diff --git a/client/mysql_upgrade.c b/client/mysql_upgrade.c
index 1646f2baf51..02829cd2178 100644
--- a/client/mysql_upgrade.c
+++ b/client/mysql_upgrade.c
@@ -456,7 +456,11 @@ static int run_query(const char *query, DYNAMIC_STRING *ds_res,
 
   if (my_write(fd, query, strlen(query),
                MYF(MY_FNABP | MY_WME)))
+  {
+    my_close(fd, MYF(0));
+    my_delete(query_file_path, MYF(0));
     die("Failed to write to '%s'", query_file_path);
+  }
 
   ret= run_tool(mysql_path,
                 ds_res,
diff --git a/client/mysqltest.c b/client/mysqltest.c
index a2412d4b30e..eae3b05f61a 100644
--- a/client/mysqltest.c
+++ b/client/mysqltest.c
@@ -1580,10 +1580,21 @@ void check_result(DYNAMIC_STRING* ds)
       and then show the diff
     */
     char reject_file[FN_REFLEN];
-    str_to_file(fn_format(reject_file, result_file_name, opt_logdir, ".reject",
-                          *opt_logdir ? MY_REPLACE_DIR | MY_REPLACE_EXT :
-                          MY_REPLACE_EXT),
-                ds->str, ds->length);
+    dirname_part(reject_file, result_file_name);
+
+    if (access(reject_file, W_OK) == 0)
+    {
+      /* Result file directory is writable, save reject file there */
+      fn_format(reject_file, result_file_name, NULL,
+                ".reject", MY_REPLACE_EXT);
+    }
+    else
+    {
+      /* Put reject file in opt_logdir */
+      fn_format(reject_file, result_file_name, opt_logdir,
+                ".reject", MY_REPLACE_DIR | MY_REPLACE_EXT);
+    }
+    str_to_file(reject_file, ds->str, ds->length);
 
     dynstr_set(ds, NULL); /* Don't create a .log file */
 
diff --git a/extra/comp_err.c b/extra/comp_err.c
index 7cc4a0aa43f..79f591e45fb 100644
--- a/extra/comp_err.c
+++ b/extra/comp_err.c
@@ -167,6 +167,7 @@ int main(int argc, char *argv[])
     DBUG_ENTER("main");
 
     charsets_dir= DEFAULT_CHARSET_DIR;
+    my_umask_dir= 0777;
     if (get_options(&argc, &argv))
       DBUG_RETURN(1);
     if (!(row_count= parse_input_file(TXTFILE, &error_head, &lang_head)))
diff --git a/mysql-test/lib/mtr_cases.pl b/mysql-test/lib/mtr_cases.pl
index 5e176dce109..5aabb7f8863 100644
--- a/mysql-test/lib/mtr_cases.pl
+++ b/mysql-test/lib/mtr_cases.pl
@@ -27,6 +27,26 @@ sub collect_one_test_case ($$$$$$$);
 
 sub mtr_options_from_test_file($$);
 
+my $do_test;
+my $skip_test;
+
+sub init_pattern {
+  my ($from, $what)= @_;
+  if ( $from =~ /[a-z0-9]/ ) {
+    # Does not contain any regex, make the pattern match
+    # beginning of string
+    $from= "^$from";
+  }
+  else {
+    # Check that pattern is a valid regex
+    eval { "" =~/$from/; 1 } or
+      mtr_error("Invalid regex '$from' passed to $what\nPerl says: $@");
+  }
+  return $from;
+}
+
+
+
 ##############################################################################
 #
 #  Collect information about test cases we are to run
@@ -39,6 +59,9 @@ sub collect_test_cases ($) {
   my $testdir;
   my $resdir;
 
+  $do_test= init_pattern($::opt_do_test, "--do-test");
+  $skip_test= init_pattern($::opt_skip_test, "--skip-test");
+
   if ( $suite eq "main" )
   {
     $testdir= "$::glob_mysql_test_dir/t";
@@ -162,8 +185,7 @@ sub collect_test_cases ($) {
       }
 
