Added ALTER TABLE ... ORDER BY ...

Docs/manual.texi

@@ -17683,7 +17683,7 @@ using @code{myisampack}. @xref{Compressed format}.
 @section @code{ALTER TABLE} Syntax
 
 @example
-ALTER [IGNORE] TABLE tbl_name alter_spec [, alter_spec ...]
+ALTER [IGNORE] TABLE tbl_name alter_spec [, alter_spec ...] [ORDER BY col]
 
 alter_specification:
         ADD [COLUMN] create_definition [FIRST | AFTER column_name ]
@@ -17832,6 +17832,14 @@ index exists, it drops the first @code{UNIQUE} index in the table.
 (@strong{MySQL} marks the first @code{UNIQUE} key as the @code{PRIMARY KEY}
 if no @code{PRIMARY KEY} was specified explicitly.)
 
+@findex ORDER BY
+@item
+@code {ORDER BY} allows you to create the new table with the rows in a
+specific order.  Note that the table will not remain in this order after
+inserts and deletes.  In some cases, it may make sorting easier for 
+@strong{MySQL} if the table is in order by the column that you wish to
+order it by later.
+
 @findex ALTER TABLE
 @item
 If you use @code{ALTER TABLE} on a @code{MyISAM} table, all non-unique
@@ -38312,6 +38320,9 @@ a temporary table
 @item
 @code{CHANGE MASTER TO} without specifying @code{MASTER_LOG_POS} would
 set it to 0 instead of 4 and hit the magic number in the master binlog.
+@item
+@code{ALTER TABLE ... ORDER BY ...} syntax added.  This will create the 
+new table with the rows in a specific order.
 
 @end itemize
 

sql/mysql_priv.h

@@ -281,6 +281,10 @@ bool net_store_data(String *packet,const char *from,uint length);
 bool net_store_data(String *packet,struct tm *tmp);
 bool net_store_data(String* packet, I_List<i_string>* str_list);
 
+SORT_FIELD * make_unireg_sortorder(ORDER *order, uint *length);
+int setup_order(THD *thd,TABLE_LIST *tables, List<Item> &fields,
+                List <Item> &all_fields, ORDER *order);
+
 int mysql_select(THD *thd,TABLE_LIST *tables,List<Item> &list,COND *conds,
                  List<Item_func_match> &ftfuncs,
 		 ORDER *order, ORDER *group,Item *having,ORDER *proc_param,
@@ -307,6 +311,7 @@ int mysql_alter_table(THD *thd, char *new_db, char *new_name,
 		      List<create_field> &fields,
 		      List<Key> &keys,List<Alter_drop> &drop_list,
 		      List<Alter_column> &alter_list,
+                      ORDER *order,
 		      bool drop_primary,
 		      enum enum_duplicates handle_duplicates);
 bool mysql_rename_table(enum db_type base,

sql/sql_base.cc

@@ -1905,7 +1905,7 @@ int mysql_create_index(THD *thd, TABLE_LIST *table_list, List<Key> &keys)
   create_info.db_type=DB_TYPE_DEFAULT;
   DBUG_RETURN(mysql_alter_table(thd,table_list->db,table_list->real_name,
 				&create_info, table_list,
-				fields, keys, drop, alter, FALSE, DUP_ERROR));
+				fields, keys, drop, alter, (ORDER*)0, FALSE, DUP_ERROR));
 }
 
 
@@ -1920,7 +1920,7 @@ int mysql_drop_index(THD *thd, TABLE_LIST *table_list, List<Alter_drop> &drop)
   create_info.db_type=DB_TYPE_DEFAULT;
   DBUG_RETURN(mysql_alter_table(thd,table_list->db,table_list->real_name,
 				&create_info, table_list,
-				fields, keys, drop, alter, FALSE, DUP_ERROR));
+				fields, keys, drop, alter, (ORDER*)0, FALSE, DUP_ERROR));
 }
 
