Fixes for MERGE TABLES and HEAP tables

Docs/manual.texi

@@ -195,8 +195,8 @@ Installing a MySQL binary distribution
 
 System-specific issues
 
-* Binary notes-Linux::          Linux notes
-* Binary notes-HP-UX::          HP-UX notes
+* Binary notes-Linux::          Linux notes for binary distribution
+* Binary notes-HP-UX::          HP-UX notes for binary distribution
 
 Installing a MySQL source distribution
 
@@ -259,6 +259,7 @@ Windows notes
 * Windows and SSH::             Connecting to a remote @strong{MySQL} from Windows with SSH
 * Windows symbolic links::      Splitting data across different disks under Win32
 * Windows compiling::           Compiling MySQL clients on Windows.
+* Windows and BDB tables.::     
 * Windows vs Unix::             @strong{MySQL}-Windows compared to Unix @strong{MySQL}
 
 Post-installation setup and testing
@@ -4568,8 +4569,8 @@ files.
 @subsection System-specific issues
 
 @menu
-* Binary notes-Linux::          Linux notes
-* Binary notes-HP-UX::          HP-UX notes
+* Binary notes-Linux::          Linux notes for binary distribution
+* Binary notes-HP-UX::          HP-UX notes for binary distribution
 @end menu
 
 The following sections indicate some of the issues that have been observed
@@ -4577,7 +4578,7 @@ on particular systems when installing @strong{MySQL} from a binary
 distribution.
 
 @node Binary notes-Linux, Binary notes-HP-UX, Binary install system issues, Binary install system issues
-@subsubsection Linux notes
+@subsubsection Linux notes for binary distribution
 
 @strong{MySQL} needs at least Linux 2.0.
 
@@ -4653,7 +4654,7 @@ and clients on the same machine.  We hope that the @code{Linux 2.4}
 kernel will fix this problem in the future.
 
 @node Binary notes-HP-UX,  , Binary notes-Linux, Binary install system issues
-@subsubsection HP-UX notes
+@subsubsection HP-UX notes for binary distribution
 
 Some of the binary distributions of @strong{MySQL} for HP-UX is
 distributed as an HP depot file and as a tar file.  To use the depot
@@ -7203,6 +7204,7 @@ is also described in the @file{README} file that comes with the
 * Windows and SSH::             Connecting to a remote @strong{MySQL} from Windows with SSH
 * Windows symbolic links::      Splitting data across different disks under Win32
 * Windows compiling::           Compiling MySQL clients on Windows.
+* Windows and BDB tables.::     
 * Windows vs Unix::             @strong{MySQL}-Windows compared to Unix @strong{MySQL}
 @end menu
 
@@ -7511,7 +7513,7 @@ should create the file @file{C:\mysql\data\foo.sym} that should contains the
 text @code{D:\data\foo}.  After this, all tables created in the database
 @code{foo} will be created in @file{D:\data\foo}.
 
-@node Windows compiling, Windows vs Unix, Windows symbolic links, Windows
+@node Windows compiling, Windows and BDB tables., Windows symbolic links, Windows
 @subsection Compiling MySQL clients on Windows.
 
 In your source files, you should include @file{windows.h} before you include
@@ -7531,7 +7533,17 @@ with the static @file{mysqlclient.lib} library.
 Note that as the mysqlclient libraries are compiled as threaded libraries,
 you should also compile your code to be multi-threaded!
 
-@node Windows vs Unix,  , Windows compiling, Windows
+@node Windows and BDB tables., Windows vs Unix, Windows compiling, Windows
+@subsection Windows and BDB tables.
+
+We are working on removing the requirement that one must have a primary
+key in a BDB table; As soon as this is fixed we will throughly test the
+BDB interface by running the @strong{MySQL} benchmark + our internal
+test suite on it.  When the above is done we will start release binary
+distributions (for windows and Unix) of @strong{MySQL} that will include
+support for BDB tables.
+
+@node Windows vs Unix,  , Windows and BDB tables., Windows
 @subsection MySQL-Windows compared to Unix MySQL
 
 @strong{MySQL}-Windows has by now proven itself to be very stable. This version
@@ -16445,6 +16457,7 @@ or	PASSWORD = "string"
 or	DELAY_KEY_WRITE = @{0 | 1@}
 or      ROW_FORMAT= @{ default | dynamic | static | compressed @}
 or	RAID_TYPE= @{1 | STRIPED | RAID0 @} RAID_CHUNKS=#  RAID_CHUNKSIZE=#;
+or	UNION = (table_name,[table_name...])
 
 select_statement:
 	[IGNORE | REPLACE] SELECT ...  (Some legal select statement)
@@ -16742,8 +16755,14 @@ If you specify @code{RAID_TYPE=STRIPED} for a @code{MyISAM} table,
 to the data file, the @code{RAID} handler will map the first
 @code{RAID_CHUNKSIZE} *1024 bytes to the first file, the next
 @code{RAID_CHUNKSIZE} *1024 bytes to the next file and so on.
-@end itemize
 
+@code{UNION} is used when you want to use a collection of identical
+tables as one. This only works with MERGE tables. @xref{MERGE}.
+
+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.
+All mapped tables must be in the same database as the @code{MERGE} table.
+@end itemize
 
 @node Silent column changes,  , CREATE TABLE, CREATE TABLE
 @subsection Silent column specification changes
@@ -20633,9 +20652,10 @@ missing is a way from the SQL prompt to say which tables are part of the
 @code{MERGE} table.
 
 A @code{MERGE} table is a collection of identical @code{MyISAM} tables
-that can be used as one.  You can only @code{SELECT} from the collection
-of tables. If you @code{DROP} the @code{MERGE} table, you are only
-dropping the @code{MERGE} specification.
+that can be used as one.  You can only @code{SELECT}, @code{DELETE} and
+@code{UPDATE} from the collection of tables.  If you @code{DROP} the
+@code{MERGE} table, you are only dropping the @code{MERGE}
+specification.
 
 With identical tables we mean that all tables are created with identical
 column information.  Some of the tables can be compressed with
@@ -20646,7 +20666,10 @@ 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.
 
-@code{MERGE} tables helps you solve the following problems:
+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.
+
+@code{MERGE} tables can help you solve the following problems:
 
 @itemize @bullet
 @item
@@ -20671,13 +20694,22 @@ are mapped to a @code{MERGE} file than trying to repair a real big file.
 Instant mapping of many files as one;  A @code{MERGE} table uses the
 index of the individual tables;  It doesn't need an index of its one.
 This makes @code{MERGE} table collections VERY fast to make or remap.
+@item
+If you have a set of tables which you join to a big tables on demand or
+batch, you should instead create a @code{MERGE} table on them on demand.
+This is much faster and will save a lot of disk space.
+@item
+Go around the file size limit for the operating system.
 @end itemize
 
 The disadvantages with @code{MERGE} tables are:
 
 @itemize @bullet
 @item
-@code{MERGE} tables are read-only.
+You can't use @code{INSERT} on @code{MERGE} tables, as @strong{MySQL} can't know
+in which of the tables we should insert the row.
+@item
+You can only use identical @code{MyISAM} tables for a @code{MERGE} table.
 @item
 @code{MERGE} tables uses more file descriptors: If you are using a
 @strong{MERGE} that maps over 10 tables and 10 users are using this, you
@@ -20703,18 +20735,15 @@ CREATE TABLE t1 (a INT AUTO_INCREMENT PRIMARY KEY, message CHAR(20));
 CREATE TABLE t2 (a INT AUTO_INCREMENT PRIMARY KEY, message CHAR(20));
 INSERT INTO t1 (message) VALUES ("Testing"),("table"),("t1");
 INSERT INTO t2 (message) VALUES ("Testing"),("table"),("t2");
-CREATE TABLE total (a INT NOT NULL, message CHAR(20), KEY(a)) TYPE=MERGE;
+CREATE TABLE total (a INT NOT NULL, message CHAR(20), KEY(a)) TYPE=MERGE UNION=(t1,t2);
 @end example
 
 Note that we didn't create an @code{UNIQUE} or @code{PRIMARY KEY} in the
 @code{total} table as the key isn't going to be unique in the @code{total}
 table.
 