       # Skip tests that does not match the --do-test= filter
-      next if $::opt_do_test and
-	! defined mtr_match_prefix($elem,$::opt_do_test);
+      next if ($do_test and not $tname =~ /$do_test/o);
 
       collect_one_test_case($testdir,$resdir,$tname,$elem,$cases,\%disabled,
         $component_id);
@@ -288,7 +310,7 @@ sub collect_one_test_case($$$$$$$) {
   # Skip some tests but include in list, just mark them to skip
   # ----------------------------------------------------------------------
 
-  if ( $::opt_skip_test and defined mtr_match_prefix($tname,$::opt_skip_test) )
+  if ( $skip_test and $tname =~ /$skip_test/o )
   {
     $tinfo->{'skip'}= 1;
     return;
diff --git a/mysql-test/mysql-test-run.pl b/mysql-test/mysql-test-run.pl
index ad507440bb7..29d3265a462 100755
--- a/mysql-test/mysql-test-run.pl
+++ b/mysql-test/mysql-test-run.pl
@@ -1334,12 +1334,13 @@ sub datadir_list_setup () {
 
 sub collect_mysqld_features () {
   my $found_variable_list_start= 0;
+  my $tmpdir= tempdir(CLEANUP => 0); # Directory removed by this function
 
   #
   # Execute "mysqld --no-defaults --help --verbose" to get a
   # list of all features and settings
   #
-  my $list= `$exe_mysqld --no-defaults --verbose --help`;
+  my $list= `$exe_mysqld --no-defaults --datadir=$tmpdir --verbose --help`;
 
   foreach my $line (split('\n', $list))
   {
@@ -1394,7 +1395,7 @@ sub collect_mysqld_features () {
       }
     }
   }
-
+  rmtree($tmpdir);
   mtr_error("Could not find version of MySQL") unless $mysql_version_id;
   mtr_error("Could not find variabes list") unless $found_variable_list_start;
 
@@ -5006,7 +5007,7 @@ sub valgrind_arguments {
   }
 
   # Add valgrind options, can be overriden by user
-  mtr_add_arg($args, '%s', $_) for (split(' ', $opt_valgrind_options));
+  mtr_add_arg($args, '%s', $opt_valgrind_options);
 
   mtr_add_arg($args, $$exe);
 
@@ -5079,12 +5080,16 @@ Options to control what test suites or cases to run
   skip-ndb[cluster]     Skip all tests that need cluster
   skip-ndb[cluster]-slave Skip all tests that need a slave cluster
   ndb-extra             Run extra tests from ndb directory
-  do-test=PREFIX        Run test cases which name are prefixed with PREFIX
+  do-test=PREFIX or REGEX
+                        Run test cases which name are prefixed with PREFIX
+                        or fulfills REGEX
+  skip-test=PREFIX or REGEX
+                        Skip test cases which name are prefixed with PREFIX
+                        or fulfills REGEX
   start-from=PREFIX     Run test cases starting from test prefixed with PREFIX
   suite=NAME            Run the test suite named NAME. The default is "main"
   skip-rpl              Skip the replication test cases.
   skip-im               Don't start IM, and skip the IM test cases
-  skip-test=PREFIX      Skip test cases which name are prefixed with PREFIX
   big-test              Set the environment variable BIG_TEST, which can be
                         checked from test cases.
 
