Merge

9 files changed, 501 insertions, 106 deletions

diff --git a/mysql-test/r/select.result b/mysql-test/r/select.result
index d0b2a575a32..f38af4ceb32 100644
--- a/mysql-test/r/select.result
+++ b/mysql-test/r/select.result
@@ -4609,4 +4609,29 @@ HAVING v <= 't'
 ORDER BY pk;
 v
 DROP TABLE t1;
+#
+# Bug#49489 Uninitialized cache led to a wrong result.
+#
+CREATE TABLE t1(c1 DOUBLE(5,4));
+INSERT INTO t1 VALUES (9.1234);
+SELECT * FROM t1 WHERE c1 < 9.12345;
+c1
+9.1234
+DROP TABLE t1;
+# End of test for bug#49489.
+#
+# Bug #49517: Inconsistent behavior while using 
+# NULLable BIGINT and INT columns in comparison
+#
+CREATE TABLE t1(a BIGINT UNSIGNED NOT NULL, b BIGINT NULL, c INT NULL);
+INSERT INTO t1 VALUES(105, NULL, NULL);
+SELECT * FROM t1 WHERE b < 102;
+a	b	c
+SELECT * FROM t1 WHERE c < 102;
+a	b	c
+SELECT * FROM t1 WHERE 102 < b;
+a	b	c
+SELECT * FROM t1 WHERE 102 < c;
+a	b	c
+DROP TABLE t1;
 End of 5.1 tests
diff --git a/mysql-test/r/show_check.result b/mysql-test/r/show_check.result
index e6550bee954..ec0a70ff581 100644
--- a/mysql-test/r/show_check.result
+++ b/mysql-test/r/show_check.result
@@ -1454,4 +1454,10 @@ GRANT PROCESS ON *.* TO test_u@localhost;
 SHOW ENGINE MYISAM MUTEX;
 SHOW ENGINE MYISAM STATUS;
 DROP USER test_u@localhost;
+#
+# Bug #48985: show create table crashes if previous access to the table
+#    was killed
+#
+SHOW CREATE TABLE non_existent;
+ERROR 70100: Query execution was interrupted
 End of 5.1 tests
diff --git a/mysql-test/r/type_year.result b/mysql-test/r/type_year.result
index e52947455c8..56b326327c6 100644
--- a/mysql-test/r/type_year.result
+++ b/mysql-test/r/type_year.result
@@ -46,3 +46,267 @@ a
 2001
 drop table t1;
 End of 5.0 tests
+#
+# Bug #49480: WHERE using YEAR columns returns unexpected results
+#
+CREATE TABLE t2(yy YEAR(2), c2 CHAR(4));
+CREATE TABLE t4(yyyy YEAR(4), c4 CHAR(4));
+INSERT INTO t2 (c2) VALUES (NULL),(1970),(1999),(2000),(2001),(2069);
+INSERT INTO t4 (c4) SELECT c2 FROM t2;
+UPDATE t2 SET yy = c2;
+UPDATE t4 SET yyyy = c4;
+SELECT * FROM t2;
+yy	c2
+NULL	NULL
+70	1970
+99	1999
+00	2000
+01	2001
+69	2069
+SELECT * FROM t4;
+yyyy	c4
+NULL	NULL
+1970	1970
+1999	1999
+2000	2000
+2001	2001
+2069	2069
+# Comparison of YEAR(2) with YEAR(4)
+SELECT * FROM t2, t4 WHERE yy = yyyy;
+yy	c2	yyyy	c4
+70	1970	1970	1970
+99	1999	1999	1999
+00	2000	2000	2000
+01	2001	2001	2001
+69	2069	2069	2069
+SELECT * FROM t2, t4 WHERE yy <=> yyyy;
+yy	c2	yyyy	c4
+NULL	NULL	NULL	NULL
+70	1970	1970	1970
+99	1999	1999	1999
+00	2000	2000	2000
+01	2001	2001	2001
+69	2069	2069	2069
+SELECT * FROM t2, t4 WHERE yy < yyyy;
+yy	c2	yyyy	c4
+70	1970	1999	1999
+70	1970	2000	2000
+99	1999	2000	2000
+70	1970	2001	2001
+99	1999	2001	2001
+00	2000	2001	2001
+70	1970	2069	2069
+99	1999	2069	2069
+00	2000	2069	2069
+01	2001	2069	2069
+SELECT * FROM t2, t4 WHERE yy > yyyy;
+yy	c2	yyyy	c4
+99	1999	1970	1970
+00	2000	1970	1970
+01	2001	1970	1970
+69	2069	1970	1970
+00	2000	1999	1999
+01	2001	1999	1999
+69	2069	1999	1999
+01	2001	2000	2000
+69	2069	2000	2000
+69	2069	2001	2001
+# Comparison of YEAR(2) with YEAR(2)
+SELECT * FROM t2 a, t2 b WHERE a.yy = b.yy;
+yy	c2	yy	c2
+70	1970	70	1970
+99	1999	99	1999
+00	2000	00	2000
+01	2001	01	2001
+69	2069	69	2069
+SELECT * FROM t2 a, t2 b WHERE a.yy <=> b.yy;
+yy	c2	yy	c2
+NULL	NULL	NULL	NULL
+70	1970	70	1970
+99	1999	99	1999
+00	2000	00	2000
+01	2001	01	2001
+69	2069	69	2069
+SELECT * FROM t2 a, t2 b WHERE a.yy < b.yy;
+yy	c2	yy	c2
+70	1970	99	1999
+70	1970	00	2000
+99	1999	00	2000
+70	1970	01	2001
+99	1999	01	2001
+00	2000	01	2001
+70	1970	69	2069
+99	1999	69	2069
+00	2000	69	2069
+01	2001	69	2069
+# Comparison of YEAR(4) with YEAR(4)
