Bug #21103: DATE column not compared as DATE

If we compare two items A and B, with B being (a constant) of a
larger type, then A gets promoted to B's type for comparison if
it's a constant, function, or CAST() column, but B gets demoted
to A's type if A is a (not explicitly CAST()) column. This is
counter-intuitive and not mandated by the standard.
 
Disabling optimisation where it would be lossy so field value
will properly get promoted and compared as binary string (rather
than as integers).


mysql-test/include/ps_conv.inc:
  Bug #21103: DATE column not compared as DATE
  
  When comparing a DATE field with a DATETIME constant, we now compare
  as DATETIMEs, not as DATEs.  Fix certain queries to still work.
mysql-test/r/func_time.result:
  Bug #21103: DATE column not compared as DATE
  
  When comparing a DATE field with a DATETIME constant, we now compare
  as DATETIMEs, not as DATEs.  Show that everything works as expected.
mysql-test/r/ps_2myisam.result:
  Bug #21103: DATE column not compared as DATE
  
  When comparing a DATE field with a DATETIME constant, we now compare
  as DATETIMEs, not as DATEs.  Fix certain queries to still work.
mysql-test/r/ps_3innodb.result:
  Bug #21103: DATE column not compared as DATE
  
  When comparing a DATE field with a DATETIME constant, we now compare
  as DATETIMEs, not as DATEs.  Fix certain queries to still work.
mysql-test/r/ps_4heap.result:
  Bug #21103: DATE column not compared as DATE
  
  When comparing a DATE field with a DATETIME constant, we now compare
  as DATETIMEs, not as DATEs.  Fix certain queries to still work.
mysql-test/r/ps_5merge.result:
  Bug #21103: DATE column not compared as DATE
  
  When comparing a DATE field with a DATETIME constant, we now compare
  as DATETIMEs, not as DATEs.  Fix certain queries to still work.
mysql-test/r/ps_7ndb.result:
  Bug #21103: DATE column not compared as DATE
  
  When comparing a DATE field with a DATETIME constant, we now compare
  as DATETIMEs, not as DATEs.  Fix certain queries to still work.
mysql-test/t/func_time.test:
  Bug #21103: DATE column not compared as DATE
  
  When comparing a DATE field with a DATETIME constant, we now compare
  as DATETIMEs, not as DATEs.  Show that everything works as expected.
sql/field.cc:
  Bug #21103: DATE column not compared as DATE
  
  #0 stores the date only as a 3-byte integer; save_in_field() in
  #1 saves 'this' in field's format (DATE), #2 "converts a constant
  item to an int and replaces the original item" -- consequently,
  this replaces the Item_string "2006-11-06 04:08:36.0" with the
  Item_int_with_ref 20061106.
  
  #0  Field_newdate::store (this=0x8d26880, from=0x8d5e658 "2006-11-06
  04:08:36.0", len=21, cs=0x88022c0) at field.cc:5344
  #1  0x0817e3b0 in Item_string::save_in_field (this=0x8d5e670, field=0x8d26880, no_conversions=true) at item.cc:4340
  #2  0x081b22ae in convert_constant_item (thd=0x8d25240, field=0x8d26880, item=0x8d5e74c) at item_cmpfunc.cc:245
  #3  0x081b8a36 in Item_bool_func2::fix_length_and_dec (this=0x8d5e6f8) at item_cmpfunc.cc:309
  #4  0x081a3427 in Item_func::fix_fields (this=0x8d5e6f8, thd=0x8d25240, ref=0x8d5f5fc) at item_func.cc:190
  #5  0x0825bc2d in setup_conds (thd=0x8d25240, tables=0x8d5e410, leaves=0x8d5e410, conds=0x8d5f5fc) at sql_base.cc:4941
  ...
  
  Disabling optimisation where it would be lossy so field value will
  properly get promoted and compared as binary string (rather than as
  integers).

