Test that all MERGE tables comes from the same database

Docs/manual.texi:
  Changelog and more documentation about ALTER TABLE
include/mysqld_error.h:
  New error message
mysql-test/t/merge.test:
  Test of error conditions
sql/gen_lex_hash.cc:
  Smaller array
sql/ha_myisammrg.cc:
  Cleanup
sql/share/czech/errmsg.txt:
  New message
sql/share/danish/errmsg.txt:
  New message
sql/share/dutch/errmsg.txt:
  New message
sql/share/english/errmsg.txt:
  New message
sql/share/estonian/errmsg.txt:
  New message
sql/share/french/errmsg.txt:
  New message
sql/share/german/errmsg.txt:
  New message
sql/share/greek/errmsg.txt:
  New message
sql/share/hungarian/errmsg.txt:
  New message
sql/share/italian/errmsg.txt:
  New message
sql/share/japanese/errmsg.txt:
  New message
sql/share/korean/errmsg.txt:
  New message
sql/share/norwegian-ny/errmsg.txt:
  New message
sql/share/norwegian/errmsg.txt:
  New message
sql/share/polish/errmsg.txt:
  New message
sql/share/portuguese/errmsg.txt:
  New message
sql/share/romanian/errmsg.txt:
  New message
sql/share/russian/errmsg.txt:
  New message
sql/share/slovak/errmsg.txt:
  New message
sql/share/spanish/errmsg.txt:
  New message
sql/share/swedish/errmsg.txt:
  New message

Docs/manual.texi

@@ -4502,6 +4502,13 @@ Minimum respective maximum possible @code{double} value.
 
 @item
 @code{LIMIT} on negative numbers are treated as big positive numbers.
+@item
+If you use @code{ALTER TABLE} to first add an @code{UNIQUE} index to a
+table used in a @code{MERGE} table and then use @code{ALTER TABLE} to
+add a normal index on the @code{MERGE} table, the key order will be
+different for the tables if there was an old not-unique key in the
+table. This is because @code{ALTER TABLE} puts @code{UNIQUE} keys before
+normal keys to be able to detect duplicate keys as early as possible.
 @end itemize
 
 The following are known bugs in earlier versions of MySQL:
@@ -11688,9 +11695,9 @@ work:
 
 @example
 CC="cc -pthread"
-CFLAGS="-O4 -ansi_alias -ansi_args -fast -inline speed -speculate all -arch host"
+CFLAGS="-O4 -ansi_alias -ansi_args -fast -inline speed all -arch host"
 CXX="cxx -pthread"
-CXXFLAGS="-O4 -ansi_alias -ansi_args -fast -inline speed -speculate all -arch host"
+CXXFLAGS="-O4 -ansi_alias -ansi_args -fast -inline speed all -arch host"
 export CC CFLAGS CXX CXXFLAGS
 ./configure \
 --prefix=/usr/local/mysql \
@@ -34149,6 +34156,12 @@ index exists, it drops the first @code{UNIQUE} index in the table.
 (MySQL marks the first @code{UNIQUE} key as the @code{PRIMARY KEY}
 if no @code{PRIMARY KEY} was specified explicitly.)
 
+@findex UNIQUE
+@findex PRIMARY KEY
+If you add a @code{UNIQUE INDEX} or @code{PRIMARY KEY} to a table, this
+is stored before any not @code[UNIQUE} index so that MySQL can detect
+duplicate keys as early as possible.
+
 @findex ORDER BY
 @item
 @code{ORDER BY} allows you to create the new table with the rows in a
@@ -35558,14 +35571,15 @@ mapped tables. (We plan to fix this in 4.0).
 
 With identical tables we mean that all tables are created with identical
 column and key information.  You can't put a MERGE over tables where the
-columns are packed differently or doesn't have exactly the same columns.
-Some of the tables can however be compressed with @code{myisampack}.
-@xref{myisampack}.
+columns are packed differently, doesn't have exactly the same columns or
+have the keys in different order.  Some of the tables can however be
+compressed with @code{myisampack}.  @xref{myisampack}.
 
 When you create a @code{MERGE} table, you will get a @code{.frm} table
 definition file and a @code{.MRG} table list file.  The @code{.MRG} just
 contains a list of the index files (@code{.MYI} files) that should
-be used as one.
+be used as one.  All used tables must be in the same database as the
+@code{MERGE} table itself.
 
