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "table": {
      "update": 1,
      "table_name": "t1",
      "access_type": "range",
      "possible_keys": ["a"],
      "key": "a",
      "key_length": "6",
      "used_key_parts": ["a"],
      "rows": 1,
      "attached_condition": "t1.a <= '2011-10-16 23:59:59'"
    }
  }
}
prepare stmt from "update t1 set c = 3 where date(a) = '2011-11-29'";
execute stmt;
execute stmt;
select * from t1;
pk	a	c
6	2011-11-29 13:43:32	3
7	2012-10-16 05:56:32	2
# DATE() conditions, DELETE
explain format=json delete from t1 where date(a) = '2010-10-16';
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "table": {
      "delete": 1,
      "table_name": "t1",
      "access_type": "range",
      "possible_keys": ["a"],
      "key": "a",
      "key_length": "6",
      "used_key_parts": ["a"],
      "rows": 1,
      "attached_condition": "t1.a between '2010-10-16 00:00:00' and '2010-10-16 23:59:59'"
    }
  }
}
explain format=json delete from t1 where date(a) <= '2011-10-16';
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "table": {
      "delete": 1,
      "table_name": "t1",
      "access_type": "range",
      "possible_keys": ["a"],
      "key": "a",
      "key_length": "6",
      "used_key_parts": ["a"],
      "rows": 1,
      "attached_condition": "t1.a <= '2011-10-16 23:59:59'"
    }
  }
}
prepare stmt from "delete from t1 where date(a) <= '2012-01-01'";
execute stmt;
execute stmt;
select * from t1;
pk	a	c
7	2012-10-16 05:56:32	2
# Test partition pruning
create table t3 (
a datetime,
key(a)
) partition by range(year(a)) (
partition p0 values less than (2022),
partition p1 values less than (MAXVALUE)
);
insert into t3
select date_add('2020-01-01', interval seq*10 day)
from seq_1_to_100;
# Must be only "p0" partition
explain partitions select * from t3 where year(a) = 2020;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t3	p0	range	a	a	6	NULL	36	Using where; Using index
explain partitions delete from t3 where year(a) = 2020;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t3	p0	ALL	a	NULL	NULL	NULL	73	Using where
explain partitions update t3 set a = a + 1 where year(a) = 2020;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t3	p0	ALL	a	NULL	NULL	NULL	73	Using where; Using buffer
drop tables t1,t2,t3;