-(We plan to in the future add the information in the @code{MERGE} handler
-that unique keys are not necessarily unique in the @code{MERGE} table.)
-
-Now you have to use tool (editor, unix command...) to insert the file
-names into the 'total' table:
+Note that you can also manipulate the @code{.MRG} file directly from
+the outside of the @code{MySQL} server:
 
 @example
 shell> cd /mysql-data-directory/current-database
@@ -20737,13 +20766,11 @@ mysql> select * from total;
 +---+---------+
 @end example
 
-To remap a @code{MERGE} table you must either @code{DROP} it and recreate it
-or change the @code{.MRG} file and issue a @code{FLUSH TABLE} on the
-@code{MERGE} table to force the handler to read the new definition file.
-
-You can also put full paths to the index files in the @code{.MRG} file;  If
-you don't do this, the @code{MERGE} handler assumes that the index files
-are in the same directory as the @code{.MRG} file.
+To remap a @code{MERGE} table you must either @code{DROP} it and
+recreate it, use @code{ALTER TABLE} with a new @code{UNION}
+specification or change the @code{.MRG} file and issue a @code{FLUSH
+TABLE} on the @code{MERGE} table and all underlying tables to force the
+handler to read the new definition file.
 
 @node ISAM, HEAP, MERGE, Table types
 @section ISAM tables
@@ -28799,6 +28826,48 @@ string to a time. This would be great if the source was a text file, but
 is plain stupid when the source is an ODBC connection that reports
 exact types for each column.
 @end itemize
+@item Word
+
+To retrieve data from @strong{MySQL}to Word/Excel documents, you need to
+use the @code{MyODBC} driver and the Add-in Microsoft Query help.
+
+For example, create a db with a table with 2 columns text.
+
+@itemize @bullet
+@item
+Insert rows using the mysql client command line tool.
+@item
+Create a DSN file using the MyODBC driver e.g. my for the db above.
+@item 
+Open the Word application.
+@item
+Create a blank new documentation.
+@item
+Using the tool bar called Database, press the button insert database.
+@item
+Press the button Get Data.
+@item
+At the right hand of the screen Get Data, press the button Ms Query.
+@item
+In the Ms Query create a New Data Source using the DSN file my.
+@item
+Select the new query.
+@item
+Select the columns that you want.
+@item
+Make a filter if you want.
+@item
+Make a Sort if you want.
+@item
+Select Return Data to Microsoft Word.
+@item
+Click Finish.
+@item
+Click Insert data and select the records.
+@item
+Click OK and you see the rows in your Word document.
+@end itemize 
+
 @item odbcadmin
 Test program for ODBC.
 @item Delphi
@@ -36224,6 +36293,11 @@ though, so 3.23 is not released as a stable version yet.
 @appendixsubsec Changes in release 3.23.25
 @itemize @bullet
 @item
+@code{HEAP} tables didn't use keys properly. (Bug from 3.23.23)
+@item
+Added better support for @code{MERGE} tables (keys, mapping, creation,
+documentation...). @xref{MERGE}.
+@item
 Fixed bug in mysqldump from 3.23 which caused that some @code{CHAR} columns
 wheren't quoted.
 @item
@@ -40304,6 +40378,8 @@ Fixed @code{DISTINCT} with calculated columns.
 
 @itemize @bullet
 @item
+For the moment @code{MATCH} only works with @code{SELECT} statements.
+@item
 You cannot build in another directory when using
 MIT-pthreads. Because this requires changes to MIT-pthreads, we are not
 likely to fix this.
@@ -40391,6 +40467,9 @@ the error value 'empty string', with numeric value 0.
 @item
 If you execute a @code{PROCEDURE} on a query with returns an empty set then
 in some cases the @code{PROCEDURE} will not transform the columns.
+@item
+Creation of a table of type @code{MERGE} doesn't check if the underlaying
+tables are of compatible types.
 @end itemize
 
 The following is known bugs in earlier versions of @strong{MySQL}:
@@ -40464,6 +40543,8 @@ Allow users to change startup options.
 @item
 Subqueries. @code{select id from t where grp in (select grp from g where u > 100)}
 @item
+Add range checking to @code{MERGE} tables.
+@item
 Port of @strong{MySQL} to BeOS.
 @item
 Add a temporary key buffer cache during @code{insert/delete/update} so that we

extra/perror.c

@@ -17,7 +17,7 @@
 
 /* Return error-text for system error messages and nisam messages */
 
-#define PERROR_VERSION "2.2"
+#define PERROR_VERSION "2.3"
 
 #include <global.h>
 #include <my_sys.h>
@@ -59,9 +59,11 @@ static HA_ERRORS ha_errlist[]=
   { 136,"No more room in index file" },
   { 137,"No more records (read after end of file)" },
   { 138,"Unsupported extension used for table" },
-  { 139,"Too big row (>= 24 M)"},
+  { 139,"Too big row (>= 16 M)"},
   { 140,"Wrong create options"},
-  { 141,"Dupplicate unique on write or update"},
+  { 141,"Duplicate unique on write or update"},
+  { 142,"Unknown character set used"},
+  { 143,"Conflicting table definition between MERGE and mapped table"},
   { 0,NullS },
 };
 

include/myisammrg.h

@@ -83,7 +83,8 @@ extern int myrg_rsame(MYRG_INFO *file,byte *record,int inx);
 extern int myrg_update(MYRG_INFO *file,const byte *old,byte *new_rec);
 extern int myrg_status(MYRG_INFO *file,MYMERGE_INFO *x,int flag);
 extern int myrg_lock_database(MYRG_INFO *file,int lock_type);
-extern int myrg_create(const char *name,const char **table_names);
+extern int myrg_create(const char *name,const char **table_names,
+		       my_bool fix_names);
 extern int myrg_extra(MYRG_INFO *file,enum ha_extra_function function);
 extern ha_rows myrg_records_in_range(MYRG_INFO *info,int inx,
 				    const byte *start_key,uint start_key_len,

include/queues.h

@@ -53,6 +53,7 @@ void delete_queue(QUEUE *queue);
 void queue_insert(QUEUE *queue,byte *element);
 byte *queue_remove(QUEUE *queue,uint idx);
 void _downheap(QUEUE *queue,uint idx);
+#define is_queue_inited(queue) ((queue)->root != 0)
 
 #ifdef	__cplusplus
 }

isam/isamlog.c

@@ -246,7 +246,7 @@ register char ***argv;
 	/* Fall through */
       case 'I':
       case '?':
-	printf("%s  Ver 3.1 for %s at %s\n",my_progname,SYSTEM_TYPE,
+	printf("%s  Ver 3.2 for %s at %s\n",my_progname,SYSTEM_TYPE,
 	       MACHINE_TYPE);
 	puts("TCX Datakonsult AB, by Monty, for your professional use\n");
 	if (version)
@@ -325,7 +325,7 @@ static int examine_log(my_string file_name, char **table_names)
 
   init_io_cache(&cache,file,0,READ_CACHE,start_offset,0,MYF(0));
   bzero((gptr) com_count,sizeof(com_count));
-  init_tree(&tree,0,sizeof(file_info),(qsort_cmp) file_info_compare,0,
+  init_tree(&tree,0,sizeof(file_info),(qsort_cmp) file_info_compare,1,
 	    (void(*)(void*)) file_info_free);
   VOID(init_key_cache(KEY_CACHE_SIZE,(uint) (10*4*(IO_SIZE+MALLOC_OVERHEAD))));
 

myisam/mi_log.c

@@ -69,7 +69,8 @@ int mi_log(int activate_log)
 	/* Logging of records and commands on logfile */
 	/* All logs starts with command(1) dfile(2) process(4) result(2) */
 