+SELECT * FROM t4 a, t4 b WHERE a.yyyy = b.yyyy;
+yyyy	c4	yyyy	c4
+1970	1970	1970	1970
+1999	1999	1999	1999
+2000	2000	2000	2000
+2001	2001	2001	2001
+2069	2069	2069	2069
+SELECT * FROM t4 a, t4 b WHERE a.yyyy <=> b.yyyy;
+yyyy	c4	yyyy	c4
+NULL	NULL	NULL	NULL
+1970	1970	1970	1970
+1999	1999	1999	1999
+2000	2000	2000	2000
+2001	2001	2001	2001
+2069	2069	2069	2069
+SELECT * FROM t4 a, t4 b WHERE a.yyyy < b.yyyy;
+yyyy	c4	yyyy	c4
+1970	1970	1999	1999
+1970	1970	2000	2000
+1999	1999	2000	2000
+1970	1970	2001	2001
+1999	1999	2001	2001
+2000	2000	2001	2001
+1970	1970	2069	2069
+1999	1999	2069	2069
+2000	2000	2069	2069
+2001	2001	2069	2069
+# Comparison with constants:
+SELECT * FROM t2 WHERE yy = NULL;
+yy	c2
+SELECT * FROM t4 WHERE yyyy = NULL;
+yyyy	c4
+SELECT * FROM t2 WHERE yy <=> NULL;
+yy	c2
+NULL	NULL
+SELECT * FROM t4 WHERE yyyy <=> NULL;
+yyyy	c4
+NULL	NULL
+SELECT * FROM t2 WHERE yy < NULL;
+yy	c2
+SELECT * FROM t2 WHERE yy > NULL;
+yy	c2
+SELECT * FROM t2 WHERE yy = NOW();
+yy	c2
+SELECT * FROM t4 WHERE yyyy = NOW();
+yyyy	c4
+SELECT * FROM t2 WHERE yy = 99;
+yy	c2
+99	1999
+SELECT * FROM t2 WHERE 99 = yy;
+yy	c2
+99	1999
+SELECT * FROM t4 WHERE yyyy = 99;
+yyyy	c4
+1999	1999
+SELECT * FROM t2 WHERE yy = 'test';
+yy	c2
+00	2000
+Warnings:
+Warning	1292	Truncated incorrect DOUBLE value: 'test'
+SELECT * FROM t4 WHERE yyyy = 'test';
+yyyy	c4
+Warnings:
+Warning	1292	Truncated incorrect DOUBLE value: 'test'
+SELECT * FROM t2 WHERE yy = '1999';
+yy	c2
+99	1999
+SELECT * FROM t4 WHERE yyyy = '1999';
+yyyy	c4
+1999	1999
+SELECT * FROM t2 WHERE yy = 1999;
+yy	c2
+99	1999
+SELECT * FROM t4 WHERE yyyy = 1999;
+yyyy	c4
+1999	1999
+SELECT * FROM t2 WHERE yy = 1999.1;
+yy	c2
+99	1999
+SELECT * FROM t4 WHERE yyyy = 1999.1;
+yyyy	c4
+1999	1999
+SELECT * FROM t2 WHERE yy = 1998.9;
+yy	c2
+99	1999
+SELECT * FROM t4 WHERE yyyy = 1998.9;
+yyyy	c4
+1999	1999
+# Coverage tests for YEAR with zero/2000 constants:
+SELECT * FROM t2 WHERE yy = 0;
+yy	c2
+00	2000
+SELECT * FROM t2 WHERE yy = '0';
+yy	c2
+00	2000
+SELECT * FROM t2 WHERE yy = '0000';
+yy	c2
+00	2000
+SELECT * FROM t2 WHERE yy = '2000';
+yy	c2
+00	2000
+SELECT * FROM t2 WHERE yy = 2000;
+yy	c2
+00	2000
+SELECT * FROM t4 WHERE yyyy = 0;
+yyyy	c4
+SELECT * FROM t4 WHERE yyyy = '0';
+yyyy	c4
+2000	2000
+SELECT * FROM t4 WHERE yyyy = '0000';
+yyyy	c4
+SELECT * FROM t4 WHERE yyyy = '2000';
+yyyy	c4
+2000	2000
+SELECT * FROM t4 WHERE yyyy = 2000;
+yyyy	c4
+2000	2000
+# Comparison with constants those are out of YEAR range
+# (coverage test for backward compatibility)
+SELECT COUNT(yy) FROM t2;
+COUNT(yy)
+5
+SELECT COUNT(yyyy) FROM t4;
+COUNT(yyyy)
+5
+SELECT COUNT(*) FROM t2 WHERE yy = -1;
+COUNT(*)
+0
+SELECT COUNT(*) FROM t4 WHERE yyyy > -1;
+COUNT(*)
+5
+SELECT COUNT(*) FROM t2 WHERE yy > -1000000000000000000;
+COUNT(*)
+5
+SELECT COUNT(*) FROM t4 WHERE yyyy > -1000000000000000000;
+COUNT(*)
+5
+SELECT COUNT(*) FROM t2 WHERE yy < 2156;
+COUNT(*)
+5
+SELECT COUNT(*) FROM t4 WHERE yyyy < 2156;
+COUNT(*)
+5
+SELECT COUNT(*) FROM t2 WHERE yy < 1000000000000000000;
+COUNT(*)
+5
+SELECT COUNT(*) FROM t4 WHERE yyyy < 1000000000000000000;
+COUNT(*)
+5
+SELECT * FROM t2 WHERE yy < 123;
+yy	c2
+70	1970
+99	1999
+00	2000
+01	2001
+69	2069
+SELECT * FROM t2 WHERE yy > 123;
+yy	c2
+SELECT * FROM t4 WHERE yyyy < 123;
+yyyy	c4
+SELECT * FROM t4 WHERE yyyy > 123;
+yyyy	c4
+1970	1970
+1999	1999
+2000	2000
+2001	2001
+2069	2069
+DROP TABLE t2, t4;
+#
+End of 5.1 tests
diff --git a/mysql-test/t/select.test b/mysql-test/t/select.test
index ac65e5cbaf5..e81c298166d 100644
--- a/mysql-test/t/select.test
+++ b/mysql-test/t/select.test
@@ -3964,4 +3964,27 @@ ORDER BY pk;
 
