WL1424 Multiple MySQL Servers: SHOW TABLES etc. should detect new and delete old tables.

include/my_base.h:
  Added new bit to table create options
  Removed old error code HA_ERR_OLD_METADAT and reused it for HA_ERR_NO_SUCH_TABLE.
mysql-test/r/ndb_autodiscover.result:
  Updated test cases
mysql-test/t/ndb_autodiscover.test:
  Updated test cases
mysql-test/t/ndb_autodiscover2.test:
  Updated test cases
sql/discover.cc:
  Moved function create_table_from_handler to handler.cc
sql/ha_ndbcluster.cc:
  Improved discover functionality
  Added .ndb file
  Changed error code mappings for a table that does not exist in engine
  Check for ndb object in THD
  Updated ndbcluster_discover, ndbcluster_list_tables and ndbcluster_can_discover
sql/ha_ndbcluster.h:
  Improved discover
sql/handler.cc:
  Added new error message mapping.
  Moved function ha_create_table_from_engine to handler level
  Added new functions ha_can_discover, ha_list_tables and ha_table_exists
sql/handler.h:
  Added new error message mapping.
  Moved function ha_create_table_from_engine to handler level
  Added new functions ha_can_discover, ha_list_tables and ha_table_exists
sql/mysql_priv.h:
  Removed create_table_from_handler, moved to handler.h
sql/sql_base.cc:
  Renamed function create_table_from_handler
sql/sql_show.cc:
  Added new function mysql_discover_files and mysql_list_files. 
  Modified mysql_find_files to discover new and delete "old" files/tables.
sql/sql_table.cc:
  Renamed create_table_from_handler
  Call ha_create_table_from_engine, in order to discover the the frm file before it can be dropped.
sql/table.cc:
  Added mapping of the error code HA_ERR_NO_SUCH_TABLE

include/my_base.h

@@ -241,6 +241,7 @@ enum ha_base_keytype {
 #define HA_CREATE_TMP_TABLE	4
 #define HA_CREATE_CHECKSUM	8
 #define HA_CREATE_DELAY_KEY_WRITE 64
+#define HA_CREATE_FROM_ENGINE   128 
 
 	/* Bits in flag to _status */
 
@@ -287,7 +288,7 @@ enum ha_base_keytype {
 #define HA_ERR_ROW_IS_REFERENCED 152     /* Cannot delete a parent row */
 #define HA_ERR_NO_SAVEPOINT	 153     /* No savepoint with that name */
 #define HA_ERR_NON_UNIQUE_BLOCK_SIZE 154 /* Non unique key block size */
-#define HA_ERR_OLD_METADATA      155  /* The frm file on disk is old */
+#define HA_ERR_NO_SUCH_TABLE     155  /* The table does not exist in engine */
 #define HA_ERR_TABLE_EXIST       156  /* The table existed in storage engine */
 #define HA_ERR_NO_CONNECTION     157  /* Could not connect to storage engine */
 

