diff --git a/myisam/mi_search.c b/myisam/mi_search.c
index ed61bbfe41a..b7360dba7f3 100644
--- a/myisam/mi_search.c
+++ b/myisam/mi_search.c
@@ -318,19 +318,21 @@ int _mi_prefix_search(MI_INFO *info, register MI_KEYDEF *keyinfo, uchar *page,
   get_key_pack_length(kseg_len,length_pack,kseg);
   key_len_skip=length_pack+kseg_len;
   key_len_left=(int) key_len- (int) key_len_skip;
+  /* If key_len is 0, then lenght_pack is 1, then key_len_left is -1. */
   cmplen=(key_len_left>=0) ? kseg_len : key_len-length_pack;
   DBUG_PRINT("info",("key: '%.*s'",kseg_len,kseg));
 
   /*
     Keys are compressed the following way:
 
-    If the max length of first key segment <= 127 characters the prefix is
+    If the max length of first key segment <= 127 bytes the prefix is
     1 byte else it's 2 byte
 
-    prefix         The high bit is set if this is a prefix for the prev key
-    length         Packed length if the previous was a prefix byte
-    [length]       Length character of data
-    next-key-seg   Next key segments
+    (prefix) length  The high bit is set if this is a prefix for the prev key.
+    [suffix length]  Packed length of suffix if the previous was a prefix.
+    (suffix) data    Key data bytes (past the common prefix or whole segment).
+    [next-key-seg]   Next key segments (([packed length], data), ...)
+    pointer          Reference to the data file (last_keyseg->length).
   */
 
   matched=0;  /* how many char's from prefix were alredy matched */
@@ -351,16 +353,23 @@ int _mi_prefix_search(MI_INFO *info, register MI_KEYDEF *keyinfo, uchar *page,
 
     if (packed)
     {
-      if (suffix_len == 0)                      /* Same key */
+      if (suffix_len == 0)
+      {
+        /* == 0x80 or 0x8000, same key, prefix length == old key length. */
         prefix_len=len;
+      }
       else
       {
+        /* > 0x80 or 0x8000, this is prefix lgt, packed suffix lgt follows. */
         prefix_len=suffix_len;
         get_key_length(suffix_len,vseg);
       }
     }
     else
+    {
+      /* Not packed. No prefix used from last key. */
       prefix_len=0;
+    }
 
     len=prefix_len+suffix_len;
     seg_len_pack=get_pack_length(len);
@@ -417,7 +426,12 @@ int _mi_prefix_search(MI_INFO *info, register MI_KEYDEF *keyinfo, uchar *page,
       uint  left;
       uchar *k=kseg+prefix_len;
 
-      left=(len>cmplen) ? cmplen-prefix_len : suffix_len;
+      /*
+        If prefix_len > cmplen then we are in the end-space comparison
+        phase. Do not try to acces the key any more ==> left= 0.
+      */
+      left= ((len <= cmplen) ? suffix_len :
+             ((prefix_len < cmplen) ? cmplen - prefix_len : 0));
 
       matched=prefix_len+left;
 
@@ -455,7 +469,7 @@ int _mi_prefix_search(MI_INFO *info, register MI_KEYDEF *keyinfo, uchar *page,
 	    my_flag= -1;
 	  else
 	  {
-	    /* We have to compare k and vseg as if they where space extended */
+	    /* We have to compare k and vseg as if they were space extended */
 	    uchar *end= k+ (cmplen - len);
 	    for ( ; k < end && *k == ' '; k++) ;
 	    if (k == end)
@@ -474,7 +488,7 @@ int _mi_prefix_search(MI_INFO *info, register MI_KEYDEF *keyinfo, uchar *page,
 	  if ((nextflag & SEARCH_PREFIX) && key_len_left == 0)
 	    goto fix_flag;
 