 DROP TABLE t1;
 
+--echo #
+--echo # Bug#49489 Uninitialized cache led to a wrong result.
+--echo #
+CREATE TABLE t1(c1 DOUBLE(5,4));
+INSERT INTO t1 VALUES (9.1234);
+SELECT * FROM t1 WHERE c1 < 9.12345;
+DROP TABLE t1;
+--echo # End of test for bug#49489.
+
+
+--echo #
+--echo # Bug #49517: Inconsistent behavior while using 
+--echo # NULLable BIGINT and INT columns in comparison
+--echo #
+CREATE TABLE t1(a BIGINT UNSIGNED NOT NULL, b BIGINT NULL, c INT NULL);
+INSERT INTO t1 VALUES(105, NULL, NULL);
+SELECT * FROM t1 WHERE b < 102;
+SELECT * FROM t1 WHERE c < 102;
+SELECT * FROM t1 WHERE 102 < b;
+SELECT * FROM t1 WHERE 102 < c;
+DROP TABLE t1;
+
+
 --echo End of 5.1 tests
diff --git a/mysql-test/t/show_check.test b/mysql-test/t/show_check.test
index 0ce807ae73e..d46261f38d2 100644
--- a/mysql-test/t/show_check.test
+++ b/mysql-test/t/show_check.test
@@ -1207,6 +1207,28 @@ connection default;
 DROP USER test_u@localhost;
 