-void _myisam_log(enum myisam_log_commands command, MI_INFO *info, const byte *buffert, uint length)
+void _myisam_log(enum myisam_log_commands command, MI_INFO *info,
+		 const byte *buffert, uint length)
 {
   char buff[11];
   int error,old_errno;

myisam/mi_open.c

@@ -524,7 +524,11 @@ MI_INFO *mi_open(const char *name, int mode, uint handle_locking)
   myisam_open_list=list_add(myisam_open_list,&m_info->open_list);
 
   pthread_mutex_unlock(&THR_LOCK_myisam);
-  myisam_log(MI_LOG_OPEN,m_info,share->filename,(uint) strlen(share->filename));
+  if (myisam_log_file >= 0)
+  {
+    intern_filename(name_buff,share->filename);
+    _myisam_log(MI_LOG_OPEN,m_info,name_buff,(uint) strlen(name_buff));
+  }
   DBUG_RETURN(m_info);
 
 err:

myisam/myisamlog.c

@@ -70,7 +70,7 @@ static void printf_log(const char *str,...);
 static bool cmp_filename(struct file_info *file_info,my_string name);
 
 static uint verbose=0,update=0,test_info=0,max_files=0,re_open_count=0,
-  recover=0,prefix_remove=0;
+  recover=0,prefix_remove=0,opt_processes=0;
 static my_string log_filename=0,filepath=0,write_filename=0,record_pos_file=0;
 static ulong com_count[10][3],number_of_commands=(ulong) ~0L,
 	     isamlog_process;
@@ -199,6 +199,9 @@ static void get_options(register int *argc, register char ***argv)
 	update=1;
 	recover++;
 	break;
+      case 'P':
+	opt_processes=1;
+	break;
       case 'R':
 	if (! *++pos)
 	{
@@ -243,7 +246,7 @@ static void get_options(register int *argc, register char ***argv)
 	/* Fall through */
       case 'I':
       case '?':
-	printf("%s  Ver 1.1 for %s at %s\n",my_progname,SYSTEM_TYPE,
+	printf("%s  Ver 1.2 for %s at %s\n",my_progname,SYSTEM_TYPE,
 	       MACHINE_TYPE);
 	puts("By Monty, for your professional use\n");
 	if (version)
@@ -258,6 +261,7 @@ static void get_options(register int *argc, register char ***argv)
 	puts("         -o \"offset\"         -p # \"remove # components from path\"");
 	puts("         -r \"recover\"        -R \"file recordposition\"");
 	puts("         -u \"update\"         -v \"verbose\"   -w \"write file\"");
+	puts("         -P \"processes\"");
 	puts("\nOne can give a second and a third '-v' for more verbose.");
 	puts("Normaly one does a update (-u).");
 	puts("If a recover is done all writes and all possibly updates and deletes is done\nand errors are only counted.");
@@ -322,7 +326,7 @@ static int examine_log(my_string file_name, char **table_names)
 
   init_io_cache(&cache,file,0,READ_CACHE,start_offset,0,MYF(0));
   bzero((gptr) com_count,sizeof(com_count));
-  init_tree(&tree,0,sizeof(file_info),(qsort_cmp) file_info_compare,0,
+  init_tree(&tree,0,sizeof(file_info),(qsort_cmp) file_info_compare,1,
 	    (void(*)(void*)) file_info_free);
   VOID(init_key_cache(KEY_CACHE_SIZE,(uint) (10*4*(IO_SIZE+MALLOC_OVERHEAD))));
 
@@ -333,6 +337,8 @@ static int examine_log(my_string file_name, char **table_names)
     isamlog_filepos=my_b_tell(&cache)-9L;
     file_info.filenr= mi_uint2korr(head+1);
     isamlog_process=file_info.process=(long) mi_uint4korr(head+3);
+    if (!opt_processes)
+      file_info.process=0;
     result= mi_uint2korr(head+7);
     if ((curr_file_info=(struct file_info*) tree_search(&tree,&file_info)))
     {
@@ -374,11 +380,17 @@ static int examine_log(my_string file_name, char **table_names)
 	goto err;
       {
 	uint i;
-	char *pos=file_info.name,*to;
+	char *pos,*to;
+
+	/* Fix if old DOS files to new format */
+	for (pos=file_info.name; pos=strchr(pos,'\\') ; pos++)
+	  *pos= '/';
+
+ 	pos=file_info.name;
 	for (i=0 ; i < prefix_remove ; i++)
 	{
 	  char *next;
-	  if (!(next=strchr(pos,FN_LIBCHAR)))
+	  if (!(next=strchr(pos,'/')))
 	    break;
 	  pos=next+1;
 	}
@@ -436,7 +448,7 @@ static int examine_log(my_string file_name, char **table_names)
       if (file_info.used)
       {
 	if (verbose && !record_pos_file)
-	  printf_log("%s: open",file_info.show_name);
+	  printf_log("%s: open -> %d",file_info.show_name, file_info.filenr);
 	com_count[command][0]++;
 	if (result)
 	  com_count[command][1]++;

myisammrg/mymrgdef.h

@@ -29,4 +29,4 @@ extern pthread_mutex_t THR_LOCK_open;
 #endif
 
 int _myrg_init_queue(MYRG_INFO *info,int inx,enum ha_rkey_function search_flag);
-
+int _myrg_finish_scan(MYRG_INFO *info, int inx, enum ha_rkey_function type);

myisammrg/myrg_create.c

@@ -23,8 +23,7 @@
 	   a NULL-pointer last
 	   */
 
-int myrg_create(name,table_names)
-const char *name,**table_names;
+int myrg_create(const char *name, const char **table_names, my_bool fix_names)
 {
   int save_errno;
   uint errpos;
@@ -38,15 +37,19 @@ const char *name,**table_names;
     goto err;
   errpos=1;
   if (table_names)
+  {
     for ( ; *table_names ; table_names++)
     {
       strmov(buff,*table_names);
+      if (fix_names)
 	fn_same(buff,name,4);
       *(end=strend(buff))='\n';
-      if (my_write(file,*table_names,(uint) (end-buff+1),
+      end[1]=0;
+      if (my_write(file,buff,(uint) (end-buff+1),
 		   MYF(MY_WME | MY_NABP)))
 	goto err;
     }
+  }
   if (my_close(file,MYF(0)))
     goto err;
   DBUG_RETURN(0);

myisammrg/myrg_open.c

@@ -58,7 +58,7 @@ int handle_locking;
   {
     if ((end=strend(buff))[-1] == '\n')
       end[-1]='\0';
-    if (buff[0])		/* Skipp empty lines */
+    if (buff[0] && buff[0] != '#')	/* Skipp empty lines and comments */
     {
       last_isam=isam;
       if (!test_if_hard_path(buff))
@@ -93,7 +93,7 @@ int handle_locking;
     m_info->options|=isam->s->options;
     m_info->records+=isam->state->records;
     m_info->del+=isam->state->del;
-    m_info->data_file_length=isam->state->data_file_length;
+    m_info->data_file_length+=isam->state->data_file_length;
     if (i)
       isam=(MI_INFO*) (isam->open_list.next->data);
   }

myisammrg/myrg_queue.c

@@ -23,31 +23,32 @@ static int queue_key_cmp(void *keyseg, byte *a, byte *b)
   MI_INFO *aa=((MYRG_TABLE *)a)->table;
   MI_INFO *bb=((MYRG_TABLE *)b)->table;
   uint not_used;
-
-  return (_mi_key_cmp((MI_KEYSEG *)keyseg, aa->lastkey, bb->lastkey,
-                      USE_WHOLE_KEY, SEARCH_FIND, &not_used));
+  int ret= _mi_key_cmp((MI_KEYSEG *)keyseg, aa->lastkey, bb->lastkey,
+		       USE_WHOLE_KEY, SEARCH_FIND, &not_used);
+  return ret < 0 ? -1 : ret > 0 ? 1 : 0;
 } /* queue_key_cmp */
 