 /*****************************************************************************

sql/sql_parse.cc

@@ -1158,6 +1158,7 @@ mysql_execute_command(void)
 			       &lex->create_info,
 			       tables, lex->create_list,
 			       lex->key_list, lex->drop_list, lex->alter_list,
+                               (ORDER *) lex->order_list.first,
 			       lex->drop_primary, lex->duplicates);
       break;
     }
@@ -1262,6 +1263,7 @@ mysql_execute_command(void)
       res= mysql_alter_table(thd, NullS, NullS, &create_info,
 			     tables, lex->create_list,
 			     lex->key_list, lex->drop_list, lex->alter_list,
+                             (ORDER *) 0,
 			     0,DUP_ERROR);
     }
     else

sql/sql_select.cc

@@ -112,15 +112,12 @@ static int remove_dup_with_compare(THD *thd, TABLE *entry, Field **field,
 static int remove_dup_with_hash_index(THD *thd, TABLE *table,
 				      uint field_count, Field **first_field,
 				      ulong key_length);
-static SORT_FIELD * make_unireg_sortorder(ORDER *order, uint *length);
 static int join_init_cache(THD *thd,JOIN_TAB *tables,uint table_count);
 static ulong used_blob_length(CACHE_FIELD **ptr);
 static bool store_record_in_cache(JOIN_CACHE *cache);
 static void reset_cache(JOIN_CACHE *cache);
 static void read_cached_record(JOIN_TAB *tab);
 static bool cmp_buffer_with_ref(JOIN_TAB *tab);
-static int setup_order(THD *thd,TABLE_LIST *tables, List<Item> &fields,
-		       List <Item> &all_fields, ORDER *order);
 static int setup_group(THD *thd,TABLE_LIST *tables,List<Item> &fields,
 		       List<Item> &all_fields, ORDER *order, bool *hidden);
 static bool setup_new_fields(THD *thd,TABLE_LIST *tables,List<Item> &fields,
@@ -5409,8 +5406,7 @@ err:
 }
 
 
-static SORT_FIELD *
-make_unireg_sortorder(ORDER *order, uint *length)
+SORT_FIELD *make_unireg_sortorder(ORDER *order, uint *length)
 {
   uint count;
   SORT_FIELD *sort,*pos;
@@ -5752,8 +5748,7 @@ find_order_in_list(THD *thd,TABLE_LIST *tables,ORDER *order,List<Item> &fields,
 ** and doesn't exits in the select list, add it the the field list.
 */
 
-static int
-setup_order(THD *thd,TABLE_LIST *tables,List<Item> &fields,
+int setup_order(THD *thd,TABLE_LIST *tables,List<Item> &fields,
 	     List<Item> &all_fields, ORDER *order)
 {
   thd->where="order clause";

sql/sql_table.cc

@@ -32,6 +32,7 @@ static char *make_unique_key_name(const char *field_name,KEY *start,KEY *end);
 static int copy_data_between_tables(TABLE *from,TABLE *to,
 				    List<create_field> &create,
 				    enum enum_duplicates handle_duplicates,
+                                    ORDER *order,
 				    ha_rows *copied,ha_rows *deleted);
 
 /*****************************************************************************
@@ -1049,6 +1050,7 @@ int mysql_alter_table(THD *thd,char *new_db, char *new_name,
 		      List<create_field> &fields,
 		      List<Key> &keys,List<Alter_drop> &drop_list,
 		      List<Alter_column> &alter_list,
+                      ORDER *order,
 		      bool drop_primary,
 		      enum enum_duplicates handle_duplicates)
 {
@@ -1416,7 +1418,7 @@ int mysql_alter_table(THD *thd,char *new_db, char *new_name,
   thd->proc_info="copy to tmp table";
   next_insert_id=thd->next_insert_id;		// Remember for loggin
   error=copy_data_between_tables(table,new_table,create_list,handle_duplicates,
-				 &copied,&deleted);
+				 order, &copied,&deleted);
   thd->last_insert_id=next_insert_id;		// Needed for correct log
   thd->count_cuted_fields=0;			/* Don`t calc cuted fields */
   new_table->time_stamp=save_time_stamp;
@@ -1569,14 +1571,24 @@ end_temporary:
 
