diff --git a/mysql-test/suite/tianmu/r/issue829.result b/mysql-test/suite/tianmu/r/issue829.result
new file mode 100644
index 000000000..39f99b075
--- /dev/null
+++ b/mysql-test/suite/tianmu/r/issue829.result
@@ -0,0 +1,74 @@
+CREATE TABLE t1
+(
+t1_tinyint TINYINT DEFAULT 0,
+t1_int INT DEFAULT NULL,
+t1_bigint BIGINT,
+t1_decimal DECIMAL(5,2),
+t1_text TEXT,
+t1_char CHAR(5),
+t1_varchar VARCHAR(255) DEFAULT 'hello world!',
+t1_datetime DATETIME
+)ENGINE=tianmu;
+INSERT INTO t1 VALUES();
+INSERT INTO t1 VALUES(NULL, NULL, NULL, NULL, '', '', '', NULL);
+INSERT INTO t1 VALUES(1, 123456, 987654321, 122.32, repeat('z', 20), 'aaa', repeat('a', 20), '1111-11-11 11:11:11');
+INSERT INTO t1 VALUES(0, 1023456, 887654321, 222.32, repeat('y', 20), 'aaa', repeat('b', 20), '1111-11-11 11:11:11');
+INSERT INTO t1 VALUES(1, -123456, -987654321, -122.32, repeat('z', 20), 'bbb', repeat('a', 20), '1111-11-11 11:11:11');
+INSERT INTO t1 VALUES(0, -1023456, -887654321, -222.32, repeat('x', 20), 'bbb', repeat('b', 20), '1111-11-11 11:11:11');
+SELECT * FROM t1 WHERE t1_datetime IN ('1111-11-11 11:11:11','1111-11-13 0:0:0');
+t1_tinyint	t1_int	t1_bigint	t1_decimal	t1_text	t1_char	t1_varchar	t1_datetime
+1	123456	987654321	122.32	zzzzzzzzzzzzzzzzzzzz	aaa	aaaaaaaaaaaaaaaaaaaa	1111-11-11 11:11:11
+0	1023456	887654321	222.32	yyyyyyyyyyyyyyyyyyyy	aaa	bbbbbbbbbbbbbbbbbbbb	1111-11-11 11:11:11
+1	-123456	-987654321	-122.32	zzzzzzzzzzzzzzzzzzzz	bbb	aaaaaaaaaaaaaaaaaaaa	1111-11-11 11:11:11
+0	-1023456	-887654321	-222.32	xxxxxxxxxxxxxxxxxxxx	bbb	bbbbbbbbbbbbbbbbbbbb	1111-11-11 11:11:11
+SELECT * FROM t1 WHERE t1_datetime = '1111-11-13 0:0:0';
+t1_tinyint	t1_int	t1_bigint	t1_decimal	t1_text	t1_char	t1_varchar	t1_datetime
+SELECT * FROM t1 WHERE t1_datetime = '1111-11-11 11:11:11';
+t1_tinyint	t1_int	t1_bigint	t1_decimal	t1_text	t1_char	t1_varchar	t1_datetime
+1	123456	987654321	122.32	zzzzzzzzzzzzzzzzzzzz	aaa	aaaaaaaaaaaaaaaaaaaa	1111-11-11 11:11:11
+0	1023456	887654321	222.32	yyyyyyyyyyyyyyyyyyyy	aaa	bbbbbbbbbbbbbbbbbbbb	1111-11-11 11:11:11
+1	-123456	-987654321	-122.32	zzzzzzzzzzzzzzzzzzzz	bbb	aaaaaaaaaaaaaaaaaaaa	1111-11-11 11:11:11
+0	-1023456	-887654321	-222.32	xxxxxxxxxxxxxxxxxxxx	bbb	bbbbbbbbbbbbbbbbbbbb	1111-11-11 11:11:11
+SELECT * FROM t1 WHERE t1_datetime < '1111-11-13 0:0:0';
+t1_tinyint	t1_int	t1_bigint	t1_decimal	t1_text	t1_char	t1_varchar	t1_datetime
+1	123456	987654321	122.32	zzzzzzzzzzzzzzzzzzzz	aaa	aaaaaaaaaaaaaaaaaaaa	1111-11-11 11:11:11
+0	1023456	887654321	222.32	yyyyyyyyyyyyyyyyyyyy	aaa	bbbbbbbbbbbbbbbbbbbb	1111-11-11 11:11:11
+1	-123456	-987654321	-122.32	zzzzzzzzzzzzzzzzzzzz	bbb	aaaaaaaaaaaaaaaaaaaa	1111-11-11 11:11:11
+0	-1023456	-887654321	-222.32	xxxxxxxxxxxxxxxxxxxx	bbb	bbbbbbbbbbbbbbbbbbbb	1111-11-11 11:11:11
+SELECT * FROM t1 WHERE t1_datetime > '1111-11-13 0:0:0';
+t1_tinyint	t1_int	t1_bigint	t1_decimal	t1_text	t1_char	t1_varchar	t1_datetime
+SELECT * FROM t1 WHERE t1_datetime > '1111-11-10 0:0:0';