+
 int _myrg_init_queue(MYRG_INFO *info,int inx,enum ha_rkey_function search_flag)
 {
-  QUEUE *q=&(info->by_key);
+  int error=0;
+  QUEUE *q= &(info->by_key);
 
-  if (!q->root)
+  if (!is_queue_inited(q))
   {
     if (init_queue(q,info->tables, 0,
-                   (myisam_read_vec[search_flag]==SEARCH_SMALLER),
+                   (myisam_readnext_vec[search_flag] == SEARCH_SMALLER),
                    queue_key_cmp,
                    info->open_tables->table->s->keyinfo[inx].seg))
-      return my_errno;
+      error=my_errno;
   }
   else
   {
     if (reinit_queue(q,info->tables, 0,
-                     (myisam_read_vec[search_flag]==SEARCH_SMALLER),
+                     (myisam_readnext_vec[search_flag] == SEARCH_SMALLER),
                      queue_key_cmp,
                      info->open_tables->table->s->keyinfo[inx].seg))
-      return my_errno;
+      error=my_errno;
   }
-  return 0;
+  return error;
 }
-

myisammrg/myrg_rfirst.c

@@ -16,7 +16,7 @@
 
 #include "mymrgdef.h"
 
-	/*  Read first row through  a specfic key */
+	/*  Read first row according to specific key */
 
 int myrg_rfirst(MYRG_INFO *info, byte *buf, int inx)
 {
@@ -29,17 +29,17 @@ int myrg_rfirst(MYRG_INFO *info, byte *buf, int inx)
 
   for (table=info->open_tables ; table < info->end_table ; table++)
   {
-    err=mi_rfirst(table->table,NULL,inx);
-    info->last_used_table=table;
-
+    if ((err=mi_rfirst(table->table,NULL,inx)))
+    {
       if (err == HA_ERR_END_OF_FILE)
 	continue;
-    if (err)
       return err;
-
+    }
     /* adding to queue */
     queue_insert(&(info->by_key),(byte *)table);
   }
+  /* We have done a read in all tables */
+  info->last_used_table=table;
 
   if (!info->by_key.elements)
     return HA_ERR_END_OF_FILE;

myisammrg/myrg_rkey.c

@@ -16,6 +16,17 @@
 
 /* Read record based on a key */
 
+/*
+ *    HA_READ_KEY_EXACT   => SEARCH_BIGGER
+ *    HA_READ_KEY_OR_NEXT => SEARCH_BIGGER
+ *    HA_READ_AFTER_KEY   => SEARCH_BIGGER
+ *    HA_READ_PREFIX      => SEARCH_BIGGER
+ *    HA_READ_KEY_OR_PREV => SEARCH_SMALLER
+ *    HA_READ_BEFORE_KEY  => SEARCH_SMALLER
+ *    HA_READ_PREFIX_LAST => SEARCH_SMALLER
+ */
+
+
 #include "mymrgdef.h"
 
 /* todo: we could store some additional info to speedup lookups:
@@ -33,7 +44,7 @@ int myrg_rkey(MYRG_INFO *info,byte *record,int inx, const byte *key,
   MYRG_TABLE *table;
   MI_INFO *mi;
   int err;
-  byte *buf=((search_flag == HA_READ_KEY_EXACT)?record:0);
+  byte *buf=((search_flag == HA_READ_KEY_EXACT) ? record: 0);
 
   if (_myrg_init_queue(info,inx,search_flag))
     return my_errno;
@@ -52,13 +63,14 @@ int myrg_rkey(MYRG_INFO *info,byte *record,int inx, const byte *key,
     {
       err=_mi_rkey(mi,buf,inx,key_buff,pack_key_length,search_flag,FALSE);
     }
-    info->last_used_table=table;
+    info->last_used_table=table+1;
 
+    if (err)
+    {
       if (err == HA_ERR_KEY_NOT_FOUND)
 	continue;
-    if (err)
       return err;
-
+    }
     /* adding to queue */
     queue_insert(&(info->by_key),(byte *)table);
 
@@ -76,14 +88,3 @@ int myrg_rkey(MYRG_INFO *info,byte *record,int inx, const byte *key,
   mi=(info->current_table=(MYRG_TABLE *)queue_top(&(info->by_key)))->table;
   return mi_rrnd(mi,record,mi->lastpos);
 }
-
-/*
- *    HA_READ_KEY_EXACT   => SEARCH_BIGGER
- *    HA_READ_KEY_OR_NEXT => SEARCH_BIGGER
- *    HA_READ_AFTER_KEY   => SEARCH_BIGGER
- *    HA_READ_PREFIX      => SEARCH_BIGGER
- *    HA_READ_KEY_OR_PREV => SEARCH_SMALLER
- *    HA_READ_BEFORE_KEY  => SEARCH_SMALLER
- *    HA_READ_PREFIX_LAST => SEARCH_SMALLER
- */
-

myisammrg/myrg_rlast.c

@@ -24,22 +24,22 @@ int myrg_rlast(MYRG_INFO *info, byte *buf, int inx)
   MI_INFO *mi;
   int err;
 
-  if (_myrg_init_queue(info,inx,HA_READ_KEY_OR_PREV))
+  if (_myrg_init_queue(info,inx, HA_READ_KEY_OR_PREV))
     return my_errno;
 
   for (table=info->open_tables ; table < info->end_table ; table++)
   {
-    err=mi_rlast(table->table,NULL,inx);
-    info->last_used_table=table;
-
+    if ((err=mi_rlast(table->table,NULL,inx)))
+    {
       if (err == HA_ERR_END_OF_FILE)
 	continue;
-    if (err)
       return err;
-
+    }
     /* adding to queue */
     queue_insert(&(info->by_key),(byte *)table);
   }
+  /* We have done a read in all tables */
+  info->last_used_table=table;
 
   if (!info->by_key.elements)
     return HA_ERR_END_OF_FILE;

myisammrg/myrg_rnext.c

@@ -22,22 +22,21 @@
 
 int myrg_rnext(MYRG_INFO *info, byte *buf, int inx)
 {
-  MYRG_TABLE *table;
-  MI_INFO *mi;
-  byte *key_buff;
-  uint pack_key_length;
   int err;
+  MI_INFO *mi;
 
   /* at first, do rnext for the table found before */
-  err=mi_rnext(info->current_table->table,NULL,inx);
+  if ((err=mi_rnext(info->current_table->table,NULL,inx)))
+  {
     if (err == HA_ERR_END_OF_FILE)
     {
       queue_remove(&(info->by_key),0);
       if (!info->by_key.elements)
 	return HA_ERR_END_OF_FILE;
     }
-  else if (err)
+    else
       return err;
+  }
   else
   {
     /* Found here, adding to queue */
@@ -46,30 +45,42 @@ int myrg_rnext(MYRG_INFO *info, byte *buf, int inx)
   }
 
