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, 308 insertions, 0 deletions

diff --git a/mysql-test/t/partition_pruning.test b/mysql-test/t/partition_pruning.test
index ad102062ef8..ef28820852e 100644
--- a/mysql-test/t/partition_pruning.test
+++ b/mysql-test/t/partition_pruning.test
@@ -9,6 +9,314 @@ drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
 --enable_warnings
 
 #
+# Bug#46362: Endpoint should be set to false for TO_DAYS(DATE)
+#
+# There is a problem when comparing DATE with DATETIME.
+# In pruning it is converted into the field type
+# and in row evaluation it is converted to longlong
+# (like a DATETIME).
+--echo # 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);
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= CAST('2009-04-03' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = CAST('2009-04-03' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= CAST('2009-04-03' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > CAST('2009-04-03' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b < CAST('2009-04-02 23:59:59' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b <= CAST('2009-04-02 23:59:59' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b = CAST('2009-04-02 23:59:59' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b >= CAST('2009-04-02 23:59:59' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b > CAST('2009-04-02 23:59:59' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < CAST('2009-04-03' AS DATE);
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= CAST('2009-04-03' AS DATE);
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = CAST('2009-04-03' AS DATE);
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= CAST('2009-04-03' AS DATE);
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > CAST('2009-04-03' AS DATE);
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < '2009-04-03 00:00:00';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= '2009-04-03 00:00:00';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = '2009-04-03 00:00:00';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= '2009-04-03 00:00:00';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > '2009-04-03 00:00:00';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < '2009-04-02 23:59:59';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= '2009-04-02 23:59:59';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = '2009-04-02 23:59:59';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= '2009-04-02 23:59:59';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > '2009-04-02 23:59:59';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < '2009-04-03';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= '2009-04-03';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = '2009-04-03';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= '2009-04-03';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > '2009-04-03';
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b < CAST('2009-04-03 00:00:01' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b <= CAST('2009-04-03 00:00:01' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b = CAST('2009-04-03 00:00:01' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b >= CAST('2009-04-03 00:00:01' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b > CAST('2009-04-03 00:00:01' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b < CAST('2009-04-02 23:59:58' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b <= CAST('2009-04-02 23:59:58' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b = CAST('2009-04-02 23:59:58' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b >= CAST('2009-04-02 23:59:58' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b > CAST('2009-04-02 23:59:58' AS DATETIME);
+DROP TABLE t1;
+
+--echo # 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);
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= CAST('2009-04-03' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = CAST('2009-04-03' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= CAST('2009-04-03' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > CAST('2009-04-03' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b < CAST('2009-04-02 23:59:59' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b <= CAST('2009-04-02 23:59:59' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b = CAST('2009-04-02 23:59:59' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b >= CAST('2009-04-02 23:59:59' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b > CAST('2009-04-02 23:59:59' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < CAST('2009-04-03' AS DATE);
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= CAST('2009-04-03' AS DATE);
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = CAST('2009-04-03' AS DATE);
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= CAST('2009-04-03' AS DATE);
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > CAST('2009-04-03' AS DATE);
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < '2009-04-03 00:00:00';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= '2009-04-03 00:00:00';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = '2009-04-03 00:00:00';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= '2009-04-03 00:00:00';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > '2009-04-03 00:00:00';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < '2009-04-02 23:59:59';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= '2009-04-02 23:59:59';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = '2009-04-02 23:59:59';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= '2009-04-02 23:59:59';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > '2009-04-02 23:59:59';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < '2009-04-03';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= '2009-04-03';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = '2009-04-03';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= '2009-04-03';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > '2009-04-03';
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b < CAST('2009-04-03 00:00:01' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b <= CAST('2009-04-03 00:00:01' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b = CAST('2009-04-03 00:00:01' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b >= CAST('2009-04-03 00:00:01' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b > CAST('2009-04-03 00:00:01' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b < CAST('2009-04-02 23:59:58' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b <= CAST('2009-04-02 23:59:58' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b = CAST('2009-04-02 23:59:58' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b >= CAST('2009-04-02 23:59:58' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b > CAST('2009-04-02 23:59:58' AS DATETIME);
