Bug#46362: Endpoint should be set to false for TO_DAYS(DATE)

There were a problem since pruning uses the field
for comparison (while evaluate_join_record uses longlong),
resulting in pruning failures when comparing DATE to DATETIME.

Fix was to always comparing DATE vs DATETIME as DATETIME,
by adding ' 00:00:00' to the DATE string.

And adding optimization for comparing with 23:59:59, so that
DATETIME_col > '2001-02-03 23:59:59' ->
TO_DAYS(DATETIME_col) > TO_DAYS('2001-02-03 23:59:59') instead
of '>='.

mysql-test/r/partition_pruning.result:
  Bug#46362: Endpoint should be set to false for TO_DAYS(DATE)
  
  Updated result-file
mysql-test/t/partition_pruning.test:
  Bug#46362: Endpoint should be set to false for TO_DAYS(DATE)
  
  Added testcases.
sql-common/my_time.c:
  Bug#46362: Endpoint should be set to false for TO_DAYS(DATE)
  
  removed duplicate assignment.
sql/item.cc:
  Bug#46362: Endpoint should be set to false for TO_DAYS(DATE)
  
  Changed field_is_equal_to_item into field_cmp_to_item, to
  better handling DATE vs DATETIME comparision.
sql/item.h:
  Bug#46362: Endpoint should be set to false for TO_DAYS(DATE)
  
  Updated comment
sql/item_timefunc.cc:
  Bug#46362: Endpoint should be set to false for TO_DAYS(DATE)
  
  Added optimization (pruning) of DATETIME where time-part is
  23:59:59
sql/opt_range.cc:
  Bug#46362: Endpoint should be set to false for TO_DAYS(DATE)
  
  Using the new stored_field_cmp_to_item for better pruning.