   /* next, let's finish myrg_rkey's initial scan */
-  table=info->last_used_table+1;
+  if ((err=_myrg_finish_scan(info, inx, HA_READ_KEY_OR_NEXT)))
+    return err;
+
+  /* now, mymerge's read_next is as simple as one queue_top */
+  mi=(info->current_table=(MYRG_TABLE *)queue_top(&(info->by_key)))->table;
+  return mi_rrnd(mi,buf,mi->lastpos);
+}
+
+
+/* let's finish myrg_rkey's initial scan */
+
+int _myrg_finish_scan(MYRG_INFO *info, int inx, enum ha_rkey_function type)
+{
+  int err;
+  MYRG_TABLE *table=info->last_used_table;
   if (table < info->end_table)
   {
-    mi=info->last_used_table->table;
-    key_buff=(byte*) mi->lastkey+mi->s->base.max_key_length;
-    pack_key_length=mi->last_rkey_length;
+    MI_INFO *mi= table[-1].table;
+    byte *key_buff=(byte*) mi->lastkey+mi->s->base.max_key_length;
+    uint pack_key_length=  mi->last_rkey_length;
+
     for (; table < info->end_table ; table++)
     {
       mi=table->table;
-      err=_mi_rkey(mi,NULL,inx,key_buff,pack_key_length,HA_READ_KEY_OR_NEXT,FALSE);
-      info->last_used_table=table;
-
-      if (err == HA_ERR_KEY_NOT_FOUND)
+      if ((err=_mi_rkey(mi,NULL,inx,key_buff,pack_key_length,
+			type,FALSE)))
+      {
+	if (err == HA_ERR_KEY_NOT_FOUND)	/* If end of file */
 	  continue;
-      if (err)
 	return err;
-
+      }
       /* Found here, adding to queue */
-      queue_insert(&(info->by_key),(byte *)table);
+      queue_insert(&(info->by_key),(byte *) table);
     }
+    /* All tables are now used */
+    info->last_used_table=table;
   }
-
-  /* now, mymerge's read_next is as simple as one queue_top */
-  mi=(info->current_table=(MYRG_TABLE *)queue_top(&(info->by_key)))->table;
-  return mi_rrnd(mi,buf,mi->lastpos);
+  return 0;
 }
-

myisammrg/myrg_rprev.c

@@ -22,22 +22,21 @@
 
 int myrg_rprev(MYRG_INFO *info, byte *buf, int inx)
 {
-  MYRG_TABLE *table;
-  MI_INFO *mi;
-  byte *key_buff;
-  uint pack_key_length;
   int err;
+  MI_INFO *mi;
 
-  /* at first, do rnext for the table found before */
-  err=mi_rprev(info->current_table->table,NULL,inx);
+  /* at first, do rprev for the table found before */
+  if ((err=mi_rprev(info->current_table->table,NULL,inx)))
+  {
     if (err == HA_ERR_END_OF_FILE)
     {
       queue_remove(&(info->by_key),0);
       if (!info->by_key.elements)
 	return HA_ERR_END_OF_FILE;
     }
-  else if (err)
+    else
       return err;
+  }
   else
   {
     /* Found here, adding to queue */
@@ -46,29 +45,9 @@ int myrg_rprev(MYRG_INFO *info, byte *buf, int inx)
   }
 
   /* next, let's finish myrg_rkey's initial scan */
-  table=info->last_used_table+1;
-  if (table < info->end_table)
-  {
-    mi=info->last_used_table->table;
-    key_buff=(byte*) mi->lastkey+mi->s->base.max_key_length;
-    pack_key_length=mi->last_rkey_length;
-    for (; table < info->end_table ; table++)
-    {
-      mi=table->table;
-      err=_mi_rkey(mi,NULL,inx,key_buff,pack_key_length,
-		   HA_READ_KEY_OR_PREV,FALSE);
-      info->last_used_table=table;
-
-      if (err == HA_ERR_KEY_NOT_FOUND)
-        continue;
-      if (err)
+  if ((err=_myrg_finish_scan(info, inx, HA_READ_KEY_OR_PREV)))
     return err;
 
-      /* Found here, adding to queue */
-      queue_insert(&(info->by_key),(byte *)table);
-    }
-  }
-
   /* now, mymerge's read_prev is as simple as one queue_top */
   mi=(info->current_table=(MYRG_TABLE *)queue_top(&(info->by_key)))->table;
   return mi_rrnd(mi,buf,mi->lastpos);

myisammrg/myrg_rrnd.c

@@ -84,9 +84,9 @@ int myrg_rrnd(MYRG_INFO *info,byte *buf,ulonglong filepos)
 				 info->end_table-1,filepos);
   isam_info=info->current_table->table;
   isam_info->update&= HA_STATE_CHANGED;
-  return ((*isam_info->s->read_rnd)(isam_info,(byte*) buf,
-				    (ha_rows) (filepos -
-					       info->current_table->file_offset),
+  return ((*isam_info->s->read_rnd)
+	  (isam_info, (byte*) buf,
+	   (ha_rows) (filepos - info->current_table->file_offset),
 	   0));
 }
 

mysys/queues.c

@@ -25,7 +25,7 @@
 #include <queues.h>
 
 
-	/* The actuall code for handling queues */
+/* Init queue */
 
 int init_queue(QUEUE *queue, uint max_elements, uint offset_to_key,
 	       pbool max_at_top, int (*compare) (void *, byte *, byte *),
@@ -44,6 +44,12 @@ int init_queue(QUEUE *queue, uint max_elements, uint offset_to_key,
   DBUG_RETURN(0);
 }
 
+/*
+  Reinitialize queue for new usage;  Note that you can't currently resize
+  the number of elements!  If you need this, fix it :)
+*/
+
+
 int reinit_queue(QUEUE *queue, uint max_elements, uint offset_to_key,
                pbool max_at_top, int (*compare) (void *, byte *, byte *),
                void *first_cmp_arg)
@@ -78,6 +84,7 @@ void delete_queue(QUEUE *queue)
 void queue_insert(register QUEUE *queue, byte *element)
 {
   reg2 uint idx,next;
+  int cmp;
 
 #ifndef DBUG_OFF
   if (queue->elements < queue->max_elements)
@@ -86,10 +93,12 @@ void queue_insert(register QUEUE *queue, byte *element)
     queue->root[0]=element;
     idx= ++queue->elements;
 
-    while ((queue->compare(queue->first_cmp_arg,
+    /* max_at_top swaps the comparison if we want to order by desc */
+    while ((cmp=queue->compare(queue->first_cmp_arg,
 			       element+queue->offset_to_key,
-			   queue->root[(next=idx >> 1)]+queue->offset_to_key)
-	    ^ queue->max_at_top) < 0)
+			       queue->root[(next=idx >> 1)] +
+			       queue->offset_to_key)) &&
+	   (cmp ^ queue->max_at_top) < 0)
     {
       queue->root[idx]=queue->root[next];
       idx=next;

sql-bench/test-insert.sh

@@ -348,12 +348,12 @@ print " for select_diff_key ($count:$rows): " .
 # Test select that is very popular when using ODBC
 
 check_or_range("id","select_range_prefix");
-check_or_range("id3","select_range");
+check_or_range("id3","select_range_key2");
 
 # Check reading on direct key on id and id3
 
 check_select_key("id","select_key_prefix");
-check_select_key("id3","select_key");
+check_select_key("id3","select_key_key2");
 
 ####
 #### A lot of simple selects on ranges
@@ -403,7 +403,7 @@ check_select_key("id3","select_key");
 
 print "\nTest of compares with simple ranges\n";
 check_select_range("id","select_range_prefix");
-check_select_range("id3","select_range");
+check_select_range("id3","select_range_key2");
 