 
 static int
-copy_data_between_tables(TABLE *from,TABLE *to,List<create_field> &create,
+copy_data_between_tables(TABLE *from,TABLE *to,
+                         List<create_field> &create,
 			 enum enum_duplicates handle_duplicates,
-			 ha_rows *copied,ha_rows *deleted)
+                         ORDER *order,
+			 ha_rows *copied,
+                         ha_rows *deleted)
 {
   int error;
   Copy_field *copy,*copy_end;
   ulong found_count,delete_count;
   THD *thd= current_thd;
+  uint length;
+  SORT_FIELD *sortorder;
+  READ_RECORD info;
+  Field *next_field;
+  TABLE_LIST   tables;
+  List<Item>   fields;
+  List<Item>   all_fields;
   DBUG_ENTER("copy_data_between_tables");
 
   if (!(copy= new Copy_field[to->fields]))
@@ -1597,11 +1609,25 @@ copy_data_between_tables(TABLE *from,TABLE *to,List<create_field> &create,
       (copy_end++)->set(*ptr,def->field,0);
   }
 
-  READ_RECORD info;
+  if(order) {
+    from->io_cache=(IO_CACHE*) my_malloc(sizeof(IO_CACHE),
+                                         MYF(MY_FAE | MY_ZEROFILL));
+    bzero((char*) &tables,sizeof(tables));
+    tables.table = from;
+    error=1;
+
+    if (setup_order(thd, &tables, fields, all_fields, order) ||
+        !(sortorder=make_unireg_sortorder(order, &length)) ||
+        (from->found_records = filesort(&from, sortorder, length, 
+                                         (SQL_SELECT *) 0, 0L, HA_POS_ERROR))
+        == HA_POS_ERROR)
+      goto err;
+  };
+
   init_read_record(&info, thd, from, (SQL_SELECT *) 0, 1,1);
 
   found_count=delete_count=0;
-  Field *next_field=to->next_number_field;
+  next_field=to->next_number_field;
   while (!(error=info.read_record(&info)))
   {
     if (thd->killed)
@@ -1640,6 +1666,8 @@ copy_data_between_tables(TABLE *from,TABLE *to,List<create_field> &create,
     error=1;
   if (ha_commit(thd) || to->file->external_lock(thd,F_UNLCK))
     error=1;
+ err:
+  free_io_cache(from);
   *copied= found_count;
   *deleted=delete_count;
   DBUG_RETURN(error > 0 ? -1 : 0);

sql/sql_yacc.yy

@@ -1030,14 +1030,18 @@ alter:
 	  lex->col_list.empty();
 	  lex->drop_list.empty();
 	  lex->alter_list.empty();
+          lex->order_list.elements=0;
+          lex->order_list.first=0;
+          lex->order_list.next= (byte**) &lex->order_list.first;
 	  lex->db=lex->name=0;
     	  bzero((char*) &lex->create_info,sizeof(lex->create_info));
 	  lex->create_info.db_type= DB_TYPE_DEFAULT;
 	}
-	alter_list opt_create_table_options
-
+	alter_list order_clause opt_create_table_options
+ 
 alter_list:
-	  alter_list_item
+        /* empty */
+        | alter_list_item
 	| alter_list ',' alter_list_item
 
 add_column:
@@ -1075,7 +1079,7 @@ alter_list_item:
 	  { Lex->alter_list.push_back(new Alter_column($3.str,(Item*) 0)); }
 	| RENAME opt_to table_alias table_ident
 	  { Lex->db=$4->db.str ; Lex->name= $4->table.str; }
-	| create_table_option
+        | opt_create_table_options
 
 opt_column:
 	/* empty */	{}