9 files changed, 85 insertions, 52 deletions

diff --git a/mysql-test/include/ps_conv.inc b/mysql-test/include/ps_conv.inc
index 0dd819f6e62..09290d760ce 100644
--- a/mysql-test/include/ps_conv.inc
+++ b/mysql-test/include/ps_conv.inc
@@ -1152,19 +1152,19 @@ select '-- select .. where date/time column = .. --' as test_sequence ;
 ######## SELECT .. WHERE column(date/time/..)=value(CHAR(n)/LONGTEXT) ########
 set @arg00= '1991-01-01 01:01:01' ;
 select 'true' as found from t9 
-where c1= 20 and c13= '1991-01-01 01:01:01' and c14= '1991-01-01 01:01:01' and
+where c1= 20 and c13= CAST('1991-01-01 01:01:01' AS DATE) and c14= '1991-01-01 01:01:01' and
   c15= '1991-01-01 01:01:01' and c16= '1991-01-01 01:01:01' and
   c17= '1991-01-01 01:01:01' ;
 select 'true' as found from t9 
-where c1= 20 and c13= @arg00 and c14= @arg00 and c15= @arg00 and c16= @arg00
+where c1= 20 and c13= CAST(@arg00 AS DATE) and c14= @arg00 and c15= @arg00 and c16= @arg00
   and c17= @arg00 ;
 prepare stmt1 from "select 'true' as found from t9 
-where c1= 20 and c13= '1991-01-01 01:01:01' and c14= '1991-01-01 01:01:01' and
+where c1= 20 and c13= CAST('1991-01-01 01:01:01' AS DATE) and c14= '1991-01-01 01:01:01' and
   c15= '1991-01-01 01:01:01' and c16= '1991-01-01 01:01:01' and
   c17= '1991-01-01 01:01:01'" ;
 execute stmt1 ;
 prepare stmt1 from "select 'true' as found from t9 
-where c1= 20 and c13= ? and c14= ? and c15= ? and c16= ? and c17= ?" ;
+where c1= 20 and c13= CAST(? AS DATE) and c14= ? and c15= ? and c16= ? and c17= ?" ;
 execute stmt1 using @arg00, @arg00, @arg00, @arg00, @arg00 ;
 
 
@@ -1177,7 +1177,7 @@ where c1= 20 and c13= CAST('1991-01-01 01:01:01' as datetime) and
   c16= CAST('1991-01-01 01:01:01' as datetime) and
   c17= CAST('1991-01-01 01:01:01' as datetime) ;
 select 'true' as found from t9 
-where c1= 20 and c13= @arg00 and c14= @arg00 and c15= @arg00 and c16= @arg00
+where c1= 20 and c13= CAST(@arg00 AS DATE) and c14= @arg00 and c15= @arg00 and c16= @arg00
   and c17= @arg00 ;
 prepare stmt1 from "select 'true' as found from t9 
 where c1= 20 and c13= CAST('1991-01-01 01:01:01' as datetime) and
@@ -1187,7 +1187,7 @@ where c1= 20 and c13= CAST('1991-01-01 01:01:01' as datetime) and
   c17= CAST('1991-01-01 01:01:01' as datetime)" ;
 execute stmt1 ;
 prepare stmt1 from "select 'true' as found from t9 
-where c1= 20 and c13= ? and c14= ? and c15= ? and c16= ? and c17= ?" ;
+where c1= 20 and c13= CAST(? AS DATE) and c14= ? and c15= ? and c16= ? and c17= ?" ;
 execute stmt1 using @arg00, @arg00, @arg00, @arg00, @arg00 ;
 