+DROP TABLE t1;
+
+--echo # 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);
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= CAST('2009-04-03' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = CAST('2009-04-03' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= CAST('2009-04-03' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > CAST('2009-04-03' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b < CAST('2009-04-02 23:59:59' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b <= CAST('2009-04-02 23:59:59' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b = CAST('2009-04-02 23:59:59' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b >= CAST('2009-04-02 23:59:59' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b > CAST('2009-04-02 23:59:59' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < CAST('2009-04-03' AS DATE);
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= CAST('2009-04-03' AS DATE);
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = CAST('2009-04-03' AS DATE);
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= CAST('2009-04-03' AS DATE);
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > CAST('2009-04-03' AS DATE);
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < '2009-04-03 00:00:00';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= '2009-04-03 00:00:00';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = '2009-04-03 00:00:00';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= '2009-04-03 00:00:00';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > '2009-04-03 00:00:00';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < '2009-04-02 23:59:59';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= '2009-04-02 23:59:59';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = '2009-04-02 23:59:59';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= '2009-04-02 23:59:59';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > '2009-04-02 23:59:59';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < '2009-04-03';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= '2009-04-03';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = '2009-04-03';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= '2009-04-03';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > '2009-04-03';
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b < CAST('2009-04-03 00:00:01' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b <= CAST('2009-04-03 00:00:01' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b = CAST('2009-04-03 00:00:01' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b >= CAST('2009-04-03 00:00:01' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b > CAST('2009-04-03 00:00:01' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b < CAST('2009-04-02 23:59:58' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b <= CAST('2009-04-02 23:59:58' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b = CAST('2009-04-02 23:59:58' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b >= CAST('2009-04-02 23:59:58' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b > CAST('2009-04-02 23:59:58' AS DATETIME);
+DROP TABLE t1;
+
+--echo # 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);
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= CAST('2009-04-03' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = CAST('2009-04-03' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= CAST('2009-04-03' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > CAST('2009-04-03' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b < CAST('2009-04-02 23:59:59' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b <= CAST('2009-04-02 23:59:59' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b = CAST('2009-04-02 23:59:59' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b >= CAST('2009-04-02 23:59:59' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b > CAST('2009-04-02 23:59:59' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < CAST('2009-04-03' AS DATE);
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= CAST('2009-04-03' AS DATE);
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = CAST('2009-04-03' AS DATE);
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= CAST('2009-04-03' AS DATE);
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > CAST('2009-04-03' AS DATE);
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < '2009-04-03 00:00:00';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= '2009-04-03 00:00:00';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = '2009-04-03 00:00:00';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= '2009-04-03 00:00:00';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > '2009-04-03 00:00:00';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < '2009-04-02 23:59:59';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= '2009-04-02 23:59:59';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = '2009-04-02 23:59:59';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= '2009-04-02 23:59:59';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > '2009-04-02 23:59:59';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < '2009-04-03';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= '2009-04-03';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = '2009-04-03';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= '2009-04-03';
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > '2009-04-03';
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b < CAST('2009-04-03 00:00:01' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b <= CAST('2009-04-03 00:00:01' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b = CAST('2009-04-03 00:00:01' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b >= CAST('2009-04-03 00:00:01' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b > CAST('2009-04-03 00:00:01' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b < CAST('2009-04-02 23:59:58' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b <= CAST('2009-04-02 23:59:58' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b = CAST('2009-04-02 23:59:58' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b >= CAST('2009-04-02 23:59:58' AS DATETIME);
+EXPLAIN PARTITIONS SELECT * FROM t1
+  WHERE b > CAST('2009-04-02 23:59:58' AS DATETIME);
+DROP TABLE t1;
+
+--echo # 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);
+--echo # 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);
+DROP TABLE t1;
+
+#
 # Bug#40972: some sql execution lead the whole database crashing
 #
 # Setup so the start is at partition pX and end is at p1