diff --git a/mysql-test/r/grant.result b/mysql-test/r/grant.result
index a4c51cca277..855352a2195 100644
--- a/mysql-test/r/grant.result
+++ b/mysql-test/r/grant.result
@@ -1121,6 +1121,9 @@ SELECT * FROM test.t1;
 f1	f2
 1	1
 2	2
+REVOKE UPDATE (f1) ON `test`.`t1` FROM 'mysqltest_1'@'localhost';
+REVOKE SELECT ON `test`.* FROM 'mysqltest_1'@'localhost';
+REVOKE ALL ON db27878.* FROM 'mysqltest_1'@'localhost';
 DROP DATABASE db27878;
 use test;
 DROP TABLE t1;
diff --git a/mysql-test/r/grant3.result b/mysql-test/r/grant3.result
index 6193c4fd49d..cc7f46855b2 100644
--- a/mysql-test/r/grant3.result
+++ b/mysql-test/r/grant3.result
@@ -16,3 +16,125 @@ delete from mysql.db where user like 'mysqltest\_%';
 delete from mysql.tables_priv where user like 'mysqltest\_%';
 delete from mysql.columns_priv where user like 'mysqltest\_%';
 flush privileges;
+grant select on test.* to CUser@localhost;
+grant select on test.* to CUser@LOCALHOST;
+flush privileges;
+SELECT user, host FROM mysql.user where user = 'CUser' order by 1,2;
+user	host
+CUser	LOCALHOST
+CUser	localhost
+SELECT user, host, db, select_priv FROM mysql.db where user = 'CUser' order by 1,2;
+user	host	db	select_priv
+CUser	LOCALHOST	test	Y
+CUser	localhost	test	Y
+REVOKE ALL PRIVILEGES, GRANT OPTION FROM 'CUser'@'LOCALHOST';
+flush privileges;
+SELECT user, host FROM mysql.user where user = 'CUser' order by 1,2;
+user	host
+CUser	LOCALHOST
+CUser	localhost
+SELECT user, host, db, select_priv FROM mysql.db where user = 'CUser' order by 1,2;
+user	host	db	select_priv
+CUser	localhost	test	Y
+REVOKE ALL PRIVILEGES, GRANT OPTION FROM 'CUser'@'localhost';
+flush privileges;
+SELECT user, host FROM mysql.user where user = 'CUser' order by 1,2;
+user	host
+CUser	LOCALHOST
+CUser	localhost
+SELECT user, host, db, select_priv FROM mysql.db where user = 'CUser' order by 1,2;
+user	host	db	select_priv
+DROP USER CUser@localhost;
+DROP USER CUser@LOCALHOST;
+create table t1 (a int);
+grant select on test.t1 to CUser@localhost;
+grant select on test.t1 to CUser@LOCALHOST;
+flush privileges;
+SELECT user, host FROM mysql.user where user = 'CUser' order by 1,2;
+user	host
+CUser	LOCALHOST
+CUser	localhost
+SELECT user, host, db, Table_name, Table_priv, Column_priv FROM mysql.tables_priv where user = 'CUser' order by 1,2;
+user	host	db	Table_name	Table_priv	Column_priv
+CUser	LOCALHOST	test	t1	Select	
+CUser	localhost	test	t1	Select	
+REVOKE ALL PRIVILEGES, GRANT OPTION FROM 'CUser'@'LOCALHOST';
+flush privileges;
+SELECT user, host FROM mysql.user where user = 'CUser' order by 1,2;
+user	host
+CUser	LOCALHOST
+CUser	localhost
+SELECT user, host, db, Table_name, Table_priv, Column_priv FROM mysql.tables_priv where user = 'CUser' order by 1,2;
+user	host	db	Table_name	Table_priv	Column_priv
+CUser	localhost	test	t1	Select	
+REVOKE ALL PRIVILEGES, GRANT OPTION FROM 'CUser'@'localhost';
+flush privileges;
+SELECT user, host FROM mysql.user where user = 'CUser' order by 1,2;
+user	host
+CUser	LOCALHOST
+CUser	localhost
+SELECT user, host, db, Table_name, Table_priv, Column_priv FROM mysql.tables_priv where user = 'CUser' order by 1,2;
+user	host	db	Table_name	Table_priv	Column_priv
+DROP USER CUser@localhost;
+DROP USER CUser@LOCALHOST;
+grant select(a) on test.t1 to CUser@localhost;
+grant select(a) on test.t1 to CUser@LOCALHOST;
+flush privileges;
+SELECT user, host FROM mysql.user where user = 'CUser' order by 1,2;
+user	host
+CUser	LOCALHOST
+CUser	localhost
+SELECT user, host, db, Table_name, Table_priv, Column_priv FROM mysql.tables_priv where user = 'CUser' order by 1,2;
+user	host	db	Table_name	Table_priv	Column_priv
+CUser	LOCALHOST	test	t1		Select
+CUser	localhost	test	t1		Select
+REVOKE ALL PRIVILEGES, GRANT OPTION FROM 'CUser'@'LOCALHOST';
+flush privileges;
+SELECT user, host FROM mysql.user where user = 'CUser' order by 1,2;