 
diff --git a/mysql-test/r/func_time.result b/mysql-test/r/func_time.result
index 32f930ca6ba..a5af2217684 100644
--- a/mysql-test/r/func_time.result
+++ b/mysql-test/r/func_time.result
@@ -1207,6 +1207,23 @@ SET NAMES DEFAULT;
 select str_to_date('10:00 PM', '%h:%i %p') + INTERVAL 10 MINUTE;
 str_to_date('10:00 PM', '%h:%i %p') + INTERVAL 10 MINUTE
 NULL
+create table t1 (field DATE);
+insert into t1 values ('2006-11-06');
+select * from t1 where field < '2006-11-06 04:08:36.0';
+field
+2006-11-06
+select * from t1 where field = '2006-11-06 04:08:36.0';
+field
+select * from t1 where field = '2006-11-06';
+field
+2006-11-06
+select * from t1 where CAST(field as DATETIME) < '2006-11-06 04:08:36.0';
+field
+2006-11-06
+select * from t1 where CAST(field as DATE) < '2006-11-06 04:08:36.0';
+field
+2006-11-06
+drop table t1;
 CREATE TABLE t1 (a int, t1 time, t2 time, d date, PRIMARY KEY  (a));
 INSERT INTO t1 VALUES (1, '10:00:00', NULL, NULL), 
 (2, '11:00:00', '11:15:00', '1972-02-06');
diff --git a/mysql-test/r/ps_2myisam.result b/mysql-test/r/ps_2myisam.result
index 2a7b0e959af..de6e2d62763 100644
--- a/mysql-test/r/ps_2myisam.result
+++ b/mysql-test/r/ps_2myisam.result
@@ -3046,25 +3046,25 @@ test_sequence
 -- select .. where date/time column = .. --
 set @arg00= '1991-01-01 01:01:01' ;
 select 'true' as found from t9 
-where c1= 20 and c13= '1991-01-01 01:01:01' and c14= '1991-01-01 01:01:01' and
+where c1= 20 and c13= CAST('1991-01-01 01:01:01' AS DATE) and c14= '1991-01-01 01:01:01' and
 c15= '1991-01-01 01:01:01' and c16= '1991-01-01 01:01:01' and
 c17= '1991-01-01 01:01:01' ;
 found
 true
 select 'true' as found from t9 
-where c1= 20 and c13= @arg00 and c14= @arg00 and c15= @arg00 and c16= @arg00
+where c1= 20 and c13= CAST(@arg00 AS DATE) and c14= @arg00 and c15= @arg00 and c16= @arg00
 and c17= @arg00 ;
 found
 true
 prepare stmt1 from "select 'true' as found from t9 
-where c1= 20 and c13= '1991-01-01 01:01:01' and c14= '1991-01-01 01:01:01' and
+where c1= 20 and c13= CAST('1991-01-01 01:01:01' AS DATE) and c14= '1991-01-01 01:01:01' and
   c15= '1991-01-01 01:01:01' and c16= '1991-01-01 01:01:01' and
   c17= '1991-01-01 01:01:01'" ;
 execute stmt1 ;
 found
 true
 prepare stmt1 from "select 'true' as found from t9 
-where c1= 20 and c13= ? and c14= ? and c15= ? and c16= ? and c17= ?" ;
+where c1= 20 and c13= CAST(? AS DATE) and c14= ? and c15= ? and c16= ? and c17= ?" ;
 execute stmt1 using @arg00, @arg00, @arg00, @arg00, @arg00 ;
 found
 true
@@ -3078,7 +3078,7 @@ c17= CAST('1991-01-01 01:01:01' as datetime) ;
 found
 true
 select 'true' as found from t9 
-where c1= 20 and c13= @arg00 and c14= @arg00 and c15= @arg00 and c16= @arg00
+where c1= 20 and c13= CAST(@arg00 AS DATE) and c14= @arg00 and c15= @arg00 and c16= @arg00
 and c17= @arg00 ;
 found
 true
@@ -3092,7 +3092,7 @@ execute stmt1 ;
 found
 true
 prepare stmt1 from "select 'true' as found from t9 
-where c1= 20 and c13= ? and c14= ? and c15= ? and c16= ? and c17= ?" ;
+where c1= 20 and c13= CAST(? AS DATE) and c14= ? and c15= ? and c16= ? and c17= ?" ;
 execute stmt1 using @arg00, @arg00, @arg00, @arg00, @arg00 ;
 found
 true
diff --git a/mysql-test/r/ps_3innodb.result b/mysql-test/r/ps_3innodb.result
index 88e8bf3ce04..1ebaafdd488 100644
--- a/mysql-test/r/ps_3innodb.result
+++ b/mysql-test/r/ps_3innodb.result
@@ -3029,25 +3029,25 @@ test_sequence
 -- select .. where date/time column = .. --
 set @arg00= '1991-01-01 01:01:01' ;
 select 'true' as found from t9 