mysql-test/r/ndb_autodiscover.result

-drop table if exists t1,t2,t3,t4,t5,t6,t9;
+drop table if exists t1,t2,t3,t4,t5,t6,t7,t9;
 flush status;
 create table t1(
 id int not null primary key,
@@ -94,8 +94,6 @@ ERROR 42S01: Table 't3' already exists
 show status like 'handler_discover%';
 Variable_name	Value
 Handler_discover	1
-SHOW TABLES FROM test;
-Tables_in_test
 create table IF NOT EXISTS t3(
 id int not null primary key,
 id2 int not null,
@@ -119,6 +117,40 @@ Variable_name	Value
 Handler_discover	2
 drop table t3;
 flush status;
+create table t7(
+id int not null primary key,
+name char(255)
+) engine=ndb;
+create table t6(
+id int not null primary key,
+name char(255)
+) engine=MyISAM;
+insert into t7 values (1, "Explorer");
+insert into t6 values (2, "MyISAM table");
+select * from t7;
+id	name
+1	Explorer
+show status like 'handler_discover%';
+Variable_name	Value
+Handler_discover	0
+flush tables;
+show tables from test;
+Tables_in_test
+t6
+t7
+show status like 'handler_discover%';
+Variable_name	Value
+Handler_discover	1
+flush tables;
+show table status;
+Name	Engine	Version	Row_format	Rows	Avg_row_length	Data_length	Max_data_length	Index_length	Data_free	Auto_increment	Create_time	Update_time	Check_time	Collation	Checksum	Create_options	Comment
+t6	MyISAM	9	Fixed	1	260	#	#	#	0	NULL	#	#	NULL	#	NULL		
+t7	ndbcluster	9	Fixed	100	0	#	#	#	0	NULL	#	#	NULL	#	NULL		
+show status like 'handler_discover%';
+Variable_name	Value
+Handler_discover	2
+drop table t6, t7;
+flush status;
 show status like 'handler_discover%';
 Variable_name	Value
 Handler_discover	0

mysql-test/t/ndb_autodiscover.test

 -- source include/have_ndb.inc
 
 --disable_warnings
-drop table if exists t1,t2,t3,t4,t5,t6,t9;
+drop table if exists t1,t2,t3,t4,t5,t6,t7,t9;
 --enable_warnings
 
 ################################################
@@ -122,7 +122,6 @@ create table t3(
 # IF NOT EXISTS wasn't specified
 
 show status like 'handler_discover%';
-SHOW TABLES FROM test;
 
 # now it should be discovered
 create table IF NOT EXISTS t3(
@@ -145,38 +144,76 @@ show status like 'handler_discover%';
 
 drop table t3;
 
-#######################################################
-# Test that a table that already exists as frm file
-# but not in NDB can be deleted from disk.
+##################################################
+# Test that a table that already exists in NDB 
+# is discovered when SHOW TABLES
+# is used
 #
 
-# Manual test
-#flush status;
-#
-#create table t4(
-#  id int not null primary key,
-#  name char(27)
-#) engine=ndb;
-#insert into t4 values (1, "Automatic");
-#select * from t4;
+flush status;
+
+create table t7(
+  id int not null primary key,
+  name char(255)
+) engine=ndb;
+create table t6(
+  id int not null primary key,
+  name char(255)
+) engine=MyISAM;
+insert into t7 values (1, "Explorer");
+insert into t6 values (2, "MyISAM table");
+select * from t7;
+show status like 'handler_discover%';
+
+# Remove the frm file from disk
+flush tables;
+system rm var/master-data/test/t7.frm ;
+
+show tables from test;
+show status like 'handler_discover%';
+
+# Remove the frm file from disk again
+flush tables;
+system rm var/master-data/test/t7.frm ;
+
+--replace_column 7 # 8 # 9 # 12 # 13 # 15 #
+show table status;
+show status like 'handler_discover%';
+
+drop table t6, t7;
+
+
+#######################################################
+# Test that a table that has been dropped from NDB
+# but still exists on disk, get a consistent error message
+# saying "No such table existed"
 #
+
+flush status;
+
+create table t4(
+  id int not null primary key,
+  name char(27)
+) engine=ndb;
+insert into t4 values (1, "Automatic");
+select * from t4;
+
 # Remove the table from NDB
-#system drop_tab -c "$NDB_CONNECTSTRING2" -d test t4 > /dev/null ;
-#system drop_tab -c "host=localhost:2200;nodeid=5" -d test t4 > /dev/null ;
-#
-#--error 1296
-#select * from t4;
-#
-#flush table t4;
-#--error 1016
-#select * from t4;
-#
-#show status like 'handler_discover%';
-#drop table t4;
-#flush tables;
-#show tables;
-#--error 1146
-#select * from t4;
+system exec $NDB_TOOLS_DIR/ndb_drop_table -d test t4; 
+
+system exec ../ndb/tools/ndb_show_tables > show_tables.log; 
+
+# Test that correct error is returned
+--error 1146
+select * from t4;
+--error 1146
+select * from t4;
+
+show status like 'handler_discover%';
+drop table t4;
+
+show tables;
+
 