 ####
 #### Some group queries
@@ -1107,20 +1107,28 @@ if ($server->small_rollback_segment())
 # Delete everything from table
 #
 
-print "Deleting everything from table\n";
+print "Deleting rows from the table\n";
 $loop_time=new Benchmark;
 $count=0;
+
+for ($i=0 ; $i < 128 ; $i++)
+{
+  $dbh->do("delete from bench1 where field1 = $i") or die $DBI::errstr;
+}
+
+$end_time=new Benchmark;
+print "Time for delete_big_many_keys ($count): " .
+timestr(timediff($end_time, $loop_time),"all") . "\n\n";
+
+print "Deleting everything from table\n";
+$count=1;
 if ($opt_fast)
 {
-  $dbh->do("delete from bench1 where field1 = 0") or die $DBI::errstr;
   $dbh->do("delete from bench1") or die $DBI::errstr;
-  $count+=2;
 }
 else
 {
-  $dbh->do("delete from bench1 where field1 = 0") or die $DBI::errstr;
   $dbh->do("delete from bench1 where field1 > 0") or die $DBI::errstr;
-  $count+=2;
 }
 
 if ($opt_lock_tables)
@@ -1129,7 +1137,7 @@ if ($opt_lock_tables)
 }
 
 $end_time=new Benchmark;
-print "Time for delete_big_many_keys ($count): " .
+print "Time for delete_all_many_keys ($count): " .
   timestr(timediff($end_time, $loop_time),"all") . "\n\n";
 
 $sth = $dbh->do("drop table bench1") or die $DBI::errstr;

sql/ha_heap.cc

@@ -261,7 +261,7 @@ ha_rows ha_heap::records_in_range(int inx,
   if (start_key_len != end_key_len ||
       start_key_len != pos->key_length ||
       start_search_flag != HA_READ_KEY_EXACT ||
-      end_search_flag != HA_READ_KEY_EXACT)
+      end_search_flag != HA_READ_AFTER_KEY)
     return HA_POS_ERROR;			// Can't only use exact keys
   return 10;					// Good guess
 }

sql/ha_heap.h

@@ -33,14 +33,15 @@ class ha_heap: public handler
   const char *table_type() const { return "HEAP"; }
   const char **bas_ext() const;
   ulong option_flag() const
-  { return (HA_READ_RND_SAME+HA_NO_INDEX+HA_BINARY_KEYS+HA_WRONG_ASCII_ORDER+
-	    HA_KEYPOS_TO_RNDPOS+HA_NO_BLOBS+HA_REC_NOT_IN_SEQ); }
+  { return (HA_READ_RND_SAME | HA_NO_INDEX | HA_ONLY_WHOLE_INDEX | 
+	    HA_WRONG_ASCII_ORDER | HA_KEYPOS_TO_RNDPOS | HA_NO_BLOBS |
+	    HA_REC_NOT_IN_SEQ); }
   uint max_record_length() const { return HA_MAX_REC_LENGTH; }
   uint max_keys()          const { return MAX_KEY; }
   uint max_key_parts()     const { return MAX_REF_PARTS; }
   uint max_key_length()    const { return HA_MAX_REC_LENGTH; }
-  virtual double scan_time() { return (double) (records+deleted) / 100.0; }
-  virtual double read_time(ha_rows rows) { return (double) rows / 100.0; }
+  virtual double scan_time() { return (double) (records+deleted) / 20.0+10; }
+  virtual double read_time(ha_rows rows) { return (double) rows /  20.0+1; }
   virtual bool fast_key_read() { return 1;}
 
   int open(const char *name, int mode, int test_if_locked);

sql/ha_myisam.h

@@ -45,7 +45,7 @@ class ha_myisam: public handler
   const char **bas_ext() const;
   ulong option_flag() const { return int_option_flag; }
   uint max_record_length() const { return HA_MAX_REC_LENGTH; }
-  uint max_keys()          const { return 1; }
+  uint max_keys()          const { return MI_MAX_KEY; }
   uint max_key_parts()     const { return MAX_REF_PARTS; }
   uint max_key_length()    const { return MAX_KEY_LENGTH; }
 

sql/ha_myisammrg.cc

@@ -180,11 +180,7 @@ void ha_myisammrg::info(uint flag)
   mean_rec_length=info.reclength;
   block_size=0;
   update_time=0;
-#if SIZEOF_OFF_T > 4
   ref_length=6;					// Should be big enough
-#else
-  ref_length=4;
-#endif
 }
 
 
@@ -228,6 +224,16 @@ THR_LOCK_DATA **ha_myisammrg::store_lock(THD *thd,
 int ha_myisammrg::create(const char *name, register TABLE *form,
 			 HA_CREATE_INFO *create_info)
 {
-  char buff[FN_REFLEN];
-  return myrg_create(fn_format(buff,name,"","",2+4+16),0);
+  char buff[FN_REFLEN],**table_names,**pos;
+  TABLE_LIST *tables= (TABLE_LIST*) create_info->merge_list.first;
+  DBUG_ENTER("ha_myisammrg::create");
+
+  if (!(table_names= (char**) sql_alloc((create_info->merge_list.elements+1)*
+					sizeof(char*))))
+    DBUG_RETURN(1);
+  for (pos=table_names ; tables ; tables=tables->next)
+    *pos++= tables->real_name;
+  *pos=0;
+  DBUG_RETURN(myrg_create(fn_format(buff,name,"","",2+4+16),
+			  (const char **) table_names, (my_bool) 0));
 }

sql/ha_myisammrg.h

@@ -32,15 +32,19 @@ class ha_myisammrg: public handler
   ~ha_myisammrg() {}
   const char *table_type() const { return "MRG_MyISAM"; }
   const char **bas_ext() const;
-  ulong option_flag() const { return HA_REC_NOT_IN_SEQ+HA_READ_NEXT+
-                                     HA_READ_PREV+HA_READ_RND_SAME+HA_HAVE_KEY_READ_ONLY+
-		                     HA_KEYPOS_TO_RNDPOS+HA_READ_ORDER+
-		                     HA_LASTKEY_ORDER+HA_READ_NOT_EXACT_KEY+
-		                     HA_LONGLONG_KEYS+HA_NULL_KEY+HA_BLOB_KEY; }
+  ulong option_flag() const
+    { return (HA_REC_NOT_IN_SEQ | HA_READ_NEXT | 
+	      HA_READ_PREV | HA_READ_RND_SAME | 
+	      HA_HAVE_KEY_READ_ONLY | 
+	      HA_KEYPOS_TO_RNDPOS | HA_READ_ORDER | 
+	      HA_LASTKEY_ORDER | HA_READ_NOT_EXACT_KEY | 
+	      HA_LONGLONG_KEYS | HA_NULL_KEY | HA_BLOB_KEY); }
   uint max_record_length() const { return HA_MAX_REC_LENGTH; }
-  uint max_keys()          const { return 1; }
+  uint max_keys()          const { return MI_MAX_KEY; }
   uint max_key_parts()     const { return MAX_REF_PARTS; }
   uint max_key_length()    const { return MAX_KEY_LENGTH; }
+  virtual double scan_time()
+    { return ulonglong2double(data_file_length) / IO_SIZE + file->tables; }
 
   int open(const char *name, int mode, int test_if_locked);
   int close(void);

sql/handler.h

@@ -47,7 +47,7 @@
 					  if database is updated after read) */
 #define HA_REC_NOT_IN_SEQ	64	/* ha_info don't return recnumber;
 					   It returns a position to ha_r_rnd */
-#define HA_BINARY_KEYS		128	/* Keys must be exact */
+#define HA_ONLY_WHOLE_INDEX	128	/* Can't use part key searches */
 #define HA_RSAME_NO_INDEX	256	/* RSAME can't restore index */
 #define HA_WRONG_ASCII_ORDER	512	/* Can't use sorting through key */
 #define HA_HAVE_KEY_READ_ONLY	1024	/* Can read only keys (no record) */
@@ -127,6 +127,7 @@ typedef struct st_ha_create_information
   ulong raid_chunksize;
   bool if_not_exists;
   ulong used_fields;
+  SQL_LIST merge_list;
 } HA_CREATE_INFO;
 