+user	host
+CUser	LOCALHOST
+CUser	localhost
+SELECT user, host, db, Table_name, Table_priv, Column_priv FROM mysql.tables_priv where user = 'CUser' order by 1,2;
+user	host	db	Table_name	Table_priv	Column_priv
+CUser	localhost	test	t1		Select
+REVOKE ALL PRIVILEGES, GRANT OPTION FROM 'CUser'@'localhost';
+flush privileges;
+SELECT user, host FROM mysql.user where user = 'CUser' order by 1,2;
+user	host
+CUser	LOCALHOST
+CUser	localhost
+SELECT user, host, db, Table_name, Table_priv, Column_priv FROM mysql.tables_priv where user = 'CUser' order by 1,2;
+user	host	db	Table_name	Table_priv	Column_priv
+DROP USER CUser@localhost;
+DROP USER CUser@LOCALHOST;
+drop table t1;
+grant select on test.* to CUser2@localhost;
+grant select on test.* to CUser2@LOCALHOST;
+flush privileges;
+SELECT user, host FROM mysql.user where user = 'CUser2' order by 1,2;
+user	host
+CUser2	LOCALHOST
+CUser2	localhost
+SELECT user, host, db, select_priv FROM mysql.db where user = 'CUser2' order by 1,2;
+user	host	db	select_priv
+CUser2	LOCALHOST	test	Y
+CUser2	localhost	test	Y
+REVOKE SELECT ON test.* FROM 'CUser2'@'LOCALHOST';
+flush privileges;
+SELECT user, host FROM mysql.user where user = 'CUser2' order by 1,2;
+user	host
+CUser2	LOCALHOST
+CUser2	localhost
+SELECT user, host, db, select_priv FROM mysql.db where user = 'CUser2' order by 1,2;
+user	host	db	select_priv
+CUser2	localhost	test	Y
+REVOKE SELECT ON test.* FROM 'CUser2'@'localhost';
+flush privileges;
+SELECT user, host FROM mysql.user where user = 'CUser2' order by 1,2;
+user	host
+CUser2	LOCALHOST
+CUser2	localhost
+SELECT user, host, db, select_priv FROM mysql.db where user = 'CUser2' order by 1,2;
+user	host	db	select_priv
+DROP USER CUser2@localhost;
+DROP USER CUser2@LOCALHOST;
diff --git a/mysql-test/r/type_datetime.result b/mysql-test/r/type_datetime.result
index 9e47b5da2b6..5929a315e8d 100644
--- a/mysql-test/r/type_datetime.result
+++ b/mysql-test/r/type_datetime.result
@@ -427,3 +427,26 @@ f1
 Warnings:
 Warning	1292	Incorrect datetime value: '2007010100000' for column 'f1' at row 1
 drop table t1;
+create table t1 (f1 time);
+insert into t1 set f1 = '45:44:44';
+insert into t1 set f1 = '15:44:44';
+select * from t1 where (convert(f1,datetime)) != 1;
+f1
+15:44:44
+Warnings:
+Warning	1292	Truncated incorrect datetime value: '0000-00-00 45:44:44'
+drop table t1;
+create table t1 (a tinyint);
+insert into t1 values (), (), ();
+select sum(a) from t1 group by convert(a, datetime);
+sum(a)
+NULL
+select convert(a, datetime) from t1;
+Catalog	Database	Table	Table_alias	Column	Column_alias	Type	Length	Max length	Is_null	Flags	Decimals	Charsetnr
+def					convert(a, datetime)	12	29	0	Y	128	6	63
+convert(a, datetime)
+NULL
+NULL
+NULL
+drop table t1;
+End of 5.0 tests
diff --git a/mysql-test/t/grant.test b/mysql-test/t/grant.test
index 32eb262fd51..1d11a669811 100644
--- a/mysql-test/t/grant.test
+++ b/mysql-test/t/grant.test
@@ -1144,6 +1144,9 @@ UPDATE v1 SET f2 = 4;
 SELECT * FROM test.t1;
 disconnect user1;
 connection default;
+REVOKE UPDATE (f1) ON `test`.`t1` FROM 'mysqltest_1'@'localhost';
+REVOKE SELECT ON `test`.* FROM 'mysqltest_1'@'localhost';
+REVOKE ALL ON db27878.* FROM 'mysqltest_1'@'localhost';
 DROP DATABASE db27878;
 use test;
 DROP TABLE t1;
diff --git a/mysql-test/t/grant3.test b/mysql-test/t/grant3.test
index 115586e807d..fac577ef0ff 100644
--- a/mysql-test/t/grant3.test
+++ b/mysql-test/t/grant3.test
@@ -34,3 +34,103 @@ delete from mysql.db where user like 'mysqltest\_%';
 delete from mysql.tables_priv where user like 'mysqltest\_%';
 delete from mysql.columns_priv where user like 'mysqltest\_%';
 flush privileges;
+
+#
+# Bug: #19828 Case sensitivity in Grant/Revoke
+#
+
+grant select on test.* to CUser@localhost;
+grant select on test.* to CUser@LOCALHOST;