1 files changed, 621 insertions, 0 deletions

diff --git a/mysql-test/r/partition_pruning.result b/mysql-test/r/partition_pruning.result
index 26ddc92e97b..abaa37715bf 100644
--- a/mysql-test/r/partition_pruning.result
+++ b/mysql-test/r/partition_pruning.result
@@ -1,4 +1,625 @@
 drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
+# Test with DATETIME column NOT NULL
+CREATE TABLE t1 (
+a int(10) unsigned NOT NULL,
+b DATETIME NOT NULL,
+PRIMARY KEY (a, b)
+) PARTITION BY RANGE (TO_DAYS(b))
+(PARTITION p20090401 VALUES LESS THAN (TO_DAYS('2009-04-02')),
+PARTITION p20090402 VALUES LESS THAN (TO_DAYS('2009-04-03')),
+PARTITION p20090403 VALUES LESS THAN (TO_DAYS('2009-04-04')),
+PARTITION p20090404 VALUES LESS THAN (TO_DAYS('2009-04-05')),
+PARTITION p20090405 VALUES LESS THAN MAXVALUE);
+INSERT INTO t1 VALUES (1, '2009-01-01'), (1, '2009-04-01'), (2, '2009-04-01'),
+(1, '2009-04-02'), (2, '2009-04-02'), (1, '2009-04-02 23:59:59'),
+(1, '2009-04-03'), (2, '2009-04-03'), (1, '2009-04-04'), (2, '2009-04-04'),
+(1, '2009-04-05'), (1, '2009-04-06'), (1, '2009-04-07');
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < CAST('2009-04-03' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	12	NULL	6	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= CAST('2009-04-03' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402,p20090403	index	NULL	PRIMARY	12	NULL	8	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = CAST('2009-04-03' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403	index	NULL	PRIMARY	12	NULL	8	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= CAST('2009-04-03' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403,p20090404,p20090405	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > CAST('2009-04-03' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403,p20090404,p20090405	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b < CAST('2009-04-02 23:59:59' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b <= CAST('2009-04-02 23:59:59' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b = CAST('2009-04-02 23:59:59' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090402	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b >= CAST('2009-04-02 23:59:59' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090402,p20090403,p20090404,p20090405	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b > CAST('2009-04-02 23:59:59' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403,p20090404,p20090405	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < CAST('2009-04-03' AS DATE);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= CAST('2009-04-03' AS DATE);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402,p20090403	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = CAST('2009-04-03' AS DATE);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= CAST('2009-04-03' AS DATE);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403,p20090404,p20090405	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > CAST('2009-04-03' AS DATE);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403,p20090404,p20090405	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < '2009-04-03 00:00:00';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= '2009-04-03 00:00:00';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402,p20090403	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = '2009-04-03 00:00:00';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= '2009-04-03 00:00:00';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403,p20090404,p20090405	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > '2009-04-03 00:00:00';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403,p20090404,p20090405	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < '2009-04-02 23:59:59';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= '2009-04-02 23:59:59';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = '2009-04-02 23:59:59';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090402	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= '2009-04-02 23:59:59';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090402,p20090403,p20090404,p20090405	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > '2009-04-02 23:59:59';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403,p20090404,p20090405	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < '2009-04-03';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= '2009-04-03';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402,p20090403	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = '2009-04-03';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= '2009-04-03';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403,p20090404,p20090405	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > '2009-04-03';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403,p20090404,p20090405	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b < CAST('2009-04-03 00:00:01' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402,p20090403	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b <= CAST('2009-04-03 00:00:01' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402,p20090403	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b = CAST('2009-04-03 00:00:01' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b >= CAST('2009-04-03 00:00:01' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403,p20090404,p20090405	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b > CAST('2009-04-03 00:00:01' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403,p20090404,p20090405	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b < CAST('2009-04-02 23:59:58' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b <= CAST('2009-04-02 23:59:58' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b = CAST('2009-04-02 23:59:58' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090402	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b >= CAST('2009-04-02 23:59:58' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090402,p20090403,p20090404,p20090405	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b > CAST('2009-04-02 23:59:58' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090402,p20090403,p20090404,p20090405	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+DROP TABLE t1;
+# Test with DATE column NOT NULL
+CREATE TABLE t1 (
+a int(10) unsigned NOT NULL,
+b DATE NOT NULL,
+PRIMARY KEY (a, b)
+) PARTITION BY RANGE (TO_DAYS(b))
+(PARTITION p20090401 VALUES LESS THAN (TO_DAYS('2009-04-02')),
+PARTITION p20090402 VALUES LESS THAN (TO_DAYS('2009-04-03')),
+PARTITION p20090403 VALUES LESS THAN (TO_DAYS('2009-04-04')),
+PARTITION p20090404 VALUES LESS THAN (TO_DAYS('2009-04-05')),
+PARTITION p20090405 VALUES LESS THAN MAXVALUE);
+INSERT INTO t1 VALUES (1, '2009-01-01'), (1, '2009-04-01'), (2, '2009-04-01'),
+(1, '2009-04-02'), (2, '2009-04-02'), (1, '2009-04-03'), (2, '2009-04-03'),
+(1, '2009-04-04'), (2, '2009-04-04'), (1, '2009-04-05'), (1, '2009-04-06'),
+(1, '2009-04-07');
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < CAST('2009-04-03' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	7	NULL	5	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= CAST('2009-04-03' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402,p20090403	index	NULL	PRIMARY	7	NULL	7	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = CAST('2009-04-03' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403	index	NULL	PRIMARY	7	NULL	7	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= CAST('2009-04-03' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403,p20090404,p20090405	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > CAST('2009-04-03' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090404,p20090405	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b < CAST('2009-04-02 23:59:59' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b <= CAST('2009-04-02 23:59:59' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b = CAST('2009-04-02 23:59:59' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b >= CAST('2009-04-02 23:59:59' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403,p20090404,p20090405	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b > CAST('2009-04-02 23:59:59' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403,p20090404,p20090405	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < CAST('2009-04-03' AS DATE);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= CAST('2009-04-03' AS DATE);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402,p20090403	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = CAST('2009-04-03' AS