 
+--echo #
+--echo # Bug #48985: show create table crashes if previous access to the table
+--echo #    was killed
+--echo #
+
+connect(con1,localhost,root,,);
+CONNECTION con1;
+LET $ID= `SELECT connection_id()`;
+
+CONNECTION default;
+--disable_query_log
+eval KILL QUERY $ID;
+--enable_query_log
+
+CONNECTION con1;
+--error ER_QUERY_INTERRUPTED
+SHOW CREATE TABLE non_existent;
+
+CONNECTION default;
+DISCONNECT con1;
+
+
 --echo End of 5.1 tests
 
 # Wait till all disconnects are completed
diff --git a/mysql-test/t/type_year.test b/mysql-test/t/type_year.test
index 0e174a556d6..16fd39a59d8 100644
--- a/mysql-test/t/type_year.test
+++ b/mysql-test/t/type_year.test
@@ -30,3 +30,109 @@ select * from t1;
 drop table t1;
 
 --echo End of 5.0 tests
+
+--echo #
+--echo # Bug #49480: WHERE using YEAR columns returns unexpected results
+--echo #
+
+CREATE TABLE t2(yy YEAR(2), c2 CHAR(4));
+CREATE TABLE t4(yyyy YEAR(4), c4 CHAR(4));
+
+INSERT INTO t2 (c2) VALUES (NULL),(1970),(1999),(2000),(2001),(2069);
+INSERT INTO t4 (c4) SELECT c2 FROM t2;
+UPDATE t2 SET yy = c2;
+UPDATE t4 SET yyyy = c4;
+
+SELECT * FROM t2;
+SELECT * FROM t4;
+
+--echo # Comparison of YEAR(2) with YEAR(4)
+
+SELECT * FROM t2, t4 WHERE yy = yyyy;
+SELECT * FROM t2, t4 WHERE yy <=> yyyy;
+SELECT * FROM t2, t4 WHERE yy < yyyy;
+SELECT * FROM t2, t4 WHERE yy > yyyy;
+
+--echo # Comparison of YEAR(2) with YEAR(2)
+
+SELECT * FROM t2 a, t2 b WHERE a.yy = b.yy;
+SELECT * FROM t2 a, t2 b WHERE a.yy <=> b.yy;
+SELECT * FROM t2 a, t2 b WHERE a.yy < b.yy;
+
+--echo # Comparison of YEAR(4) with YEAR(4)
+
+SELECT * FROM t4 a, t4 b WHERE a.yyyy = b.yyyy;
+SELECT * FROM t4 a, t4 b WHERE a.yyyy <=> b.yyyy;
+SELECT * FROM t4 a, t4 b WHERE a.yyyy < b.yyyy;
+
+--echo # Comparison with constants:
+
+SELECT * FROM t2 WHERE yy = NULL;
+SELECT * FROM t4 WHERE yyyy = NULL;
+SELECT * FROM t2 WHERE yy <=> NULL;
+SELECT * FROM t4 WHERE yyyy <=> NULL;
+SELECT * FROM t2 WHERE yy < NULL;
+SELECT * FROM t2 WHERE yy > NULL;
+
+SELECT * FROM t2 WHERE yy = NOW();
+SELECT * FROM t4 WHERE yyyy = NOW();
+
+SELECT * FROM t2 WHERE yy = 99;
+SELECT * FROM t2 WHERE 99 = yy;
+SELECT * FROM t4 WHERE yyyy = 99;
+
+SELECT * FROM t2 WHERE yy = 'test';
+SELECT * FROM t4 WHERE yyyy = 'test';
+
+SELECT * FROM t2 WHERE yy = '1999';
+SELECT * FROM t4 WHERE yyyy = '1999';
+
+SELECT * FROM t2 WHERE yy = 1999;
+SELECT * FROM t4 WHERE yyyy = 1999;
+
+SELECT * FROM t2 WHERE yy = 1999.1;
+SELECT * FROM t4 WHERE yyyy = 1999.1;
+
+SELECT * FROM t2 WHERE yy = 1998.9;
+SELECT * FROM t4 WHERE yyyy = 1998.9;
+
+--echo # Coverage tests for YEAR with zero/2000 constants:
+
+SELECT * FROM t2 WHERE yy = 0;
+SELECT * FROM t2 WHERE yy = '0';
+SELECT * FROM t2 WHERE yy = '0000';
+SELECT * FROM t2 WHERE yy = '2000';
+SELECT * FROM t2 WHERE yy = 2000;
+
+SELECT * FROM t4 WHERE yyyy = 0;
+SELECT * FROM t4 WHERE yyyy = '0';
+SELECT * FROM t4 WHERE yyyy = '0000';
+SELECT * FROM t4 WHERE yyyy = '2000';
+SELECT * FROM t4 WHERE yyyy = 2000;
+
+--echo # Comparison with constants those are out of YEAR range
+--echo # (coverage test for backward compatibility)
+
+SELECT COUNT(yy) FROM t2;
+SELECT COUNT(yyyy) FROM t4;
+
+SELECT COUNT(*) FROM t2 WHERE yy = -1;
+SELECT COUNT(*) FROM t4 WHERE yyyy > -1;
+SELECT COUNT(*) FROM t2 WHERE yy > -1000000000000000000;
+SELECT COUNT(*) FROM t4 WHERE yyyy > -1000000000000000000;
+
+SELECT COUNT(*) FROM t2 WHERE yy < 2156;
+SELECT COUNT(*) FROM t4 WHERE yyyy < 2156;
+SELECT COUNT(*) FROM t2 WHERE yy < 1000000000000000000;
+SELECT COUNT(*) FROM t4 WHERE yyyy < 1000000000000000000;
+
+SELECT * FROM t2 WHERE yy < 123;
+SELECT * FROM t2 WHERE yy > 123;
+SELECT * FROM t4 WHERE yyyy < 123;
+SELECT * FROM t4 WHERE yyyy > 123;
+
+DROP TABLE t2, t4;
+
+--echo #
+
+--echo End of 5.1 tests
diff --git a/sql/item_cmpfunc.cc b/sql/item_cmpfunc.cc
index fd5eca8911a..e4f26978431 100644
--- a/sql/item_cmpfunc.cc
+++ b/sql/item_cmpfunc.cc
@@ -895,9 +895,9 @@ int Arg_comparator::set_cmp_func(Item_result_field *owner_arg,
   ulonglong const_value= (ulonglong)-1;
   thd= current_thd;
   owner= owner_arg;
+  set_null= set_null && owner_arg;
   a= a1;
   b= a2;
-  owner= owner_arg;
   thd= current_thd;
 