 For the moment you need to have @code{SELECT}, @code{UPDATE}, and
 @code{DELETE} privileges on the tables you map to a @code{MERGE} table.
@@ -35691,7 +35705,6 @@ Change the @code{.MRG} file and issue a @code{FLUSH TABLE} on the
 read the new definition file.
 @end itemize
 
-
 @node ISAM, HEAP, MERGE, Table types
 @section ISAM Tables
 
@@ -46683,15 +46696,26 @@ not yet 100% confident in this code.
 @appendixsubsec Changes in release 3.23.42
 @itemize @bullet
 @item
+Enforce that all tables in a @code{MERGE} table comes from the same
+database.
+@item
+Fixed bug with @code{LOAD DATA INFILE} and transactional tables.
+@item
+Fix bug when using @code{INSERT DELAYED} with wrong column definition.
+@item
 Fixed bug in @code{InnoDB} and @code{AUTO_INCREMENT} columns.
 @item
+Fixed critical bug in @code{InnoDB} and @code{BLOB}'s.  If one has used
+@code{BLOB}'s larger than 8K in an @code{InnoDB} table one must dump
+the table with @code{mysqldump}, drop it and restore it from the dump.
+@item
 Applied large patch for OS/2 from Yuri Dario.
 @item
 Fixed problem with InnoDB when one could get the error @code{Can't
 execute the given command...} even when one didn't have an active
 transaction.
 @item
-Applied some fixes for Gemini.
+Applied some minor fixes that concerns Gemini.
 @item
 Use real arithmetic operations even in integer context if not
 all arguments are integers. (Fixes uncommon bug in some integer

include/mysqld_error.h

@@ -212,4 +212,5 @@
 #define ER_CREATE_DB_WITH_READ_LOCK 1209
 #define ER_WRONG_ARGUMENTS 1210
 #define ER_NO_PERMISSON_TO_CREATE_USER 1211
-#define ER_ERROR_MESSAGES 212
+#define ER_UNION_TABLES_IN_DIFFERENT_DIR 1212
+#define ER_ERROR_MESSAGES 213

mysql-test/t/merge.test

@@ -35,9 +35,13 @@ show create table t3;
 
 # The following should give errors
 create table t4 (a int not null, b char(10), key(a)) type=MERGE UNION=(t1,t2);
+--error 1016
+select * from t4;
+--error 1212
+create table t5 (a int not null, b char(10), key(a)) type=MERGE UNION=(test.t1,test_2.t2);
 
 # Because of windows, it's important that we drop the merge tables first!
-drop table if exists t4,t3,t1,t2;
+drop table if exists t5,t4,t3,t1,t2;
 
 create table t1 (c char(10)) type=myisam;
 create table t2 (c char(10)) type=myisam;

sql/gen_lex_hash.cc

@@ -472,7 +472,7 @@ int main(int argc,char **argv)
   int error;
 
   MY_INIT(argv[0]);
-  start_value=4597269L;  best_t1=6001982L;  best_t2=5063828L;  best_type=4; /* mode=4513  add=8  type: 0 */
+  start_value=6130115L; best_t1=3632784L;  best_t2=86437L;  best_type=3; /* mode=4229  add=2  type: 0 */
   if (get_options(argc,(char **) argv))
     exit(1);
 

sql/ha_myisammrg.cc

@@ -86,7 +86,6 @@ int ha_myisammrg::delete_row(const byte * buf)
 int ha_myisammrg::index_read(byte * buf, const byte * key,
 			  uint key_len, enum ha_rkey_function find_flag)
 {
-//  return (my_errno=HA_ERR_WRONG_COMMAND);
   statistic_increment(ha_read_key_count,&LOCK_status);
   int error=myrg_rkey(file,buf,active_index, key, key_len, find_flag);
   table->status=error ? STATUS_NOT_FOUND: 0;
@@ -96,7 +95,6 @@ int ha_myisammrg::index_read(byte * buf, const byte * key,
 int ha_myisammrg::index_read_idx(byte * buf, uint index, const byte * key,
 				 uint key_len, enum ha_rkey_function find_flag)
 {
-//  return (my_errno=HA_ERR_WRONG_COMMAND);
   statistic_increment(ha_read_key_count,&LOCK_status);
   int error=myrg_rkey(file,buf,index, key, key_len, find_flag);
   table->status=error ? STATUS_NOT_FOUND: 0;
@@ -105,7 +103,6 @@ int ha_myisammrg::index_read_idx(byte * buf, uint index, const byte * key,
 