-where c1= 20 and c13= '1991-01-01 01:01:01' and c14= '1991-01-01 01:01:01' and
+where c1= 20 and c13= CAST('1991-01-01 01:01:01' AS DATE) and c14= '1991-01-01 01:01:01' and
 c15= '1991-01-01 01:01:01' and c16= '1991-01-01 01:01:01' and
 c17= '1991-01-01 01:01:01' ;
 found
 true
 select 'true' as found from t9 
-where c1= 20 and c13= @arg00 and c14= @arg00 and c15= @arg00 and c16= @arg00
+where c1= 20 and c13= CAST(@arg00 AS DATE) and c14= @arg00 and c15= @arg00 and c16= @arg00
 and c17= @arg00 ;
 found
 true
 prepare stmt1 from "select 'true' as found from t9 
-where c1= 20 and c13= '1991-01-01 01:01:01' and c14= '1991-01-01 01:01:01' and
+where c1= 20 and c13= CAST('1991-01-01 01:01:01' AS DATE) and c14= '1991-01-01 01:01:01' and
   c15= '1991-01-01 01:01:01' and c16= '1991-01-01 01:01:01' and
   c17= '1991-01-01 01:01:01'" ;
 execute stmt1 ;
 found
 true
 prepare stmt1 from "select 'true' as found from t9 
-where c1= 20 and c13= ? and c14= ? and c15= ? and c16= ? and c17= ?" ;
+where c1= 20 and c13= CAST(? AS DATE) and c14= ? and c15= ? and c16= ? and c17= ?" ;
 execute stmt1 using @arg00, @arg00, @arg00, @arg00, @arg00 ;
 found
 true
@@ -3061,7 +3061,7 @@ c17= CAST('1991-01-01 01:01:01' as datetime) ;
 found
 true
 select 'true' as found from t9 
-where c1= 20 and c13= @arg00 and c14= @arg00 and c15= @arg00 and c16= @arg00
+where c1= 20 and c13= CAST(@arg00 AS DATE) and c14= @arg00 and c15= @arg00 and c16= @arg00
 and c17= @arg00 ;
 found
 true
@@ -3075,7 +3075,7 @@ execute stmt1 ;
 found
 true
 prepare stmt1 from "select 'true' as found from t9 
-where c1= 20 and c13= ? and c14= ? and c15= ? and c16= ? and c17= ?" ;
+where c1= 20 and c13= CAST(? AS DATE) and c14= ? and c15= ? and c16= ? and c17= ?" ;
 execute stmt1 using @arg00, @arg00, @arg00, @arg00, @arg00 ;
 found
 true
diff --git a/mysql-test/r/ps_4heap.result b/mysql-test/r/ps_4heap.result
index 0e4c6fc3077..74b9326dbc1 100644
--- a/mysql-test/r/ps_4heap.result
+++ b/mysql-test/r/ps_4heap.result
@@ -3030,25 +3030,25 @@ test_sequence
 -- select .. where date/time column = .. --
 set @arg00= '1991-01-01 01:01:01' ;
 select 'true' as found from t9 
-where c1= 20 and c13= '1991-01-01 01:01:01' and c14= '1991-01-01 01:01:01' and
+where c1= 20 and c13= CAST('1991-01-01 01:01:01' AS DATE) and c14= '1991-01-01 01:01:01' and
 c15= '1991-01-01 01:01:01' and c16= '1991-01-01 01:01:01' and
 c17= '1991-01-01 01:01:01' ;
 found
 true
 select 'true' as found from t9 
-where c1= 20 and c13= @arg00 and c14= @arg00 and c15= @arg00 and c16= @arg00
+where c1= 20 and c13= CAST(@arg00 AS DATE) and c14= @arg00 and c15= @arg00 and c16= @arg00
 and c17= @arg00 ;
 found
 true
 prepare stmt1 from "select 'true' as found from t9 
-where c1= 20 and c13= '1991-01-01 01:01:01' and c14= '1991-01-01 01:01:01' and
+where c1= 20 and c13= CAST('1991-01-01 01:01:01' AS DATE) and c14= '1991-01-01 01:01:01' and
   c15= '1991-01-01 01:01:01' and c16= '1991-01-01 01:01:01' and
   c17= '1991-01-01 01:01:01'" ;
 execute stmt1 ;
 found
 true
 prepare stmt1 from "select 'true' as found from t9 
-where c1= 20 and c13= ? and c14= ? and c15= ? and c16= ? and c17= ?" ;
+where c1= 20 and c13= CAST(? AS DATE) and c14= ? and c15= ? and c16= ? and c17= ?" ;
 execute stmt1 using @arg00, @arg00, @arg00, @arg00, @arg00 ;
 found
 true
@@ -3062,7 +3062,7 @@ c17= CAST('1991-01-01 01:01:01' as datetime) ;
 found
 true
 select 'true' as found from t9 
-where c1= 20 and c13= @arg00 and c14= @arg00 and c15= @arg00 and c16= @arg00