   if ((cmp_type= can_compare_as_dates(*a, *b, &const_value)))
@@ -956,40 +956,9 @@ int Arg_comparator::set_cmp_func(Item_result_field *owner_arg,
     if (agg_item_set_converter(coll, owner->func_name(),
                                b, 1, MY_COLL_CMP_CONV, 1))
       return 1;
-  } else if (type != ROW_RESULT && ((*a)->field_type() == MYSQL_TYPE_YEAR ||
-             (*b)->field_type() == MYSQL_TYPE_YEAR))
-  {
-    is_nulls_eq= is_owner_equal_func();
-    year_as_datetime= FALSE;
-
-    if ((*a)->is_datetime())
-    {
-      year_as_datetime= TRUE;
-      get_value_a_func= &get_datetime_value;
-    } else if ((*a)->field_type() == MYSQL_TYPE_YEAR)
-      get_value_a_func= &get_year_value;
-    else
-    {
-      /*
-        Because convert_constant_item is called only for EXECUTE in PS mode
-        the value of get_value_x_func set in PREPARE might be not
-        valid for EXECUTE.
-      */
-      get_value_a_func= NULL;
-    }
-
-    if ((*b)->is_datetime())
-    {
-      year_as_datetime= TRUE;
-      get_value_b_func= &get_datetime_value;
-    } else if ((*b)->field_type() == MYSQL_TYPE_YEAR)
-      get_value_b_func= &get_year_value;
-    else
-      get_value_b_func= NULL;
-
-    func= &Arg_comparator::compare_year;
-    return 0;
   }
+  else if (try_year_cmp_func(type))
+    return 0;
 
   a= cache_converted_constant(thd, a, &a_cache, type);
   b= cache_converted_constant(thd, b, &b_cache, type);
@@ -997,6 +966,45 @@ int Arg_comparator::set_cmp_func(Item_result_field *owner_arg,
 }
 