 

sql/lex.h

@@ -297,11 +297,12 @@ static SYMBOL symbols[] = {
   { "TRAILING",		SYM(TRAILING),0,0},
   { "TO",		SYM(TO_SYM),0,0},
   { "TYPE",		SYM(TYPE_SYM),0,0},
-  { "USE",		SYM(USE_SYM),0,0},
-  { "USING",		SYM(USING),0,0},
+  { "UNION",	        SYM(UNION_SYM),0,0},
   { "UNIQUE",		SYM(UNIQUE_SYM),0,0},
   { "UNLOCK",		SYM(UNLOCK_SYM),0,0},
   { "UNSIGNED",		SYM(UNSIGNED),0,0},
+  { "USE",		SYM(USE_SYM),0,0},
+  { "USING",		SYM(USING),0,0},
   { "UPDATE",		SYM(UPDATE_SYM),0,0},
   { "USAGE",		SYM(USAGE),0,0},
   { "VALUES",		SYM(VALUES),0,0},

sql/mysql_priv.h

@@ -79,6 +79,10 @@ void sql_element_free(void *ptr);
 // instead of reading with keys.  The number says how many evaluation of the
 // WHERE clause is comparable to reading one extra row from a table.
 #define TIME_FOR_COMPARE   5	// 5 compares == one read
+// Number of rows in a reference table when refereed through a not unique key.
+// This value is only used when we don't know anything about the key
+// distribution.
+#define MATCHING_ROWS_IN_OTHER_TABLE 10	
 
 /* Don't pack string keys shorter than this (if PACK_KEYS=1 isn't used) */
 #define KEY_DEFAULT_PACK_LENGTH 8

sql/sql_acl.cc

@@ -1905,6 +1905,7 @@ int  grant_init (void)
   {
     t_table->file->index_end();
     mysql_unlock_tables(thd, lock);
+    thd->version--;				// Force close to free memory
     close_thread_tables(thd);
     delete thd;
     DBUG_RETURN(0);				// Empty table is ok!

sql/sql_lex.h

@@ -94,16 +94,9 @@ typedef struct st_lex {
   LEX_YYSTYPE yylval;
   uchar *ptr,*tok_start,*tok_end,*end_of_query;
   ha_rows select_limit,offset_limit;
-  bool	 create_refs,drop_primary,drop_if_exists,local_file,
-	 in_comment,ignore_space,verbose;
-  enum_sql_command sql_command;
-  enum lex_states next_state;
-  ulong options;
-  uint in_sum_expr,grant,grant_tot_col,which_columns, sort_default;
   char *length,*dec,*change,*name;
   String *wild;
   sql_exchange *exchange;
-  thr_lock_type lock_option;
 
   List<List_item>     expr_list;
   List<List_item>     when_list;
@@ -124,9 +117,6 @@ typedef struct st_lex {
   create_field	      *last_field;
 
   Item *where,*having,*default_value;
-  enum enum_duplicates duplicates;
-  ulong thread_id,type;
-  HA_CREATE_INFO create_info;
   CONVERT *convert_set;
   LEX_USER *grant_user;
   char *db,*db1,*table1,*db2,*table2;		/* For outer join using .. */
@@ -134,7 +124,18 @@ typedef struct st_lex {
   THD *thd;
   udf_func udf;
   HA_CHECK_OPT   check_opt;			// check/repair options
+  HA_CREATE_INFO create_info;
   LEX_MASTER_INFO mi;				// used by CHANGE MASTER 
+  ulong thread_id,type;
+  ulong options;
+  enum_sql_command sql_command;
+  enum lex_states next_state;
+  enum enum_duplicates duplicates;
+  uint in_sum_expr,grant,grant_tot_col,which_columns, sort_default;
+  thr_lock_type lock_option;
+  bool	create_refs,drop_primary,drop_if_exists,local_file;
+  bool  in_comment,ignore_space,verbose;
+
 } LEX;
 
 

sql/sql_parse.cc

@@ -38,8 +38,9 @@ extern "C" pthread_mutex_t THR_LOCK_keycache;
 extern "C" int gethostname(char *name, int namelen);
 #endif
 
-static bool check_table_access(THD *thd,uint want_access,TABLE_LIST *tables);
+static bool check_table_access(THD *thd,uint want_access, TABLE_LIST *tables);
 static bool check_db_used(THD *thd,TABLE_LIST *tables);
+static bool check_merge_table_access(THD *thd, char *db, TABLE_LIST *tables);
 static bool check_dup(THD *thd,const char *db,const char *name,
 		      TABLE_LIST *tables);
 static void mysql_init_query(THD *thd);
@@ -504,9 +505,9 @@ int mysql_table_dump(THD* thd, char* db, char* tbl_name, int fd)
   if(!(table=open_ltable(thd, table_list, TL_READ_NO_INSERT)))
     DBUG_RETURN(1);
 
-  if(check_access(thd, SELECT_ACL, db, &table_list->grant.privilege))
+  if (check_access(thd, SELECT_ACL, db, &table_list->grant.privilege))
     goto err;
-  if(grant_option && check_grant(thd, SELECT_ACL, table_list))
+  if (grant_option && check_grant(thd, SELECT_ACL, table_list))
     goto err;
 
   thd->free_list = 0;
@@ -988,10 +989,12 @@ mysql_execute_command(void)
     break;
 
   case SQLCOM_CREATE_TABLE:
-#ifdef DEMO_VERSION
-    send_error(&thd->net,ER_NOT_ALLOWED_COMMAND);
-#else
-    if (check_access(thd,CREATE_ACL,tables->db,&tables->grant.privilege))
+    if (!tables->db)
+      tables->db=thd->db;
+    if (check_access(thd,CREATE_ACL,tables->db,&tables->grant.privilege) ||
+	check_merge_table_access(thd, tables->db,
+				 (TABLE_LIST *)
+				 lex->create_info.merge_list.first))
       goto error;				/* purecov: inspected */
     if (grant_option)
     {
@@ -1072,7 +1075,6 @@ mysql_execute_command(void)
     if (grant_option && check_grant(thd,INDEX_ACL,tables))
       goto error;
     res = mysql_create_index(thd, tables, lex->key_list);
-#endif
     break;
 
   case SQLCOM_SLAVE_START:
@@ -1082,7 +1084,6 @@ mysql_execute_command(void)
     stop_slave(thd);
     break;
 