+where c1= 20 and c13= CAST(@arg00 AS DATE) and c14= @arg00 and c15= @arg00 and c16= @arg00
 and c17= @arg00 ;
 found
 true
@@ -3076,7 +3076,7 @@ execute stmt1 ;
 found
 true
 prepare stmt1 from "select 'true' as found from t9 
-where c1= 20 and c13= ? and c14= ? and c15= ? and c16= ? and c17= ?" ;
+where c1= 20 and c13= CAST(? AS DATE) and c14= ? and c15= ? and c16= ? and c17= ?" ;
 execute stmt1 using @arg00, @arg00, @arg00, @arg00, @arg00 ;
 found
 true
diff --git a/mysql-test/r/ps_5merge.result b/mysql-test/r/ps_5merge.result
index 1e337072ecb..bf80514906b 100644
--- a/mysql-test/r/ps_5merge.result
+++ b/mysql-test/r/ps_5merge.result
@@ -2966,25 +2966,25 @@ test_sequence
 -- select .. where date/time column = .. --
 set @arg00= '1991-01-01 01:01:01' ;
 select 'true' as found from t9 
-where c1= 20 and c13= '1991-01-01 01:01:01' and c14= '1991-01-01 01:01:01' and
+where c1= 20 and c13= CAST('1991-01-01 01:01:01' AS DATE) and c14= '1991-01-01 01:01:01' and
 c15= '1991-01-01 01:01:01' and c16= '1991-01-01 01:01:01' and
 c17= '1991-01-01 01:01:01' ;
 found
 true
 select 'true' as found from t9 
-where c1= 20 and c13= @arg00 and c14= @arg00 and c15= @arg00 and c16= @arg00
+where c1= 20 and c13= CAST(@arg00 AS DATE) and c14= @arg00 and c15= @arg00 and c16= @arg00
 and c17= @arg00 ;
 found
 true
 prepare stmt1 from "select 'true' as found from t9 
-where c1= 20 and c13= '1991-01-01 01:01:01' and c14= '1991-01-01 01:01:01' and
+where c1= 20 and c13= CAST('1991-01-01 01:01:01' AS DATE) and c14= '1991-01-01 01:01:01' and
   c15= '1991-01-01 01:01:01' and c16= '1991-01-01 01:01:01' and
   c17= '1991-01-01 01:01:01'" ;
 execute stmt1 ;
 found
 true
 prepare stmt1 from "select 'true' as found from t9 
-where c1= 20 and c13= ? and c14= ? and c15= ? and c16= ? and c17= ?" ;
+where c1= 20 and c13= CAST(? AS DATE) and c14= ? and c15= ? and c16= ? and c17= ?" ;
 execute stmt1 using @arg00, @arg00, @arg00, @arg00, @arg00 ;
 found
 true
@@ -2998,7 +2998,7 @@ c17= CAST('1991-01-01 01:01:01' as datetime) ;
 found
 true
 select 'true' as found from t9 
-where c1= 20 and c13= @arg00 and c14= @arg00 and c15= @arg00 and c16= @arg00
+where c1= 20 and c13= CAST(@arg00 AS DATE) and c14= @arg00 and c15= @arg00 and c16= @arg00
 and c17= @arg00 ;
 found
 true
@@ -3012,7 +3012,7 @@ execute stmt1 ;
 found
 true
 prepare stmt1 from "select 'true' as found from t9 
-where c1= 20 and c13= ? and c14= ? and c15= ? and c16= ? and c17= ?" ;
+where c1= 20 and c13= CAST(? AS DATE) and c14= ? and c15= ? and c16= ? and c17= ?" ;
 execute stmt1 using @arg00, @arg00, @arg00, @arg00, @arg00 ;
 found
 true
@@ -5980,25 +5980,25 @@ test_sequence
 -- select .. where date/time column = .. --
 set @arg00= '1991-01-01 01:01:01' ;
 select 'true' as found from t9 
-where c1= 20 and c13= '1991-01-01 01:01:01' and c14= '1991-01-01 01:01:01' and
+where c1= 20 and c13= CAST('1991-01-01 01:01:01' AS DATE) and c14= '1991-01-01 01:01:01' and
 c15= '1991-01-01 01:01:01' and c16= '1991-01-01 01:01:01' and
 c17= '1991-01-01 01:01:01' ;
 found
 true
 select 'true' as found from t9 
-where c1= 20 and c13= @arg00 and c14= @arg00 and c15= @arg00 and c16= @arg00
+where c1= 20 and c13= CAST(@arg00 AS DATE) and c14= @arg00 and c15= @arg00 and c16= @arg00
 and c17= @arg00 ;
 found
 true
 prepare stmt1 from "select 'true' as found from t9 
-where c1= 20 and c13= '1991-01-01 01:01:01' and c14= '1991-01-01 01:01:01' and
+where c1= 20 and c13= CAST('1991-01-01 01:01:01' AS DATE) and c14= '1991-01-01 01:01:01' and