-	  /* We have to compare k and vseg as if they where space extended */
+	  /* We have to compare k and vseg as if they were space extended */
 	  for (end=vseg + (len-cmplen) ;
 	       vseg < end && *vseg == (uchar) ' ';
 	       vseg++, matched++) ;
diff --git a/mysql-test/r/alter_table.result b/mysql-test/r/alter_table.result
index dd7c5ed4407..6a710a8de10 100644
--- a/mysql-test/r/alter_table.result
+++ b/mysql-test/r/alter_table.result
@@ -541,3 +541,18 @@ create table t1 ( a timestamp );
 alter table t1 add unique ( a(1) );
 ERROR HY000: Incorrect sub part key; the used key part isn't a string, the used length is longer than the key part, or the storage engine doesn't support unique sub keys
 drop table t1;
+create database mysqltest1;
+create table t1 (c1 int);
+alter table t1 rename mysqltest1.t1;
+drop table t1;
+ERROR 42S02: Unknown table 't1'
+alter table mysqltest1.t1 rename t1;
+drop table t1;
+create table t1 (c1 int);
+use mysqltest1;
+drop database mysqltest1;
+alter table test.t1 rename t1;
+ERROR 3D000: No database selected
+alter table test.t1 rename test.t1;
+use test;
+drop table t1;
diff --git a/mysql-test/r/innodb.result b/mysql-test/r/innodb.result
index 4b62e63c49b..b9567e3f45f 100644
--- a/mysql-test/r/innodb.result
+++ b/mysql-test/r/innodb.result
@@ -1703,6 +1703,22 @@ a_id	b_list
 3	NULL
 DROP TABLE t2;
 DROP TABLE t1;
+create temporary table t1 (a int) engine=innodb;
+insert into t1 values (4711);
+truncate t1;
+insert into t1 values (42);
+select * from t1;
+a
+42
+drop table t1;
+create table t1 (a int) engine=innodb;
+insert into t1 values (4711);
+truncate t1;
+insert into t1 values (42);
+select * from t1;
+a
+42
+drop table t1;
 create table t1 (x bigint unsigned not null primary key) engine=innodb;
 insert into t1(x) values (0xfffffffffffffff0),(0xfffffffffffffff1);
 select * from t1;
@@ -1749,7 +1765,7 @@ Variable_name	Value
 Innodb_rows_deleted	2070
 show status like "Innodb_rows_inserted";
 Variable_name	Value
-Innodb_rows_inserted	31718
+Innodb_rows_inserted	31722
 show status like "Innodb_rows_updated";
 Variable_name	Value
 Innodb_rows_updated	29530
diff --git a/mysql-test/r/key.result b/mysql-test/r/key.result
index bce02a1cb0f..bc9d3935bc4 100644
--- a/mysql-test/r/key.result
+++ b/mysql-test/r/key.result
@@ -329,6 +329,23 @@ ERROR 42S21: Duplicate column name 'c1'
 alter table t1 add key (c1,c1,c2);
 ERROR 42S21: Duplicate column name 'c1'
 drop table t1;
+create table t1 (
+c1 int,
+c2 varchar(20) not null,
+primary key (c1),
+key (c2(10))
+) engine=myisam;
+insert into t1 values (1,'');
+insert into t1 values (2,' \t\tTest String');
+insert into t1 values (3,' \n\tTest String');
+update t1 set c2 = 'New Test String' where c1 = 1;
+select * from t1;
+c1	c2
+1	New Test String
+2	 		Test String
+3	 
+	Test String
+drop table t1;
 create table t1 (a varchar(10), b varchar(10), key(a(10),b(10)));
 show create table t1;
 Table	Create Table
diff --git a/mysql-test/r/myisam.result b/mysql-test/r/myisam.result
index 71cb76fe844..ce215d6a7d8 100644
--- a/mysql-test/r/myisam.result
+++ b/mysql-test/r/myisam.result
@@ -594,6 +594,20 @@ check table t1;
 Table	Op	Msg_type	Msg_text
 test.t1	check	status	OK
 drop table t1;
+create table t1 (c1 int);
+insert into t1 values (1),(2),(3),(4);
+checksum table t1;
+Table	Checksum
+test.t1	149057747
+delete from t1 where c1 = 1;
+create table t2 as select * from t1;
+checksum table t1;
+Table	Checksum
+test.t1	984116287
+checksum table t2;
+Table	Checksum
+test.t2	984116287
+drop table t1, t2;
 set storage_engine=MyISAM;
 drop table if exists t1,t2,t3;
 --- Testing varchar ---
@@ -1274,3 +1288,9 @@ show keys from t1;
 Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment
 t1	1	a	1	a	A	8	NULL	NULL	YES	BTREE	
 drop table t1;
+create table t1 (c1 int) engine=myisam pack_keys=0;
+create table t2 (c1 int) engine=myisam pack_keys=1;
+create table t3 (c1 int) engine=myisam pack_keys=default;
+create table t4 (c1 int) engine=myisam pack_keys=2;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '2' at line 1
+drop table t1, t2, t3;
diff --git a/mysql-test/t/alter_table.test b/mysql-test/t/alter_table.test
index 003662fc956..5695822be6b 100644
--- a/mysql-test/t/alter_table.test
+++ b/mysql-test/t/alter_table.test
@@ -369,4 +369,35 @@ create table t1 ( a timestamp );
 alter table t1 add unique ( a(1) );
 drop table t1;
 