+flush privileges;
+
+SELECT user, host FROM mysql.user where user = 'CUser' order by 1,2;
+SELECT user, host, db, select_priv FROM mysql.db where user = 'CUser' order by 1,2;
+
+REVOKE ALL PRIVILEGES, GRANT OPTION FROM 'CUser'@'LOCALHOST';
+flush privileges;
+
+SELECT user, host FROM mysql.user where user = 'CUser' order by 1,2;
+SELECT user, host, db, select_priv FROM mysql.db where user = 'CUser' order by 1,2;
+
+REVOKE ALL PRIVILEGES, GRANT OPTION FROM 'CUser'@'localhost';
+flush privileges;
+
+SELECT user, host FROM mysql.user where user = 'CUser' order by 1,2;
+SELECT user, host, db, select_priv FROM mysql.db where user = 'CUser' order by 1,2;
+
+DROP USER CUser@localhost;
+DROP USER CUser@LOCALHOST;
+
+#### table grants
+create table t1 (a int);
+grant select on test.t1 to CUser@localhost;
+grant select on test.t1 to CUser@LOCALHOST;
+flush privileges;
+
+SELECT user, host FROM mysql.user where user = 'CUser' order by 1,2;
+SELECT user, host, db, Table_name, Table_priv, Column_priv FROM mysql.tables_priv where user = 'CUser' order by 1,2;
+
+REVOKE ALL PRIVILEGES, GRANT OPTION FROM 'CUser'@'LOCALHOST';
+flush privileges;
+
+SELECT user, host FROM mysql.user where user = 'CUser' order by 1,2;
+SELECT user, host, db, Table_name, Table_priv, Column_priv FROM mysql.tables_priv where user = 'CUser' order by 1,2;
+
+REVOKE ALL PRIVILEGES, GRANT OPTION FROM 'CUser'@'localhost';
+flush privileges;
+
+SELECT user, host FROM mysql.user where user = 'CUser' order by 1,2;
+SELECT user, host, db, Table_name, Table_priv, Column_priv FROM mysql.tables_priv where user = 'CUser' order by 1,2;
+
+DROP USER CUser@localhost;
+DROP USER CUser@LOCALHOST;
+
+### column grants
+
+grant select(a) on test.t1 to CUser@localhost;
+grant select(a) on test.t1 to CUser@LOCALHOST;
+flush privileges;
+
+SELECT user, host FROM mysql.user where user = 'CUser' order by 1,2;
+SELECT user, host, db, Table_name, Table_priv, Column_priv FROM mysql.tables_priv where user = 'CUser' order by 1,2;
+
+REVOKE ALL PRIVILEGES, GRANT OPTION FROM 'CUser'@'LOCALHOST';
+flush privileges;
+
+SELECT user, host FROM mysql.user where user = 'CUser' order by 1,2;
+SELECT user, host, db, Table_name, Table_priv, Column_priv FROM mysql.tables_priv where user = 'CUser' order by 1,2;
+
+REVOKE ALL PRIVILEGES, GRANT OPTION FROM 'CUser'@'localhost';
+flush privileges;
+
+SELECT user, host FROM mysql.user where user = 'CUser' order by 1,2;
+SELECT user, host, db, Table_name, Table_priv, Column_priv FROM mysql.tables_priv where user = 'CUser' order by 1,2;
+
+DROP USER CUser@localhost;
+DROP USER CUser@LOCALHOST;
+
+drop table t1;
+
+# revoke on a specific DB only
+
+grant select on test.* to CUser2@localhost;
+grant select on test.* to CUser2@LOCALHOST;
+flush privileges;
+
+SELECT user, host FROM mysql.user where user = 'CUser2' order by 1,2;
+SELECT user, host, db, select_priv FROM mysql.db where user = 'CUser2' order by 1,2;
+
+REVOKE SELECT ON test.* FROM 'CUser2'@'LOCALHOST';
+flush privileges;
+
+SELECT user, host FROM mysql.user where user = 'CUser2' order by 1,2;
+SELECT user, host, db, select_priv FROM mysql.db where user = 'CUser2' order by 1,2;
+
+REVOKE SELECT ON test.* FROM 'CUser2'@'localhost';
+flush privileges;
+
+SELECT user, host FROM mysql.user where user = 'CUser2' order by 1,2;
+SELECT user, host, db, select_priv FROM mysql.db where user = 'CUser2' order by 1,2;
+
+DROP USER CUser2@localhost;
+DROP USER CUser2@LOCALHOST;
diff --git a/mysql-test/t/mysqltest.test b/mysql-test/t/mysqltest.test
index 8a38972c00f..ec188af0244 100644
--- a/mysql-test/t/mysqltest.test
+++ b/mysql-test/t/mysqltest.test
@@ -1435,7 +1435,10 @@ select "this will be executed";
 --exec $MYSQL_TEST -x $MYSQLTEST_VARDIR/tmp/query.sql -R $MYSQLTEST_VARDIR/tmp/zero_length_file.result  > /dev/null 2>&1
 