+t1_tinyint	t1_int	t1_bigint	t1_decimal	t1_text	t1_char	t1_varchar	t1_datetime
+1	123456	987654321	122.32	zzzzzzzzzzzzzzzzzzzz	aaa	aaaaaaaaaaaaaaaaaaaa	1111-11-11 11:11:11
+0	1023456	887654321	222.32	yyyyyyyyyyyyyyyyyyyy	aaa	bbbbbbbbbbbbbbbbbbbb	1111-11-11 11:11:11
+1	-123456	-987654321	-122.32	zzzzzzzzzzzzzzzzzzzz	bbb	aaaaaaaaaaaaaaaaaaaa	1111-11-11 11:11:11
+0	-1023456	-887654321	-222.32	xxxxxxxxxxxxxxxxxxxx	bbb	bbbbbbbbbbbbbbbbbbbb	1111-11-11 11:11:11
+CREATE TABLE t2
+(
+t1_tinyint TINYINT DEFAULT 0,
+t1_int INT DEFAULT NULL,
+t1_bigint BIGINT,
+t1_decimal DECIMAL(5,2),
+t1_text TEXT,
+t1_char CHAR(5),
+t1_varchar VARCHAR(255) DEFAULT 'hello world!',
+t1_datetime DATETIME
+)ENGINE=tianmu;
+INSERT INTO t2 VALUES();
+INSERT INTO t2 VALUES(NULL, NULL, NULL, NULL, '', '', '', NULL);
+INSERT INTO t2 VALUES(1, 123456, 987654321, 122.32, repeat('z', 20), 'aaa', repeat('a', 20), '1111-11-11 22:22:22');
+INSERT INTO t2 VALUES(0, 1023456, 887654321, 222.32, repeat('y', 20), 'aaa', repeat('b', 20), '1111-11-12 11:11:11');
+INSERT INTO t2 VALUES(1, -123456, -987654321, -122.32, repeat('z', 20), 'bbb', repeat('a', 20), '1111-11-13 11:11:11');
+INSERT INTO t2 VALUES(0, -1023456, -887654321, -222.32, repeat('x', 20), 'bbb', repeat('b', 20), '1111-11-14 11:11:11');
+SELECT * FROM t2 WHERE t1_datetime IN ('1111-11-11 0:0:0','1111-11-13 11:11:11');
+t1_tinyint	t1_int	t1_bigint	t1_decimal	t1_text	t1_char	t1_varchar	t1_datetime
+1	-123456	-987654321	-122.32	zzzzzzzzzzzzzzzzzzzz	bbb	aaaaaaaaaaaaaaaaaaaa	1111-11-13 11:11:11
+SELECT * FROM t1,t2 WHERE 
+t1.t1_datetime IN ('1111-11-11 11:11:11','1111-11-13 0:0:0') and
+t2.t1_datetime IN ('1111-11-11 0:0:0','1111-11-13 11:11:11');
+t1_tinyint	t1_int	t1_bigint	t1_decimal	t1_text	t1_char	t1_varchar	t1_datetime	t1_tinyint	t1_int	t1_bigint	t1_decimal	t1_text	t1_char	t1_varchar	t1_datetime
+1	123456	987654321	122.32	zzzzzzzzzzzzzzzzzzzz	aaa	aaaaaaaaaaaaaaaaaaaa	1111-11-11 11:11:11	1	-123456	-987654321	-122.32	zzzzzzzzzzzzzzzzzzzz	bbb	aaaaaaaaaaaaaaaaaaaa	1111-11-13 11:11:11
+0	1023456	887654321	222.32	yyyyyyyyyyyyyyyyyyyy	aaa	bbbbbbbbbbbbbbbbbbbb	1111-11-11 11:11:11	1	-123456	-987654321	-122.32	zzzzzzzzzzzzzzzzzzzz	bbb	aaaaaaaaaaaaaaaaaaaa	1111-11-13 11:11:11
+1	-123456	-987654321	-122.32	zzzzzzzzzzzzzzzzzzzz	bbb	aaaaaaaaaaaaaaaaaaaa	1111-11-11 11:11:11	1	-123456	-987654321	-122.32	zzzzzzzzzzzzzzzzzzzz	bbb	aaaaaaaaaaaaaaaaaaaa	1111-11-13 11:11:11
+0	-1023456	-887654321	-222.32	xxxxxxxxxxxxxxxxxxxx	bbb	bbbbbbbbbbbbbbbbbbbb	1111-11-11 11:11:11	1	-123456	-987654321	-122.32	zzzzzzzzzzzzzzzzzzzz	bbb	aaaaaaaaaaaaaaaaaaaa	1111-11-13 11:11:11
+drop table t1 ,t2;
diff --git a/mysql-test/suite/tianmu/t/issue829.test b/mysql-test/suite/tianmu/t/issue829.test
new file mode 100644
index 000000000..8626b724d
--- /dev/null
+++ b/mysql-test/suite/tianmu/t/issue829.test
@@ -0,0 +1,61 @@
+--source include/have_tianmu.inc
+
+CREATE TABLE t1
+(
+ t1_tinyint TINYINT DEFAULT 0,
+ t1_int INT DEFAULT NULL,
+ t1_bigint BIGINT,
+ t1_decimal DECIMAL(5,2),
+ t1_text TEXT,
