sql_table.cc:

  Fix CREATE LIKE TABLE .. temporary case

mysql-test/r/create.result

@@ -161,3 +161,63 @@ drop table if exists t1;
 create table t1 (a int, key(a));
 create table t2 (b int, foreign key(b) references t1(a), key(b));
 drop table if exists t1,t2;
+drop table if exists t1, t2, t3;
+create table t1(id int not null, name char(20));
+insert into t1 values(10,'mysql'),(20,'monty- the creator');
+create table t2(id int not null);
+insert into t2 values(10),(20);
+create table t3 like t1;
+show create table t3;
+Table	Create Table
+t3	CREATE TABLE `t3` (
+  `id` int(11) NOT NULL default '0',
+  `name` char(20) character set latin1 default NULL
+) TYPE=MyISAM CHARSET=latin1
+select * from t3;
+id	name
+create table if not exists t3 like t1;
+Warnings:
+Warning	1050	Table 't3' already exists
+select @@warning_count;
+@@warning_count
+1
+create temporary table t3 like t2;
+show create table t3;
+Table	Create Table
+t3	CREATE TEMPORARY TABLE `t3` (
+  `id` int(11) NOT NULL default '0'
+) TYPE=MyISAM CHARSET=latin1
+select * from t3;
+id
+drop table t3;
+show create table t3;
+Table	Create Table
+t3	CREATE TABLE `t3` (
+  `id` int(11) NOT NULL default '0',
+  `name` char(20) character set latin1 default NULL
+) TYPE=MyISAM CHARSET=latin1
+select * from t3;
+id	name
+drop table t3;
+create database test_$1;
+drop table if exists test_$1.t3;
+create table test_$1.t3 like t1;
+create temporary table t3 like test_$1.t3;
+show create table t3;
+Table	Create Table
+t3	CREATE TEMPORARY TABLE `t3` (
+  `id` int(11) NOT NULL default '0',
+  `name` char(20) character set latin1 default NULL
+) TYPE=MyISAM CHARSET=latin1
+create table t3 like t1;
+create table t3 like test_$1.t3;
+Table 't3' already exists
+create table non_existing_database.t1 like t1;
+Got one of the listed errors
+create table t3 like non_existing_table;
+Unknown table 'non_existing_table'
+create temporary table t3 like t1;
+Table 't3' already exists
+drop table t1, t2, t3;
+drop table t3;
+drop database test_$1;

mysql-test/t/create.test

@@ -113,3 +113,40 @@ drop table if exists t1;
 create table t1 (a int, key(a));
 create table t2 (b int, foreign key(b) references t1(a), key(b));
 drop table if exists t1,t2;
+
+#
+# Test for CREATE TABLE .. LIKE ..
+#
+
+drop table if exists t1, t2, t3;
+create table t1(id int not null, name char(20));
+insert into t1 values(10,'mysql'),(20,'monty- the creator');
+create table t2(id int not null);
+insert into t2 values(10),(20);
+create table t3 like t1;
+show create table t3;
+select * from t3;
+create table if not exists t3 like t1;
+select @@warning_count;
+create temporary table t3 like t2;
+show create table t3;
+select * from t3;
+drop table t3;
+show create table t3;
+select * from t3;
+drop table t3;
+create database test_$1;
+drop table if exists test_$1.t3;
+create table test_$1.t3 like t1;
+create temporary table t3 like test_$1.t3;
+show create table t3;
+create table t3 like t1;
+!$1050 create table t3 like test_$1.t3;
+--error 1044,1
+create table non_existing_database.t1 like t1;
+!$1051 create table t3 like non_existing_table;
+!$1050 create temporary table t3 like t1;
+drop table t1, t2, t3;
+drop table t3;
+drop database test_$1;
+

sql/mysql_priv.h

@@ -422,6 +422,9 @@ int mysql_alter_table(THD *thd, char *new_db, char *new_name,
 		      enum enum_duplicates handle_duplicates,
 		      enum enum_enable_or_disable keys_onoff=LEAVE_AS_IS,
 		      bool simple_alter=0);
+int mysql_create_like_table(THD *thd, TABLE_LIST *table,
+                            HA_CREATE_INFO *create_info,
+                            Table_ident *src_table);
 bool mysql_rename_table(enum db_type base,
 			const char *old_db,
 			const char * old_name,

sql/sql_parse.cc

@@ -1830,10 +1830,14 @@ mysql_execute_command(THD *thd)
     }
     else // regular create
     {
-      res = mysql_create_table(thd,tables->db ? tables->db : thd->db,
-			       tables->real_name, &lex->create_info,
-			       lex->create_list,
-			       lex->key_list,0,0,0); // do logging
+      if (lex->name)
+        res= mysql_create_like_table(thd, tables, &lex->create_info, 
+                                     (Table_ident *)lex->name); 
+      else
+        res= mysql_create_table(thd,tables->db ? tables->db : thd->db,
+			         tables->real_name, &lex->create_info,
+			         lex->create_list,
+			         lex->key_list,0,0,0); // do logging
       if (!res)
 	send_ok(thd);
     }

sql/sql_table.cc

@@ -1376,6 +1376,125 @@ int mysql_optimize_table(THD* thd, TABLE_LIST* tables, HA_CHECK_OPT* check_opt)
 }
 