 
+/*
+  Helper function to call from Arg_comparator::set_cmp_func()
+*/
+
+bool Arg_comparator::try_year_cmp_func(Item_result type)
+{
+  if (type == ROW_RESULT)
+    return FALSE;
+
+  bool a_is_year= (*a)->field_type() == MYSQL_TYPE_YEAR;
+  bool b_is_year= (*b)->field_type() == MYSQL_TYPE_YEAR;
+
+  if (!a_is_year && !b_is_year)
+    return FALSE;
+
+  if (a_is_year && b_is_year)
+  {
+    get_value_a_func= &get_year_value;
+    get_value_b_func= &get_year_value;
+  }
+  else if (a_is_year && (*b)->is_datetime())
+  {
+    get_value_a_func= &get_year_value;
+    get_value_b_func= &get_datetime_value;
+  }
+  else if (b_is_year && (*a)->is_datetime())
+  {
+    get_value_b_func= &get_year_value;
+    get_value_a_func= &get_datetime_value;
+  }
+  else
+    return FALSE;
+
+  is_nulls_eq= is_owner_equal_func();
+  func= &Arg_comparator::compare_datetime;
+
+  return TRUE;
+}
+
 /**
   Convert and cache a constant.
 
@@ -1023,7 +1031,7 @@ Item** Arg_comparator::cache_converted_constant(THD *thd, Item **value,
       (*value)->const_item() && type != (*value)->result_type())
   {
     Item_cache *cache= Item_cache::get_cache(*value, type);
-    cache->store(*value);
+    cache->setup(*value);
     *cache_item= cache;
     return cache_item;
   }
@@ -1147,7 +1155,7 @@ get_datetime_value(THD *thd, Item ***item_arg, Item **cache_arg,
 
 
 /*
-  Retrieves YEAR value of 19XX form from given item.
+  Retrieves YEAR value of 19XX-00-00 00:00:00 form from given item.
 
   SYNOPSIS
     get_year_value()
@@ -1159,7 +1167,9 @@ get_datetime_value(THD *thd, Item ***item_arg, Item **cache_arg,
 
   DESCRIPTION
     Retrieves the YEAR value of 19XX form from given item for comparison by the
-    compare_year() function.
+    compare_datetime() function.
+    Converts year to DATETIME of form YYYY-00-00 00:00:00 for the compatibility
+    with the get_datetime_value function result.
 
   RETURN
     obtained value
@@ -1186,6 +1196,9 @@ get_year_value(THD *thd, Item ***item_arg, Item **cache_arg,
   if (value <= 1900)
     value+= 1900;
 
+  /* Convert year to DATETIME of form YYYY-00-00 00:00:00 (YYYY0000000000). */
+  value*= 10000000000LL;
+
   return value;
 }
 