+ t1_char CHAR(5),
+ t1_varchar VARCHAR(255) DEFAULT 'hello world!',
+ t1_datetime DATETIME
+)ENGINE=tianmu;
+
+INSERT INTO t1 VALUES();
+INSERT INTO t1 VALUES(NULL, NULL, NULL, NULL, '', '', '', NULL);
+INSERT INTO t1 VALUES(1, 123456, 987654321, 122.32, repeat('z', 20), 'aaa', repeat('a', 20), '1111-11-11 11:11:11');
+INSERT INTO t1 VALUES(0, 1023456, 887654321, 222.32, repeat('y', 20), 'aaa', repeat('b', 20), '1111-11-11 11:11:11');
+INSERT INTO t1 VALUES(1, -123456, -987654321, -122.32, repeat('z', 20), 'bbb', repeat('a', 20), '1111-11-11 11:11:11');
+INSERT INTO t1 VALUES(0, -1023456, -887654321, -222.32, repeat('x', 20), 'bbb', repeat('b', 20), '1111-11-11 11:11:11');
+
+SELECT * FROM t1 WHERE t1_datetime IN ('1111-11-11 11:11:11','1111-11-13 0:0:0');
+
+SELECT * FROM t1 WHERE t1_datetime = '1111-11-13 0:0:0';
+
+SELECT * FROM t1 WHERE t1_datetime = '1111-11-11 11:11:11';
+
+SELECT * FROM t1 WHERE t1_datetime < '1111-11-13 0:0:0';
+
+SELECT * FROM t1 WHERE t1_datetime > '1111-11-13 0:0:0';
+
+SELECT * FROM t1 WHERE t1_datetime > '1111-11-10 0:0:0';
+
+
+CREATE TABLE t2
+(
+ t1_tinyint TINYINT DEFAULT 0,
+ t1_int INT DEFAULT NULL,
+ t1_bigint BIGINT,
+ t1_decimal DECIMAL(5,2),
+ t1_text TEXT,
+ t1_char CHAR(5),
+ t1_varchar VARCHAR(255) DEFAULT 'hello world!',
+ t1_datetime DATETIME
+)ENGINE=tianmu;
+
+INSERT INTO t2 VALUES();
+INSERT INTO t2 VALUES(NULL, NULL, NULL, NULL, '', '', '', NULL);
+INSERT INTO t2 VALUES(1, 123456, 987654321, 122.32, repeat('z', 20), 'aaa', repeat('a', 20), '1111-11-11 22:22:22');
+INSERT INTO t2 VALUES(0, 1023456, 887654321, 222.32, repeat('y', 20), 'aaa', repeat('b', 20), '1111-11-12 11:11:11');
+INSERT INTO t2 VALUES(1, -123456, -987654321, -122.32, repeat('z', 20), 'bbb', repeat('a', 20), '1111-11-13 11:11:11');
+INSERT INTO t2 VALUES(0, -1023456, -887654321, -222.32, repeat('x', 20), 'bbb', repeat('b', 20), '1111-11-14 11:11:11');
+
+SELECT * FROM t2 WHERE t1_datetime IN ('1111-11-11 0:0:0','1111-11-13 11:11:11');
+
+SELECT * FROM t1,t2 WHERE 
+  t1.t1_datetime IN ('1111-11-11 11:11:11','1111-11-13 0:0:0') and
+  t2.t1_datetime IN ('1111-11-11 0:0:0','1111-11-13 11:11:11');
+
+
+drop table t1 ,t2;
\ No newline at end of file
diff --git a/storage/tianmu/types/rc_datetime.cpp b/storage/tianmu/types/rc_datetime.cpp
index 8e4de8471..98233fa83 100644
--- a/storage/tianmu/types/rc_datetime.cpp
+++ b/storage/tianmu/types/rc_datetime.cpp
@@ -82,11 +82,10 @@ RCDateTime::RCDateTime(short year, short month, short day, short hour, short min
   dt_.second = std::abs(second);
 }
 
-RCDateTime::RCDateTime(const MYSQL_TIME &myt, common::CT at) {
+RCDateTime::RCDateTime(const MYSQL_TIME &myt, common::CT at) : at_(at) {
   ASSERT(at == common::CT::DATETIME || at == common::CT::TIMESTAMP || at == common::CT::DATE,
          "should be 'at == common::CT::DATETIME || at == common::CT::TIMESTAMP || common::CT::DATE'");
   null_ = false;
-
   dt_.year = myt.year;
   dt_.month = myt.month;
   dt_.day = myt.day;