   c15= '1991-01-01 01:01:01' and c16= '1991-01-01 01:01:01' and
   c17= '1991-01-01 01:01:01'" ;
 execute stmt1 ;
 found
 true
 prepare stmt1 from "select 'true' as found from t9 
-where c1= 20 and c13= ? and c14= ? and c15= ? and c16= ? and c17= ?" ;
+where c1= 20 and c13= CAST(? AS DATE) and c14= ? and c15= ? and c16= ? and c17= ?" ;
 execute stmt1 using @arg00, @arg00, @arg00, @arg00, @arg00 ;
 found
 true
@@ -6012,7 +6012,7 @@ c17= CAST('1991-01-01 01:01:01' as datetime) ;
 found
 true
 select 'true' as found from t9 
-where c1= 20 and c13= @arg00 and c14= @arg00 and c15= @arg00 and c16= @arg00
+where c1= 20 and c13= CAST(@arg00 AS DATE) and c14= @arg00 and c15= @arg00 and c16= @arg00
 and c17= @arg00 ;
 found
 true
@@ -6026,7 +6026,7 @@ execute stmt1 ;
 found
 true
 prepare stmt1 from "select 'true' as found from t9 
-where c1= 20 and c13= ? and c14= ? and c15= ? and c16= ? and c17= ?" ;
+where c1= 20 and c13= CAST(? AS DATE) and c14= ? and c15= ? and c16= ? and c17= ?" ;
 execute stmt1 using @arg00, @arg00, @arg00, @arg00, @arg00 ;
 found
 true
diff --git a/mysql-test/r/ps_7ndb.result b/mysql-test/r/ps_7ndb.result
index c84cced15f5..e8358098ee7 100644
--- a/mysql-test/r/ps_7ndb.result
+++ b/mysql-test/r/ps_7ndb.result
@@ -3029,25 +3029,25 @@ test_sequence
 -- select .. where date/time column = .. --
 set @arg00= '1991-01-01 01:01:01' ;
 select 'true' as found from t9 
-where c1= 20 and c13= '1991-01-01 01:01:01' and c14= '1991-01-01 01:01:01' and
+where c1= 20 and c13= CAST('1991-01-01 01:01:01' AS DATE) and c14= '1991-01-01 01:01:01' and
 c15= '1991-01-01 01:01:01' and c16= '1991-01-01 01:01:01' and
 c17= '1991-01-01 01:01:01' ;
 found
 true
 select 'true' as found from t9 
-where c1= 20 and c13= @arg00 and c14= @arg00 and c15= @arg00 and c16= @arg00
+where c1= 20 and c13= CAST(@arg00 AS DATE) and c14= @arg00 and c15= @arg00 and c16= @arg00
 and c17= @arg00 ;
 found
 true
 prepare stmt1 from "select 'true' as found from t9 
-where c1= 20 and c13= '1991-01-01 01:01:01' and c14= '1991-01-01 01:01:01' and
+where c1= 20 and c13= CAST('1991-01-01 01:01:01' AS DATE) and c14= '1991-01-01 01:01:01' and
   c15= '1991-01-01 01:01:01' and c16= '1991-01-01 01:01:01' and
   c17= '1991-01-01 01:01:01'" ;
 execute stmt1 ;
 found
 true
 prepare stmt1 from "select 'true' as found from t9 
-where c1= 20 and c13= ? and c14= ? and c15= ? and c16= ? and c17= ?" ;
+where c1= 20 and c13= CAST(? AS DATE) and c14= ? and c15= ? and c16= ? and c17= ?" ;
 execute stmt1 using @arg00, @arg00, @arg00, @arg00, @arg00 ;
 found
 true
@@ -3061,7 +3061,7 @@ c17= CAST('1991-01-01 01:01:01' as datetime) ;
 found
 true
 select 'true' as found from t9 
-where c1= 20 and c13= @arg00 and c14= @arg00 and c15= @arg00 and c16= @arg00
+where c1= 20 and c13= CAST(@arg00 AS DATE) and c14= @arg00 and c15= @arg00 and c16= @arg00
 and c17= @arg00 ;
 found
 true
@@ -3075,7 +3075,7 @@ execute stmt1 ;
 found
 true
 prepare stmt1 from "select 'true' as found from t9 
-where c1= 20 and c13= ? and c14= ? and c15= ? and c16= ? and c17= ?" ;
+where c1= 20 and c13= CAST(? AS DATE) and c14= ? and c15= ? and c16= ? and c17= ?" ;
 execute stmt1 using @arg00, @arg00, @arg00, @arg00, @arg00 ;
 found
 true
diff --git a/mysql-test/t/func_time.test b/mysql-test/t/func_time.test
index 1aa4b434a83..ab904b187a3 100644
--- a/mysql-test/t/func_time.test
+++ b/mysql-test/t/func_time.test
@@ -715,6 +715,19 @@ SET NAMES DEFAULT;
 select str_to_date('10:00 PM', '%h:%i %p') + INTERVAL 10 MINUTE;
 