-
   case SQLCOM_ALTER_TABLE:
 #if defined(DONT_ALLOW_SHOW_COMMANDS)
     send_error(&thd->net,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
@@ -1096,10 +1097,15 @@ mysql_execute_command(void)
 	res=0;
 	break;
       }
+      if (!tables->db)
+	tables->db=thd->db;
       if (!lex->db)
 	lex->db=tables->db;
       if (check_access(thd,ALTER_ACL,tables->db,&tables->grant.privilege) ||
-	  check_access(thd,INSERT_ACL | CREATE_ACL,lex->db,&priv))
+	  check_access(thd,INSERT_ACL | CREATE_ACL,lex->db,&priv) ||
+	  check_merge_table_access(thd, tables->db, 
+				   (TABLE_LIST *)
+				   lex->create_info.merge_list.first))
 	goto error;				/* purecov: inspected */
       if (!tables->db)
 	tables->db=thd->db;
@@ -1354,7 +1360,7 @@ mysql_execute_command(void)
     res = mysql_drop_index(thd, tables, lex->drop_list);
     break;
   case SQLCOM_SHOW_DATABASES:
-#if defined(DONT_ALLOW_SHOW_COMMANDS) || defined(DEMO_VERSION)
+#if defined(DONT_ALLOW_SHOW_COMMANDS)
     send_error(&thd->net,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
     DBUG_VOID_RETURN;
 #else
@@ -1810,6 +1816,22 @@ static bool check_db_used(THD *thd,TABLE_LIST *tables)
 }
 
 
+static bool check_merge_table_access(THD *thd, char *db, TABLE_LIST *table_list)
+{
+  int error=0;
+  if (table_list)
+  {
+    /* Force all tables to use the current database */
+    TABLE_LIST *tmp;
+    for (tmp=table_list; tmp ; tmp=tmp->next)
+      tmp->db=db;
+    error=check_table_access(thd, SELECT_ACL | UPDATE_ACL | DELETE_ACL,
+			     table_list);
+  }
+  return error;
+}
+
+
 /****************************************************************************
 	Check stack size; Send error if there isn't enough stack to continue
 ****************************************************************************/
@@ -2462,7 +2484,7 @@ static int start_slave(THD* thd , bool net_report)
   if(!thd) thd = current_thd;
   NET* net = &thd->net;
   const char* err = 0;
-  if(check_access(thd, PROCESS_ACL, any_db))
+  if (check_access(thd, PROCESS_ACL, any_db))
     return 1;
   pthread_mutex_lock(&LOCK_slave);
   if(!slave_running)
@@ -2497,7 +2519,7 @@ static int stop_slave(THD* thd, bool net_report )
   NET* net = &thd->net;
   const char* err = 0;
 
-  if(check_access(thd, PROCESS_ACL, any_db))
+  if (check_access(thd, PROCESS_ACL, any_db))
     return 1;
 
   pthread_mutex_lock(&LOCK_slave);

sql/sql_select.cc

@@ -942,7 +942,7 @@ make_join_statistics(JOIN *join,TABLE_LIST *tables,COND *conds,
     }
     /* Approximate found rows and time to read them */
     s->found_records=s->records=s->table->file->records;
-    s->read_time=(ha_rows) ((s->table->file->data_file_length)/IO_SIZE)+1;
+    s->read_time=(ha_rows) s->table->file->scan_time();
 
     /* Set a max range of how many seeks we can expect when using keys */
     s->worst_seeks= (double) (s->read_time*2);
@@ -1419,7 +1419,7 @@ update_ref_and_keys(DYNAMIC_ARRAY *keyuse,JOIN_TAB *join_tab,uint tables,
     for (i=0 ; i < keyuse->elements-1 ; i++,use++)
     {
       if (!use->used_tables)
-	use->table->const_key_parts[use->key]|=
+	use->table->const_key_parts[use->key] |=
 	  (key_part_map) 1 << use->keypart;
       if (use->keypart != FT_KEYPART)
       {
@@ -1532,7 +1532,7 @@ find_best(JOIN *join,table_map rest_tables,uint idx,double record_count,
 	double best_records=DBL_MAX;
 
 	/* Test how we can use keys */
-	rec= s->records/10;			/* Assume 10 records/key */
+	rec= s->records/MATCHING_ROWS_IN_OTHER_TABLE;  /* Assumed records/key */
 	for (keyuse=s->keyuse ; keyuse->table == table ;)
 	{
 	  key_map found_part=0;
@@ -1571,7 +1571,7 @@ find_best(JOIN *join,table_map rest_tables,uint idx,double record_count,
 		if (map == 1)			// Only one table
 		{
 		  TABLE *tmp_table=join->all_tables[tablenr];
-		  if (rec > tmp_table->file->records)
+		  if (rec > tmp_table->file->records && rec > 100)
 		    rec=max(tmp_table->file->records,100);
 		}
 	      }
@@ -1615,12 +1615,12 @@ find_best(JOIN *join,table_map rest_tables,uint idx,double record_count,
 	    }
 	    else
 	    {
-	      if (!found_ref)			// If not const key
-	      {
+	      if (!found_ref)
+	      {					// We found a const key
 		if (table->quick_keys & ((key_map) 1 << key))
 		  records= (double) table->quick_rows[key];
 		else
-		  records= (double) s->records; // quick_range couldn't use key!
+		  records= (double) s->records/rec; // quick_range couldn't use key!
 	      }
 	      else
 	      {
@@ -1654,7 +1654,8 @@ find_best(JOIN *join,table_map rest_tables,uint idx,double record_count,
 	    ** than a not unique key
 	    ** Set tmp to (previous record count) * (records / combination)
 	    */
-	    if (found_part & 1)
+	    if ((found_part & 1) &&
+		!(table->file->option_flag() & HA_ONLY_WHOLE_INDEX))
 	    {
 	      uint max_key_part=max_part_bit(found_part);
 	      /* Check if quick_range could determinate how many rows we

sql/sql_table.cc

@@ -176,7 +176,7 @@ int mysql_create_table(THD *thd,const char *db, const char *table_name,
   DBUG_ENTER("mysql_create_table");
 
   /*
-  ** Check for dupplicate fields and check type of table to create
+  ** Check for duplicate fields and check type of table to create
   */
 
   if (!fields.elements)
@@ -302,7 +302,7 @@ int mysql_create_table(THD *thd,const char *db, const char *table_name,
   bool primary_key=0,unique_key=0;
   Key *key;
   uint tmp;
-  tmp=max(file->max_keys(), MAX_KEY);
+  tmp=min(file->max_keys(), MAX_KEY);
 
   if (key_count > tmp)
   {

sql/sql_yacc.yy

@@ -262,6 +262,7 @@ bool my_yyoverflow(short **a, YYSTYPE **b,int *yystacksize);
 %token	UDF_RETURNS_SYM
 %token	UDF_SONAME_SYM
 %token	UDF_SYM
+%token	UNION_SYM
 %token	UNIQUE_SYM
 %token	USAGE
 %token	USE_SYM
@@ -712,6 +713,18 @@ create_table_option:
 	| RAID_TYPE EQ raid_types	{ Lex->create_info.raid_type= $3; Lex->create_info.used_fields|= HA_CREATE_USED_RAID;}
 	| RAID_CHUNKS EQ ULONG_NUM	{ Lex->create_info.raid_chunks= $3; Lex->create_info.used_fields|= HA_CREATE_USED_RAID;}
 	| RAID_CHUNKSIZE EQ ULONG_NUM	{ Lex->create_info.raid_chunksize= $3*RAID_BLOCK_SIZE; Lex->create_info.used_fields|= HA_CREATE_USED_RAID;}
+	| UNION_SYM EQ '(' table_list ')'
+	  {
+	    /* Move the union list to the merge_list */
+	    LEX *lex=Lex;
+	    TABLE_LIST *table_list= (TABLE_LIST*) lex->table_list.first;
+	    lex->create_info.merge_list= lex->table_list;
+	    lex->create_info.merge_list.elements--;
+	    lex->create_info.merge_list.first= (byte*) (table_list->next);
+	    lex->table_list.elements=1;
+	    lex->table_list.next= (byte**) &(table_list->next);
+	    table_list->next=0;
+	  }
 
 table_types:
 	ISAM_SYM	{ $$= DB_TYPE_ISAM; }