 int ha_myisammrg::index_next(byte * buf)
 {
-//  return (my_errno=HA_ERR_WRONG_COMMAND);
   statistic_increment(ha_read_next_count,&LOCK_status);
   int error=myrg_rnext(file,buf,active_index);
   table->status=error ? STATUS_NOT_FOUND: 0;
@@ -114,7 +111,6 @@ int ha_myisammrg::index_next(byte * buf)
 
 int ha_myisammrg::index_prev(byte * buf)
 {
-// return (my_errno=HA_ERR_WRONG_COMMAND);
   statistic_increment(ha_read_prev_count,&LOCK_status);
   int error=myrg_rprev(file,buf, active_index);
   table->status=error ? STATUS_NOT_FOUND: 0;
@@ -123,7 +119,6 @@ int ha_myisammrg::index_prev(byte * buf)
 
 int ha_myisammrg::index_first(byte * buf)
 {
-//  return (my_errno=HA_ERR_WRONG_COMMAND);
   statistic_increment(ha_read_first_count,&LOCK_status);
   int error=myrg_rfirst(file, buf, active_index);
   table->status=error ? STATUS_NOT_FOUND: 0;
@@ -132,7 +127,6 @@ int ha_myisammrg::index_first(byte * buf)
 
 int ha_myisammrg::index_last(byte * buf)
 {
-//  return (my_errno=HA_ERR_WRONG_COMMAND);
   statistic_increment(ha_read_last_count,&LOCK_status);
   int error=myrg_rlast(file, buf, active_index);
   table->status=error ? STATUS_NOT_FOUND: 0;

sql/share/czech/errmsg.txt

@@ -222,3 +222,4 @@
 "CREATE DATABASE not allowed while thread is holding global read lock",
 "Wrong arguments to %s",
 "%-.32s@%-.64s is not allowed to create new users",
+"Incorrect table definition; All MERGE tables must be in the same database",

sql/share/danish/errmsg.txt

@@ -216,3 +216,4 @@
 "CREATE DATABASE er ikke tilladt mens en tråd holder på globalt read lock",
 "Wrong arguments to %s",
 "%-.32s@%-.64s is not allowed to create new users",
+"Incorrect table definition; All MERGE tables must be in the same database",

sql/share/dutch/errmsg.txt

@@ -217,3 +217,4 @@
 "CREATE DATABASE niet toegestaan terwijl thread een globale 'read lock' bezit",
 "Foutieve parameters voor %s",
 "%-.32s@%-.64s is not allowed to create new users",
+"Incorrect table definition; All MERGE tables must be in the same database",

sql/share/english/errmsg.txt

@@ -213,3 +213,4 @@
 "CREATE DATABASE not allowed while thread is holding global read lock",
 "Wrong arguments to %s",
 "%-.32s@%-.64s is not allowed to create new users",
+"Incorrect table definition; All MERGE tables must be in the same database",

sql/share/estonian/errmsg.txt

@@ -217,3 +217,4 @@
 "CREATE DATABASE not allowed while thread is holding global read lock",
 "Wrong arguments to %s",
 "%-.32s@%-.64s is not allowed to create new users",
+"Incorrect table definition; All MERGE tables must be in the same database",

sql/share/french/errmsg.txt

@@ -213,3 +213,4 @@
 "CREATE DATABASE not allowed while thread is holding global read lock",
 "Wrong arguments to %s",
 "%-.32s@%-.64s is not allowed to create new users",
+"Incorrect table definition; All MERGE tables must be in the same database",

sql/share/german/errmsg.txt

@@ -216,3 +216,4 @@
 "CREATE DATABASE not allowed while thread is holding global read lock",
 "Wrong arguments to %s",
 "%-.32s@%-.64s is not allowed to create new users",
+"Incorrect table definition; All MERGE tables must be in the same database",

sql/share/greek/errmsg.txt

@@ -213,3 +213,4 @@
 "CREATE DATABASE not allowed while thread is holding global read lock",
 "Wrong arguments to %s",
 "%-.32s@%-.64s is not allowed to create new users",
+"Incorrect table definition; All MERGE tables must be in the same database",

sql/share/hungarian/errmsg.txt

@@ -215,3 +215,4 @@
 "CREATE DATABASE not allowed while thread is holding global read lock",
 "Wrong arguments to %s",
 "%-.32s@%-.64s is not allowed to create new users",
+"Incorrect table definition; All MERGE tables must be in the same database",

sql/share/italian/errmsg.txt

@@ -213,3 +213,4 @@
 "CREATE DATABASE not allowed while thread is holding global read lock",
 "Wrong arguments to %s",
 "%-.32s@%-.64s is not allowed to create new users",
+"Incorrect table definition; All MERGE tables must be in the same database",