DATE);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= CAST('2009-04-03' AS DATE);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403,p20090404,p20090405	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > CAST('2009-04-03' AS DATE);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090404,p20090405	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < '2009-04-03 00:00:00';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= '2009-04-03 00:00:00';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402,p20090403	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = '2009-04-03 00:00:00';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= '2009-04-03 00:00:00';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403,p20090404,p20090405	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > '2009-04-03 00:00:00';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090404,p20090405	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < '2009-04-02 23:59:59';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= '2009-04-02 23:59:59';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = '2009-04-02 23:59:59';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= '2009-04-02 23:59:59';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403,p20090404,p20090405	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > '2009-04-02 23:59:59';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403,p20090404,p20090405	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < '2009-04-03';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= '2009-04-03';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402,p20090403	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = '2009-04-03';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= '2009-04-03';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403,p20090404,p20090405	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > '2009-04-03';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090404,p20090405	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b < CAST('2009-04-03 00:00:01' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402,p20090403	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b <= CAST('2009-04-03 00:00:01' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402,p20090403	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b = CAST('2009-04-03 00:00:01' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b >= CAST('2009-04-03 00:00:01' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090404,p20090405	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b > CAST('2009-04-03 00:00:01' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090404,p20090405	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b < CAST('2009-04-02 23:59:58' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b <= CAST('2009-04-02 23:59:58' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b = CAST('2009-04-02 23:59:58' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b >= CAST('2009-04-02 23:59:58' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403,p20090404,p20090405	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b > CAST('2009-04-02 23:59:58' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403,p20090404,p20090405	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+DROP TABLE t1;
+# Test with DATETIME column NULL
+CREATE TABLE t1 (
+a int(10) unsigned NOT NULL,
+b DATETIME NULL
+) PARTITION BY RANGE (TO_DAYS(b))
+(PARTITION p20090401 VALUES LESS THAN (TO_DAYS('2009-04-02')),
+PARTITION p20090402 VALUES LESS THAN (TO_DAYS('2009-04-03')),
+PARTITION p20090403 VALUES LESS THAN (TO_DAYS('2009-04-04')),
+PARTITION p20090404 VALUES LESS THAN (TO_DAYS('2009-04-05')),
+PARTITION p20090405 VALUES LESS THAN MAXVALUE);
+INSERT INTO t1 VALUES (1, '2009-01-01'), (1, '2009-04-01'), (2, '2009-04-01'),
+(1, '2009-04-02'), (2, '2009-04-02'), (1, '2009-04-02 23:59:59'),
+(1, '2009-04-03'), (2, '2009-04-03'), (1, '2009-04-04'), (2, '2009-04-04'),
+(1, '2009-04-05'), (1, '2009-04-06'), (1, '2009-04-07');
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < CAST('2009-04-03' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	6	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= CAST('2009-04-03' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402,p20090403	ALL	NULL	NULL	NULL	NULL	8	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = CAST('2009-04-03' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403	ALL	NULL	NULL	NULL	NULL	8	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= CAST('2009-04-03' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	13	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > CAST('2009-04-03' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	13	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b < CAST('2009-04-02 23:59:59' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	13	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b <= CAST('2009-04-02 23:59:59' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	13	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b = CAST('2009-04-02 23:59:59' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090402	ALL	NULL	NULL	NULL	NULL	13	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b >= CAST('2009-04-02 23:59:59' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090402,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	13	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b > CAST('2009-04-02 23:59:59' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	13	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < CAST('2009-04-03' AS DATE);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	13	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= CAST('2009-04-03' AS DATE);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402,p20090403	ALL	NULL	NULL	NULL	NULL	13	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = CAST('2009-04-03' AS DATE);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403	ALL	NULL	NULL	NULL	NULL	13	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= CAST('2009-04-03' AS DATE);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	13	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > CAST('2009-04-03' AS DATE);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	13	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < '2009-04-03 00:00:00';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	13	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= '2009-04-03 00:00:00';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402,p20090403	ALL	NULL	NULL	NULL	NULL	13	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = '2009-04-03 00:00:00';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403	ALL	NULL	NULL	NULL	NULL	13	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= '2009-04-03 00:00:00';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	13	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > '2009-04-03 00:00:00';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	13	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < '2009-04-02 23:59:59';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	13	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= '2009-04-02 23:59:59';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	13	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = '2009-04-02 23:59:59';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090402	ALL	NULL	NULL	NULL	NULL	13	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= '2009-04-02 23:59:59';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090402,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	13	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > '2009-04-02 23:59:59';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	13	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < '2009-04-03';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	13	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= '2009-04-03';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402,p20090403	ALL	NULL	NULL	NULL	NULL	13	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = '2009-04-03';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403	ALL	NULL	NULL	NULL	NULL	13	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= '2009-04-03';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	13	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > '2009-04-03';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	13	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b < CAST('2009-04-03 00:00:01' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402,p20090403	