@@ -1615,67 +1628,6 @@ int Arg_comparator::compare_e_row()
 }
 
 
-/**
-  Compare values as YEAR.
-
-  @details
-    Compare items as YEAR for EQUAL_FUNC and for other comparison functions.
-    The YEAR values of form 19XX are obtained with help of the get_year_value()
-    function.
-    If one of arguments is of DATE/DATETIME type its value is obtained
-    with help of the get_datetime_value function. In this case YEAR values
-    prior to comparison are converted to the ulonglong YYYY-00-00 00:00:00
-    DATETIME form.
-    If an argument type neither YEAR nor DATE/DATEIME then val_int function
-    is used to obtain value for comparison.
-
-  RETURN
-    If is_nulls_eq is TRUE:
-       1    if items are equal or both are null
-       0    otherwise
-    If is_nulls_eq is FALSE:
-      -1   a < b
-       0   a == b or at least one of items is null
-       1   a > b
-    See the table:
-    is_nulls_eq | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 |
-    a_is_null   | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 |
-    b_is_null   | 1 | 1 | 0 | 0 | 1 | 1 | 0 | 0 |
-    result      | 1 | 0 | 0 |0/1| 0 | 0 | 0 |-1/0/1|
-*/
-
-int Arg_comparator::compare_year()
-{
-  bool a_is_null, b_is_null;
-  ulonglong val1= get_value_a_func ?
-                    (*get_value_a_func)(thd, &a, &a_cache, *b, &a_is_null) :
-                    (*a)->val_int();
-  ulonglong val2= get_value_b_func ?
-                    (*get_value_b_func)(thd, &b, &b_cache, *a, &b_is_null) :
-                    (*b)->val_int();
-  if (!(*a)->null_value)
-  {
-    if (!(*b)->null_value)
-    {
-      if (set_null)
-        owner->null_value= 0;
-      /* Convert year to DATETIME of form YYYY-00-00 00:00:00 when necessary. */
-      if((*a)->field_type() == MYSQL_TYPE_YEAR && year_as_datetime)
-        val1*= 10000000000LL;
-      if((*b)->field_type() == MYSQL_TYPE_YEAR && year_as_datetime)
-        val2*= 10000000000LL;
-
-      if (val1 < val2)	return is_nulls_eq ? 0 : -1;
-      if (val1 == val2)   return is_nulls_eq ? 1 : 0;
-      return is_nulls_eq ? 0 : 1;
-    }
-  }
-  if (set_null)
-    owner->null_value= is_nulls_eq ? 0 : 1;
-  return (is_nulls_eq && (*a)->null_value == (*b)->null_value) ? 1 : 0;
-}
-
-
 void Item_func_truth::fix_length_and_dec()
 {
   maybe_null= 0;
diff --git a/sql/item_cmpfunc.h b/sql/item_cmpfunc.h
index 52af6a31c0c..05c9fc96ff5 100644
--- a/sql/item_cmpfunc.h
+++ b/sql/item_cmpfunc.h
@@ -42,24 +42,22 @@ class Arg_comparator: public Sql_alloc
   bool is_nulls_eq;                // TRUE <=> compare for the EQUAL_FUNC
   bool set_null;                   // TRUE <=> set owner->null_value
                                    //   when one of arguments is NULL.
-  bool year_as_datetime;           // TRUE <=> convert YEAR value to
-                                   // the YYYY-00-00 00:00:00 DATETIME
-                                   // format. See compare_year.
   enum enum_date_cmp_type { CMP_DATE_DFLT= 0, CMP_DATE_WITH_DATE,
                             CMP_DATE_WITH_STR, CMP_STR_WITH_DATE };
   longlong (*get_value_a_func)(THD *thd, Item ***item_arg, Item **cache_arg,
                                Item *warn_item, bool *is_null);
   longlong (*get_value_b_func)(THD *thd, Item ***item_arg, Item **cache_arg,
                                Item *warn_item, bool *is_null);
+  bool try_year_cmp_func(Item_result type);
 public:
   DTCollation cmp_collation;
   /* Allow owner function to use string buffers. */
   String value1, value2;
 
-  Arg_comparator(): thd(0), a_cache(0), b_cache(0), set_null(0),
-    year_as_datetime(0), get_value_a_func(0), get_value_b_func(0) {};
+  Arg_comparator(): thd(0), a_cache(0), b_cache(0), set_null(TRUE),
+    get_value_a_func(0), get_value_b_func(0) {};
   Arg_comparator(Item **a1, Item **a2): a(a1), b(a2), thd(0),
-    a_cache(0), b_cache(0), set_null(0), year_as_datetime(0),
+    a_cache(0), b_cache(0), set_null(TRUE),
     get_value_a_func(0), get_value_b_func(0) {};
 
   int set_compare_func(Item_result_field *owner, Item_result type);
@@ -101,7 +99,6 @@ public:
   int compare_real_fixed();
   int compare_e_real_fixed();
   int compare_datetime();        // compare args[0] & args[1] as DATETIMEs
-  int compare_year();
 
   static enum enum_date_cmp_type can_compare_as_dates(Item *a, Item *b,
                                                       ulonglong *const_val_arg);
diff --git a/sql/sql_show.cc b/sql/sql_show.cc
index 2c1f360104b..e55000c0f65 100644
--- a/sql/sql_show.cc
+++ b/sql/sql_show.cc
@@ -719,7 +719,7 @@ mysqld_show_create(THD *thd, TABLE_LIST *table_list)
     thd->push_internal_handler(&view_error_suppressor);
     bool error= open_normal_and_derived_tables(thd, table_list, 0);
     thd->pop_internal_handler();
-    if (error && thd->main_da.is_error())
+    if (error && (thd->killed || thd->main_da.is_error()))
       DBUG_RETURN(TRUE);
   }