 remove_file $MYSQLTEST_VARDIR/tmp/zero_length_file.result;
+--error 0,1
 remove_file $MYSQLTEST_VARDIR/log/zero_length_file.reject;
+--error 0,1
+remove_file $MYSQL_TEST_DIR/r/zero_length_file.reject;
 
 #
 # Test that a test file that does not generate any output fails.
diff --git a/mysql-test/t/type_datetime.test b/mysql-test/t/type_datetime.test
index ffda593f320..b909b4894a3 100644
--- a/mysql-test/t/type_datetime.test
+++ b/mysql-test/t/type_datetime.test
@@ -282,3 +282,26 @@ select * from t1 where f1 between 20020101 and 20070101000000;
 select * from t1 where f1 between 2002010 and 20070101000000;
 select * from t1 where f1 between 20020101 and 2007010100000;
 drop table t1;
+
+#
+# Bug #31253: crash comparing datetime to double
+# Should return 1st row only. Crashes if NULL propagation fails.
+#
+create table t1 (f1 time);
+insert into t1 set f1 = '45:44:44';
+insert into t1 set f1 = '15:44:44';
+select * from t1 where (convert(f1,datetime)) != 1;
+drop table t1;
+
+#
+# Bug #31249: problem with convert(..., datetime)
+#
+create table t1 (a tinyint);
+insert into t1 values (), (), ();
+select sum(a) from t1 group by convert(a, datetime);
+--enable_metadata
+select convert(a, datetime) from t1;
+--disable_metadata
+drop table t1;
+
+--echo End of 5.0 tests
diff --git a/sql/item.cc b/sql/item.cc
index e9b2904e3da..5f73b016e50 100644
--- a/sql/item.cc
+++ b/sql/item.cc
@@ -274,6 +274,7 @@ my_decimal *Item::val_decimal_from_date(my_decimal *decimal_value)
   if (get_date(&ltime, TIME_FUZZY_DATE))
   {
     my_decimal_set_zero(decimal_value);
+    null_value= 1;                               // set NULL, stop processing
     return 0;
   }
   return date2my_decimal(&ltime, decimal_value);
diff --git a/sql/item_timefunc.h b/sql/item_timefunc.h
index 8e925a0156f..94bee28bb6b 100644
--- a/sql/item_timefunc.h
+++ b/sql/item_timefunc.h
@@ -844,7 +844,9 @@ public:
   enum_field_types field_type() const { return MYSQL_TYPE_DATETIME; }
   void fix_length_and_dec()
   {
-    Item_typecast_maybe_null::fix_length_and_dec();
+    collation.set(&my_charset_bin);
+    maybe_null= 1;
+    max_length= MAX_DATETIME_FULL_WIDTH * MY_CHARSET_BIN_MB_MAXLEN;
     decimals= DATETIME_DEC;
   }
 