+#
+# Bug#11493 - Alter table rename to default database does not work without
+#             db name qualifying
+#
+create database mysqltest1;
+create table t1 (c1 int);
+# Move table to other database.
+alter table t1 rename mysqltest1.t1;
+# Assure that it has moved.
+--error 1051
+drop table t1;
+# Move table back.
+alter table mysqltest1.t1 rename t1;
+# Assure that it is back.
+drop table t1;
+# Now test for correct message if no database is selected.
+# Create t1 in 'test'.
+create table t1 (c1 int);
+# Change to other db.
+use mysqltest1;
+# Drop the current db. This de-selects any db.
+drop database mysqltest1;
+# Now test for correct message.
+--error 1046
+alter table test.t1 rename t1;
+# Check that explicit qualifying works even with no selected db.
+alter table test.t1 rename test.t1;
+# Go back to standard 'test' db.
+use test;
+drop table t1;
+
 # End of 4.1 tests
diff --git a/mysql-test/t/innodb.test b/mysql-test/t/innodb.test
index bf094dd0e5d..b12ddc830ad 100644
--- a/mysql-test/t/innodb.test
+++ b/mysql-test/t/innodb.test
@@ -1231,6 +1231,24 @@ SELECT * FROM (SELECT t1.*,GROUP_CONCAT(t2.b_id SEPARATOR ',') as b_list FROM (t
 DROP TABLE t2;
 DROP TABLE t1;
 
+#
+# Bug#11816 - Truncate table doesn't work with temporary innodb tables
+# This is not an innodb bug, but we test it using innodb.
+#
+create temporary table t1 (a int) engine=innodb;
+insert into t1 values (4711);
+truncate t1;
+insert into t1 values (42);
+select * from t1;
+drop table t1;
+# Show that it works with permanent tables too.
+create table t1 (a int) engine=innodb;
+insert into t1 values (4711);
+truncate t1;
+insert into t1 values (42);
+select * from t1;
+drop table t1;
+
 # End of 4.1 tests
 
 #
diff --git a/mysql-test/t/key.test b/mysql-test/t/key.test
index 91bd1ada8a4..31763b84379 100644
--- a/mysql-test/t/key.test
+++ b/mysql-test/t/key.test
@@ -325,6 +325,23 @@ alter table t1 add key (c1,c2,c1);
 alter table t1 add key (c1,c1,c2);
 drop table t1;
 
+#
+# Bug#12565 - ERROR 1034 when running simple UPDATE or DELETE 
+#             on large MyISAM table
+#
+create table t1 (
+  c1 int,
+  c2 varchar(20) not null,
+  primary key (c1),
+  key (c2(10))
+) engine=myisam;
+insert into t1 values (1,'');
+insert into t1 values (2,' \t\tTest String');
+insert into t1 values (3,' \n\tTest String');
+update t1 set c2 = 'New Test String' where c1 = 1;
+select * from t1;
+drop table t1;
+
 #
 # If we use a partial field for a key that is actually the length of the
 # field, and we extend the field, we end up with a key that includes the
diff --git a/mysql-test/t/myisam.test b/mysql-test/t/myisam.test
index dfb00d5686c..eeac2971788 100644
--- a/mysql-test/t/myisam.test
+++ b/mysql-test/t/myisam.test
@@ -563,6 +563,21 @@ update t1 set c2='A  B' where c1=2;
 check table t1;
 drop table t1;
 
+
+#
+# Bug#12296 - CHECKSUM TABLE reports 0 for the table
+# This happened if the first record was marked as deleted.
+#
+create table t1 (c1 int);
+insert into t1 values (1),(2),(3),(4);
+checksum table t1;
+delete from t1 where c1 = 1;
+create table t2 as select * from t1;
+# The following returns 0 with the bug in place.
+checksum table t1;
+# The above should give the same number as the following.
+checksum table t2;
+drop table t1, t2;
 #
 # Test varchar
 #
@@ -675,4 +690,14 @@ show keys from t1;
 
 drop table t1;
 