 
+/*
+  Create a table identical to the specified table
+
+  SYNOPSIS
+    mysql_create_like_table()
+    thd	        Thread object
+    table       Table list (one table only)
+    create_info Create info
+    table_ident Src table_ident
+
+  RETURN VALUES
+    0	  ok
+    -1	error
+*/
+
+int mysql_create_like_table(THD* thd, TABLE_LIST* table, 
+                            HA_CREATE_INFO *create_info,
+                            Table_ident *table_ident)
+{
+  TABLE **tmp_table;
+  char src_path[FN_REFLEN], dst_path[FN_REFLEN];
+  char *db= table->db;
+  char *table_name= table->real_name;
+  char *src_db= thd->db;
+  char *src_table= table_ident->table.str;
+  int  err;
+ 
+  DBUG_ENTER("mysql_create_like_table");
+
+  /*
+    Validate the source table
+  */
+  if (table_ident->table.length > NAME_LEN ||
+      (table_ident->table.length &&
+       check_table_name(src_table,table_ident->table.length)) ||
+      table_ident->db.str && check_db_name((src_db= table_ident->db.str)))
+  {
+    net_printf(thd,ER_WRONG_TABLE_NAME,src_table);
+    DBUG_RETURN(0);
+  }
+
+  if ((tmp_table= find_temporary_table(thd, src_db, src_table)))
+    strxmov(src_path, (*tmp_table)->path, reg_ext, NullS);
+  else
+  {
+    strxmov(src_path, mysql_data_home, "/", src_db, "/", src_table, 
+            reg_ext, NullS); 
+    if (access(src_path, F_OK))
+    {
+      my_error(ER_BAD_TABLE_ERROR, MYF(0), src_table);
+      DBUG_RETURN(-1);
+    }
+  }
+
+  /*
+    Validate the destination table
+
+    skip the destination table name checking as this is already 
+    validated.
+  */
+  if (create_info->options & HA_LEX_CREATE_TMP_TABLE)
+  {
+    if (find_temporary_table(thd, db, table_name))
+      goto table_exists;
+    sprintf(dst_path,"%s%s%lx_%lx_%x%s",mysql_tmpdir,tmp_file_prefix,
+	    current_pid, thd->thread_id, thd->tmp_table++,reg_ext);
+    create_info->table_options|= HA_CREATE_DELAY_KEY_WRITE;
+  }
+  else
+  {
+    strxmov(dst_path, mysql_data_home, "/", db, "/", table_name, 
+            reg_ext, NullS); 
+    if (!access(dst_path, F_OK))
+      goto table_exists;
+  }
+
+  /* 
+    Create a new table by copying from source table
+  */
+  if (my_copy(src_path, dst_path, MYF(MY_WME)))
+    DBUG_RETURN(-1);
+
+  /*
+    As mysql_truncate don't work on a new table at this stage of 
+    creation, instead create the table directly (for both normal 
+    and temporary tables).
+  */
+  *fn_ext(dst_path)= 0; 
+  err= ha_create_table(dst_path, create_info, 1);
+  
+  if (create_info->options & HA_LEX_CREATE_TMP_TABLE)
+  {
+    if (err || !open_temporary_table(thd, dst_path, db, table_name, 1))
+    {
+      (void) rm_temporary_table(create_info->db_type, dst_path);
+      DBUG_RETURN(-1);
+    }
+  }
+  else if (err)
+  {
+    (void) quick_rm_table(create_info->db_type, db, table_name);
+    DBUG_RETURN(-1);
+  }
+  DBUG_RETURN(0);
+  
+table_exists:
+  if (create_info->options & HA_LEX_CREATE_IF_NOT_EXISTS)
+  {
+    char warn_buff[MYSQL_ERRMSG_SIZE];
+    sprintf(warn_buff,ER(ER_TABLE_EXISTS_ERROR),table_name);
+    push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 
+                 ER_TABLE_EXISTS_ERROR,warn_buff);
+    DBUG_RETURN(0);
+  }
+  my_error(ER_TABLE_EXISTS_ERROR, MYF(0), table_name);
+  DBUG_RETURN(-1);
+}
+
+
 int mysql_analyze_table(THD* thd, TABLE_LIST* tables, HA_CHECK_OPT* check_opt)
 {
 #ifdef OS2

sql/sql_yacc.yy

@@ -835,6 +835,7 @@ create:
 	  lex->create_info.options=$2 | $4;
 	  lex->create_info.db_type= (enum db_type) lex->thd->variables.table_type;
 	  lex->create_info.table_charset=thd->db_charset?thd->db_charset:default_charset_info;
+	  lex->name=0;
 	}
 	create2
 	{}
@@ -883,7 +884,13 @@ create:
 create2:
 	'(' field_list ')' opt_create_table_options create3 {}
 	| opt_create_table_options create3 {}
-        ;
+	| LIKE table_ident
+      	  {
+      	    LEX *lex=Lex;
+     	    if (!(lex->name= (char *)$2))
+              YYABORT;
+    	  }
+  	  ;
 
 create3:
 	/* empty */ {}