sql/share/japanese/errmsg.txt

@@ -215,3 +215,4 @@
 "CREATE DATABASE not allowed while thread is holding global read lock",
 "Wrong arguments to %s",
 "%-.32s@%-.64s is not allowed to create new users",
+"Incorrect table definition; All MERGE tables must be in the same database",

sql/share/korean/errmsg.txt

@@ -213,3 +213,4 @@
 "CREATE DATABASE not allowed while thread is holding global read lock",
 "Wrong arguments to %s",
 "%-.32s@%-.64s is not allowed to create new users",
+"Incorrect table definition; All MERGE tables must be in the same database",

sql/share/norwegian-ny/errmsg.txt

@@ -215,3 +215,4 @@
 "CREATE DATABASE not allowed while thread is holding global read lock",
 "Wrong arguments to %s",
 "%-.32s@%-.64s is not allowed to create new users",
+"Incorrect table definition; All MERGE tables must be in the same database",

sql/share/norwegian/errmsg.txt

@@ -215,3 +215,4 @@
 "CREATE DATABASE not allowed while thread is holding global read lock",
 "Wrong arguments to %s",
 "%-.32s@%-.64s is not allowed to create new users",
+"Incorrect table definition; All MERGE tables must be in the same database",

sql/share/polish/errmsg.txt

@@ -217,3 +217,4 @@
 "CREATE DATABASE not allowed while thread is holding global read lock",
 "Wrong arguments to %s",
 "%-.32s@%-.64s is not allowed to create new users",
+"Incorrect table definition; All MERGE tables must be in the same database",

sql/share/portuguese/errmsg.txt

@@ -213,3 +213,4 @@
 "CREATE DATABASE não permitido enquanto uma 'thread' está mantendo um travamento global de leitura",
 "Argumentos errados para %s",
 "Não é permitido a %-.32s@%-.64s criar novos usuários",
+"Incorrect table definition; All MERGE tables must be in the same database",

sql/share/romanian/errmsg.txt

@@ -217,3 +217,4 @@
 "CREATE DATABASE not allowed while thread is holding global read lock",
 "Wrong arguments to %s",
 "%-.32s@%-.64s is not allowed to create new users",
+"Incorrect table definition; All MERGE tables must be in the same database",

sql/share/russian/errmsg.txt

@@ -216,3 +216,4 @@
 "CREATE DATABASE not allowed while thread is holding global read lock",
 "Wrong arguments to %s",
 "%-.32s@%-.64s is not allowed to create new users",
+"Incorrect table definition; All MERGE tables must be in the same database",

sql/share/slovak/errmsg.txt

@@ -221,3 +221,4 @@
 "CREATE DATABASE not allowed while thread is holding global read lock",
 "Wrong arguments to %s",
 "%-.32s@%-.64s is not allowed to create new users",
+"Incorrect table definition; All MERGE tables must be in the same database",

sql/share/spanish/errmsg.txt

@@ -214,3 +214,4 @@
 "CREATE DATABASE no permitido mientras un thread está ejerciendo un bloqueo de lectura global",
 "Wrong arguments to %s",
 "%-.32s@%-.64s is not allowed to create new users",
+"Incorrect table definition; All MERGE tables must be in the same database",

sql/share/swedish/errmsg.txt

@@ -213,3 +213,4 @@
 "CREATE DATABASE är inte tillåtet när man har ett globalt läs-lås",
 "Felaktiga argument till %s",
 "%-.32s@%-.64s har inte rättigheter att skapa nya användare",
+"Felaktig tabell definition: Alla tabeller i en MERGE tabell måste vara i samma databas",

sql/sql_parse.cc

@@ -2178,10 +2178,18 @@ static bool check_merge_table_access(THD *thd, char *db,
   int error=0;
   if (table_list)
   {
-    /* Force all tables to use the current database */
+    /* Check that all tables use the current database */
     TABLE_LIST *tmp;
     for (tmp=table_list; tmp ; tmp=tmp->next)
-      tmp->db=db;
+    {
+      if (!tmp->db || !tmp->db[0])
+	tmp->db=db;
+      else if (!strcmp(tmp->db,db))
+      {
+	send_error(&thd->net,ER_UNION_TABLES_IN_DIFFERENT_DIR);
+	return 1;
+      }
+    }
     error=check_table_access(thd, SELECT_ACL | UPDATE_ACL | DELETE_ACL,
 			     table_list);
   }