+#
+# Bug#10056 - PACK_KEYS option take values greater than 1 while creating table
+#
+create table t1 (c1 int) engine=myisam pack_keys=0;
+create table t2 (c1 int) engine=myisam pack_keys=1;
+create table t3 (c1 int) engine=myisam pack_keys=default;
+--error 1064
+create table t4 (c1 int) engine=myisam pack_keys=2;
+drop table t1, t2, t3;
+
 # End of 4.1 tests
diff --git a/sql/sql_delete.cc b/sql/sql_delete.cc
index 4ec5b43f8e7..3f18b391bda 100644
--- a/sql/sql_delete.cc
+++ b/sql/sql_delete.cc
@@ -768,6 +768,8 @@ bool mysql_truncate(THD *thd, TABLE_LIST *table_list, bool dont_send_ok)
     TABLE *table= *table_ptr;
     table->file->info(HA_STATUS_AUTO | HA_STATUS_NO_LOCK);
     db_type table_type= table->s->db_type;
+    if (!ha_supports_generate(table_type))
+      goto trunc_by_del;
     strmov(path, table->s->path);
     *table_ptr= table->next;			// Unlink table from list
     close_temporary(table,0);
@@ -786,7 +788,7 @@ bool mysql_truncate(THD *thd, TABLE_LIST *table_list, bool dont_send_ok)
 
   (void) sprintf(path,"%s/%s/%s%s",mysql_data_home,table_list->db,
 		 table_list->table_name,reg_ext);
-  fn_format(path,path,"","",4);
+  fn_format(path, path, "", "", MY_UNPACK_FILENAME);
 