diff --git a/sql/sql_acl.cc b/sql/sql_acl.cc
index f9bd2c6ba0d..6bc6cce5e72 100644
--- a/sql/sql_acl.cc
+++ b/sql/sql_acl.cc
@@ -1132,7 +1132,7 @@ static void acl_update_db(const char *user, const char *host, const char *db,
     {
       if (!acl_db->host.hostname && !host[0] ||
 	  acl_db->host.hostname &&
-	  !my_strcasecmp(system_charset_info, host, acl_db->host.hostname))
+          !strcmp(host, acl_db->host.hostname))
       {
 	if (!acl_db->db && !db[0] ||
 	    acl_db->db && !strcmp(db,acl_db->db))
@@ -4344,6 +4344,13 @@ bool mysql_show_grants(THD *thd,LEX_USER *lex_user)
     if (!(host=acl_db->host.hostname))
       host= "";
 
+    /*
+      We do not make SHOW GRANTS case-sensitive here (like REVOKE),
+      but make it case-insensitive because that's the way they are
+      actually applied, and showing fewer privileges than are applied
+      would be wrong from a security point of view.
+    */
+
     if (!strcmp(lex_user->user.str,user) &&
 	!my_strcasecmp(system_charset_info, lex_user->host.str, host))
     {
@@ -4379,8 +4386,8 @@ bool mysql_show_grants(THD *thd,LEX_USER *lex_user)
 	db.append(lex_user->user.str, lex_user->user.length,
 		  system_charset_info);
 	db.append (STRING_WITH_LEN("'@'"));
-	db.append(lex_user->host.str, lex_user->host.length,
-                  system_charset_info);
+	// host and lex_user->host are equal except for case
+	db.append(host, strlen(host), system_charset_info);
 	db.append ('\'');
 	if (want_access & GRANT_ACL)
 	  db.append(STRING_WITH_LEN(" WITH GRANT OPTION"));
@@ -4407,6 +4414,13 @@ bool mysql_show_grants(THD *thd,LEX_USER *lex_user)
     if (!(host= grant_table->host.hostname))
       host= "";
 
+    /*
+      We do not make SHOW GRANTS case-sensitive here (like REVOKE),
+      but make it case-insensitive because that's the way they are
+      actually applied, and showing fewer privileges than are applied
+      would be wrong from a security point of view.
+    */
+
     if (!strcmp(lex_user->user.str,user) &&
 	!my_strcasecmp(system_charset_info, lex_user->host.str, host))
     {
@@ -4487,8 +4501,8 @@ bool mysql_show_grants(THD *thd,LEX_USER *lex_user)
 	global.append(lex_user->user.str, lex_user->user.length,
 		      system_charset_info);
 	global.append(STRING_WITH_LEN("'@'"));
-	global.append(lex_user->host.str,lex_user->host.length,
-		      system_charset_info);
+	// host and lex_user->host are equal except for case
+	global.append(host, strlen(host), system_charset_info);
 	global.append('\'');
 	if (table_access & GRANT_ACL)
 	  global.append(STRING_WITH_LEN(" WITH GRANT OPTION"));
@@ -4543,6 +4557,13 @@ static int show_routine_grants(THD* thd, LEX_USER *lex_user, HASH *hash,
     if (!(host= grant_proc->host.hostname))
       host= "";
 