 #
+# Bug #21103: DATE column not compared as DATE
+#
+
+create table t1 (field DATE);
+insert into t1 values ('2006-11-06');
+select * from t1 where field < '2006-11-06 04:08:36.0'; 
+select * from t1 where field = '2006-11-06 04:08:36.0'; 
+select * from t1 where field = '2006-11-06'; 
+select * from t1 where CAST(field as DATETIME) < '2006-11-06 04:08:36.0';
+select * from t1 where CAST(field as DATE) < '2006-11-06 04:08:36.0';
+drop table t1;
+
+#
 # Bug #25643: SEC_TO_TIME function problem
 #
 CREATE TABLE t1 (a int, t1 time, t2 time, d date, PRIMARY KEY  (a));
diff --git a/sql/field.cc b/sql/field.cc
index 74a5e742c06..54e5c362f0d 100644
--- a/sql/field.cc
+++ b/sql/field.cc
@@ -5338,27 +5338,30 @@ void Field_date::sql_type(String &res) const
 int Field_newdate::store(const char *from,uint len,CHARSET_INFO *cs)
 {
   TIME l_time;
-  long tmp;
   int error;
   THD *thd= table ? table->in_use : current_thd;
-  if (str_to_datetime(from, len, &l_time,
-                      (TIME_FUZZY_DATE |
-                       (thd->variables.sql_mode &
-                        (MODE_NO_ZERO_IN_DATE | MODE_NO_ZERO_DATE |
-                         MODE_INVALID_DATES))),
-                      &error) <= MYSQL_TIMESTAMP_ERROR)
+  enum enum_mysql_timestamp_type ret;
+  if ((ret= str_to_datetime(from, len, &l_time,
+                            (TIME_FUZZY_DATE |
+                             (thd->variables.sql_mode &
+                              (MODE_NO_ZERO_IN_DATE | MODE_NO_ZERO_DATE |
+                               MODE_INVALID_DATES))),
+                            &error)) <= MYSQL_TIMESTAMP_ERROR)
   {
-    tmp= 0L;
+    int3store(ptr,0L);
     error= 2;
   }
   else
-    tmp= l_time.day + l_time.month*32 + l_time.year*16*32;
+  {
+    int3store(ptr, l_time.day + l_time.month*32 + l_time.year*16*32);
+    if(!error && (ret != MYSQL_TIMESTAMP_DATE))
+      return 2;
+  }
 
   if (error)
     set_datetime_warning(MYSQL_ERROR::WARN_LEVEL_WARN, WARN_DATA_TRUNCATED,
                          from, len, MYSQL_TIMESTAMP_DATE, 1);
 
-  int3store(ptr,tmp);
   return error;
 }