   if (!dont_send_ok)
   {
@@ -798,19 +800,7 @@ bool mysql_truncate(THD *thd, TABLE_LIST *table_list, bool dont_send_ok)
       DBUG_RETURN(TRUE);
     }
     if (!ha_supports_generate(table_type) || thd->lex->sphead)
-    {
-      /* Probably InnoDB table */
-      ulong save_options= thd->options;
-      table_list->lock_type= TL_WRITE;
-      thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_NOT_AUTOCOMMIT);
-      ha_enable_transaction(thd, FALSE);
-      mysql_init_select(thd->lex);
-      error= mysql_delete(thd, table_list, (COND*) 0, (SQL_LIST*) 0,
-			  HA_POS_ERROR, LL(0));
-      ha_enable_transaction(thd, TRUE);
-      thd->options= save_options;
-      DBUG_RETURN(error);
-    }
+      goto trunc_by_del;
     if (lock_and_wait_for_table_name(thd, table_list))
       DBUG_RETURN(TRUE);
   }
@@ -844,4 +834,17 @@ end:
     VOID(pthread_mutex_unlock(&LOCK_open));
   }
   DBUG_RETURN(error);
+
+ trunc_by_del:
+  /* Probably InnoDB table */
+  ulong save_options= thd->options;
+  table_list->lock_type= TL_WRITE;
+  thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_NOT_AUTOCOMMIT);
+  ha_enable_transaction(thd, FALSE);
+  mysql_init_select(thd->lex);
+  error= mysql_delete(thd, table_list, (COND*) 0, (SQL_LIST*) 0,
+                      HA_POS_ERROR, LL(0));
+  ha_enable_transaction(thd, TRUE);
+  thd->options= save_options;
+  DBUG_RETURN(error);
 }
diff --git a/sql/sql_parse.cc b/sql/sql_parse.cc
index c023c525079..d6f7a4b1350 100644
--- a/sql/sql_parse.cc
+++ b/sql/sql_parse.cc
@@ -2991,7 +2991,24 @@ end_with_restore_list:
         goto error;
       }
       if (!select_lex->db)
-	select_lex->db= first_table->db;
+      {
+        /*
+          In the case of ALTER TABLE ... RENAME we should supply the
+          default database if the new name is not explicitly qualified
+          by a database. (Bug #11493)
+        */
+        if (lex->alter_info.flags & ALTER_RENAME)
+        {
+          if (! thd->db)
+          {
+            my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR), MYF(0));
+            goto error;
+          }
+          select_lex->db= thd->db;
+        }
+        else
+          select_lex->db= first_table->db;
+      }
       if (check_access(thd, ALTER_ACL, first_table->db,
 		       &first_table->grant.privilege, 0, 0) ||
 	  check_access(thd,INSERT_ACL | CREATE_ACL,select_lex->db,&priv,0,0)||
diff --git a/sql/sql_table.cc b/sql/sql_table.cc
index d7609bc2f58..1bb6e66a12e 100644
--- a/sql/sql_table.cc
+++ b/sql/sql_table.cc
@@ -4091,9 +4091,16 @@ bool mysql_checksum_table(THD *thd, TABLE_LIST *tables, HA_CHECK_OPT *check_opt)
 	  protocol->store_null();
 	else
 	{
-	  while (!t->file->rnd_next(t->record[0]))
+	  for (;;)
 	  {
 	    ha_checksum row_crc= 0;
+            int error= t->file->rnd_next(t->record[0]);
+            if (unlikely(error))
+            {
+              if (error == HA_ERR_RECORD_DELETED)
+                continue;
+              break;
+            }
 	    if (t->record[0] != (byte*) t->field[0]->ptr)
 	      row_crc= my_checksum(row_crc, t->record[0],
 				   ((byte*) t->field[0]->ptr) - t->record[0]);
diff --git a/sql/sql_yacc.yy b/sql/sql_yacc.yy
index 898c794d4b4..90066318c60 100644
--- a/sql/sql_yacc.yy
+++ b/sql/sql_yacc.yy
@@ -2669,8 +2669,27 @@ create_table_option:
 	| PASSWORD opt_equal TEXT_STRING_sys	{ Lex->create_info.password=$3.str; Lex->create_info.used_fields|= HA_CREATE_USED_PASSWORD; }
 	| COMMENT_SYM opt_equal TEXT_STRING_sys	{ Lex->create_info.comment=$3.str; Lex->create_info.used_fields|= HA_CREATE_USED_COMMENT; }
 	| AUTO_INC opt_equal ulonglong_num	{ Lex->create_info.auto_increment_value=$3; Lex->create_info.used_fields|= HA_CREATE_USED_AUTO;}
-	| PACK_KEYS_SYM opt_equal ulong_num	{ Lex->create_info.table_options|= $3 ? HA_OPTION_PACK_KEYS : HA_OPTION_NO_PACK_KEYS; Lex->create_info.used_fields|= HA_CREATE_USED_PACK_KEYS;}
-	| PACK_KEYS_SYM opt_equal DEFAULT	{ Lex->create_info.table_options&= ~(HA_OPTION_PACK_KEYS | HA_OPTION_NO_PACK_KEYS); Lex->create_info.used_fields|= HA_CREATE_USED_PACK_KEYS;}
+        | PACK_KEYS_SYM opt_equal ulong_num
+          {
+            switch($3) {
+            case 0:
+                Lex->create_info.table_options|= HA_OPTION_NO_PACK_KEYS;
+                break;
+            case 1:
+                Lex->create_info.table_options|= HA_OPTION_PACK_KEYS;
+                break;
+            default:
+                yyerror(ER(ER_SYNTAX_ERROR));
+                YYABORT;
+            }
+            Lex->create_info.used_fields|= HA_CREATE_USED_PACK_KEYS;
+          }
+        | PACK_KEYS_SYM opt_equal DEFAULT
+          {
+            Lex->create_info.table_options&=
+              ~(HA_OPTION_PACK_KEYS | HA_OPTION_NO_PACK_KEYS);
+            Lex->create_info.used_fields|= HA_CREATE_USED_PACK_KEYS;
+          }
 	| CHECKSUM_SYM opt_equal ulong_num	{ Lex->create_info.table_options|= $3 ? HA_OPTION_CHECKSUM : HA_OPTION_NO_CHECKSUM; Lex->create_info.used_fields|= HA_CREATE_USED_CHECKSUM; }
 	| DELAY_KEY_WRITE_SYM opt_equal ulong_num { Lex->create_info.table_options|= $3 ? HA_OPTION_DELAY_KEY_WRITE : HA_OPTION_NO_DELAY_KEY_WRITE;  Lex->create_info.used_fields|= HA_CREATE_USED_DELAY_KEY_WRITE; }
 	| ROW_FORMAT_SYM opt_equal row_types	{ Lex->create_info.row_type= $3;  Lex->create_info.used_fields|= HA_CREATE_USED_ROW_FORMAT; }