ALL	NULL	NULL	NULL	NULL	13	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b <= CAST('2009-04-03 00:00:01' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402,p20090403	ALL	NULL	NULL	NULL	NULL	13	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b = CAST('2009-04-03 00:00:01' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403	ALL	NULL	NULL	NULL	NULL	13	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b >= CAST('2009-04-03 00:00:01' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	13	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b > CAST('2009-04-03 00:00:01' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	13	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b < CAST('2009-04-02 23:59:58' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	13	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b <= CAST('2009-04-02 23:59:58' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	13	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b = CAST('2009-04-02 23:59:58' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090402	ALL	NULL	NULL	NULL	NULL	13	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b >= CAST('2009-04-02 23:59:58' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090402,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	13	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b > CAST('2009-04-02 23:59:58' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090402,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	13	Using where
+DROP TABLE t1;
+# Test with DATE column NULL
+CREATE TABLE t1 (
+a int(10) unsigned NOT NULL,
+b DATE NULL
+) PARTITION BY RANGE (TO_DAYS(b))
+(PARTITION p20090401 VALUES LESS THAN (TO_DAYS('2009-04-02')),
+PARTITION p20090402 VALUES LESS THAN (TO_DAYS('2009-04-03')),
+PARTITION p20090403 VALUES LESS THAN (TO_DAYS('2009-04-04')),
+PARTITION p20090404 VALUES LESS THAN (TO_DAYS('2009-04-05')),
+PARTITION p20090405 VALUES LESS THAN MAXVALUE);
+INSERT INTO t1 VALUES (1, '2009-01-01'), (1, '2009-04-01'), (2, '2009-04-01'),
+(1, '2009-04-02'), (2, '2009-04-02'), (1, '2009-04-03'), (2, '2009-04-03'),
+(1, '2009-04-04'), (2, '2009-04-04'), (1, '2009-04-05'), (1, '2009-04-06'),
+(1, '2009-04-07');
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < CAST('2009-04-03' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	5	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= CAST('2009-04-03' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402,p20090403	ALL	NULL	NULL	NULL	NULL	7	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = CAST('2009-04-03' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403	ALL	NULL	NULL	NULL	NULL	7	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= CAST('2009-04-03' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	12	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > CAST('2009-04-03' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	12	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b < CAST('2009-04-02 23:59:59' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	12	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b <= CAST('2009-04-02 23:59:59' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	12	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b = CAST('2009-04-02 23:59:59' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b >= CAST('2009-04-02 23:59:59' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	12	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b > CAST('2009-04-02 23:59:59' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	12	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < CAST('2009-04-03' AS DATE);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	12	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= CAST('2009-04-03' AS DATE);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402,p20090403	ALL	NULL	NULL	NULL	NULL	12	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = CAST('2009-04-03' AS DATE);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403	ALL	NULL	NULL	NULL	NULL	12	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= CAST('2009-04-03' AS DATE);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	12	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > CAST('2009-04-03' AS DATE);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	12	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < '2009-04-03 00:00:00';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	12	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= '2009-04-03 00:00:00';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402,p20090403	ALL	NULL	NULL	NULL	NULL	12	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = '2009-04-03 00:00:00';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403	ALL	NULL	NULL	NULL	NULL	12	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= '2009-04-03 00:00:00';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	12	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > '2009-04-03 00:00:00';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	12	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < '2009-04-02 23:59:59';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	12	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= '2009-04-02 23:59:59';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	12	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = '2009-04-02 23:59:59';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= '2009-04-02 23:59:59';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	12	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > '2009-04-02 23:59:59';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	12	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < '2009-04-03';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	12	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= '2009-04-03';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402,p20090403	ALL	NULL	NULL	NULL	NULL	12	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = '2009-04-03';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403	ALL	NULL	NULL	NULL	NULL	12	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= '2009-04-03';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	12	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > '2009-04-03';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	12	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b < CAST('2009-04-03 00:00:01' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402,p20090403	ALL	NULL	NULL	NULL	NULL	12	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b <= CAST('2009-04-03 00:00:01' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402,p20090403	ALL	NULL	NULL	NULL	NULL	12	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b = CAST('2009-04-03 00:00:01' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b >= CAST('2009-04-03 00:00:01' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	12	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b > CAST('2009-04-03 00:00:01' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	12	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b < CAST('2009-04-02 23:59:58' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	12	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b <= CAST('2009-04-02 23:59:58' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	12	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b = CAST('2009-04-02 23:59:58' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b >= CAST('2009-04-02 23:59:58' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	12	Using where
+EXPLAIN PARTITIONS SELECT * FROM t1
+WHERE b > CAST('2009-04-02 23:59:58' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	12	Using where
+DROP TABLE t1;
+# For better code coverage of the patch
+CREATE TABLE t1 (
+a int(10) unsigned NOT NULL,
+b DATE
+) PARTITION BY RANGE ( TO_DAYS(b) )
+(PARTITION p20090401 VALUES LESS THAN (TO_DAYS('2009-04-02')),
+PARTITION p20090402 VALUES LESS THAN (TO_DAYS('2009-04-03')),
+PARTITION p20090403 VALUES LESS THAN (TO_DAYS('2009-04-04')),
+PARTITION p20090404 VALUES LESS THAN (TO_DAYS('2009-04-05')),
+PARTITION p20090405 VALUES LESS THAN MAXVALUE);
+INSERT INTO t1 VALUES (1, '2009-01-01'), (2, NULL);
+# test with an invalid date, which lead to item->null_value is set.
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < CAST('2009-04-99' AS DATETIME);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
+Warnings:
+Warning	1292	Incorrect datetime value: '2009-04-99'
+Warning	1292	Incorrect datetime value: '2009-04-99'
+DROP TABLE t1;
 CREATE TABLE t1
 (a INT NOT NULL AUTO_INCREMENT,
 b DATETIME,