+    /*
+      We do not make SHOW GRANTS case-sensitive here (like REVOKE),
+      but make it case-insensitive because that's the way they are
+      actually applied, and showing fewer privileges than are applied
+      would be wrong from a security point of view.
+    */
+
     if (!strcmp(lex_user->user.str,user) &&
 	!my_strcasecmp(system_charset_info, lex_user->host.str, host))
     {
@@ -4586,8 +4607,8 @@ static int show_routine_grants(THD* thd, LEX_USER *lex_user, HASH *hash,
 	global.append(lex_user->user.str, lex_user->user.length,
 		      system_charset_info);
 	global.append(STRING_WITH_LEN("'@'"));
-	global.append(lex_user->host.str,lex_user->host.length,
-		      system_charset_info);
+	// host and lex_user->host are equal except for case
+	global.append(host, strlen(host), system_charset_info);
 	global.append('\'');
 	if (proc_access & GRANT_ACL)
 	  global.append(STRING_WITH_LEN(" WITH GRANT OPTION"));
@@ -5541,7 +5562,7 @@ bool mysql_revoke_all(THD *thd,  List <LEX_USER> &list)
 	  host= "";
 
 	if (!strcmp(lex_user->user.str,user) &&
-	    !my_strcasecmp(system_charset_info, lex_user->host.str, host))
+            !strcmp(lex_user->host.str, host))
 	{
 	  if (!replace_db_table(tables[1].table, acl_db->db, *lex_user, ~(ulong)0, 1))
 	  {
@@ -5572,7 +5593,7 @@ bool mysql_revoke_all(THD *thd,  List <LEX_USER> &list)
 	  host= "";
 
 	if (!strcmp(lex_user->user.str,user) &&
-	    !my_strcasecmp(system_charset_info, lex_user->host.str, host))
+            !strcmp(lex_user->host.str, host))
 	{
 	  if (replace_table_table(thd,grant_table,tables[2].table,*lex_user,
 				  grant_table->db,
@@ -5618,7 +5639,7 @@ bool mysql_revoke_all(THD *thd,  List <LEX_USER> &list)
 	  host= "";
 
 	if (!strcmp(lex_user->user.str,user) &&
-	    !my_strcasecmp(system_charset_info, lex_user->host.str, host))
+            !strcmp(lex_user->host.str, host))
 	{
 	  if (!replace_routine_table(thd,grant_proc,tables[4].table,*lex_user,
 				  grant_proc->db,
diff --git a/sql/sql_select.cc b/sql/sql_select.cc
index 1d11f23d854..7d4421b2749 100644
--- a/sql/sql_select.cc
+++ b/sql/sql_select.cc
@@ -13902,13 +13902,31 @@ calc_group_buffer(JOIN *join,ORDER *group)
                                                 group_item->decimals);
         break;
       case STRING_RESULT:
+      {
+        enum enum_field_types type= group_item->field_type();
         /*
-          Group strings are taken as varstrings and require an length field.
-          A field is not yet created by create_tmp_field()
-          and the sizes should match up.
+          As items represented as DATE/TIME fields in the group buffer
+          have STRING_RESULT result type, we increase the length 
+          by 8 as maximum pack length of such fields.
         */
-        key_length+= group_item->max_length + HA_KEY_BLOB_LENGTH;
+        if (type == MYSQL_TYPE_TIME ||
+            type == MYSQL_TYPE_DATE ||
+            type == MYSQL_TYPE_DATETIME ||
+            type == MYSQL_TYPE_TIMESTAMP)
+        {
+          key_length+= 8;
+        }
+        else
+        {
+          /*
+            Group strings are taken as varstrings and require an length field.
+            A field is not yet created by create_tmp_field()
+            and the sizes should match up.
+          */
+          key_length+= group_item->max_length + HA_KEY_BLOB_LENGTH;
+        }
         break;
+      }
       default:
         /* This case should never be choosen */
         DBUG_ASSERT(0);