 
 #########################################################
@@ -241,7 +278,6 @@ show status like 'handler_discover%';
 drop table t6;
 
 ######################################################
-# Simple test to show use of discover on startup
 # Note! This should always be the last step in this 
 # file, the table t9 will be used and dropped 
 # by ndb_autodiscover2
@@ -259,8 +295,7 @@ system rm var/master-data/test/t9.frm ;
 
 # Now leave test case, when ndb_autodiscover2 will  run, this 
 # MySQL Server will have been restarted because it has a 
-# ndb_autodiscover2-master.opt file. And thus the table should 
-# have been discovered by the "discover on startup" function.
+# ndb_autodiscover2-master.opt file.
 
 #TODO
 #SLECT * FROM t1, t2, t4;

mysql-test/t/ndb_autodiscover2.test

 -- source include/have_ndb.inc
 
 #
-# Simple test to show use of discover on startup
+# Simple test to show use of discover when the server has been restarted
 # The previous step has simply removed the frm file
 # from disk, but left the table in NDB
 #
 --sleep 3;
 select * from t9 order by a;
 
-# handler_discover should be zero
+# handler_discover should be 1
 show status like 'handler_discover%';
 
 drop table t9;
+
+

sql/discover.cc

@@ -125,47 +125,4 @@ int writefrm(const char *name, const void *frmdata, uint len)
 
 
 
-/*
-  Try to discover table from handler and 
-  if found, write the frm file to disk.
-  
-  RETURN VALUES:
-   0 : Table existed in handler and created 
-       on disk if so requested
-   1 : Table does not exist
-  >1 : error
-
-*/
 
-int create_table_from_handler(const char *db, 
-			      const char *name,
-			      bool create_if_found)
-{
-  int error= 0;  
-  const void* frmblob = NULL;
-  char path[FN_REFLEN];
-  uint frmlen = 0;
-  DBUG_ENTER("create_table_from_handler");
-  DBUG_PRINT("enter", ("create_if_found: %d", create_if_found));
-
-  if (ha_discover(db, name, &frmblob, &frmlen))
-    DBUG_RETURN(1); // Table does not exist
-
-  // Table exists in handler  
-  if  (create_if_found)
-  {
-    (void)strxnmov(path,FN_REFLEN,mysql_data_home,"/",db,"/",name,NullS);
-    // Save the frm file    
-    error = writefrm(path, frmblob, frmlen);
-  }
-    
-  if (frmblob)
-    my_free((char*) frmblob,MYF(0));
-  DBUG_RETURN(error);  
-}
-
-int table_exists_in_handler(const char *db, 
-			     const char *name)
-{ 
-  return (create_table_from_handler(db, name, false) == 0);
-}

sql/ha_ndbcluster.h

@@ -208,6 +208,8 @@ class ha_ndbcluster: public handler
   int ndb_err(NdbConnection*);
   bool uses_blob_value(bool all_fields);
 
+  int write_ndb_file();
+
  private:
   int check_ndb_connection();
 
@@ -248,8 +250,11 @@ int ndbcluster_rollback(THD *thd, void* ndb_transaction);
 
 void ndbcluster_close_connection(THD *thd);
 
-int ndbcluster_discover(const char* dbname, const char* name,
+int ndbcluster_discover(THD* thd, const char* dbname, const char* name,
 			const void** frmblob, uint* frmlen);
+int ndbcluster_can_discover(THD *thd, const char *name);
+int ndbcluster_list_tables(THD* thd, HASH* tables, const char* db);
+int ndbcluster_table_exists(THD* thd, const char *db, const char *name);
 int ndbcluster_drop_database(const char* path);
 
 void ndbcluster_print_error(int error, const NdbOperation *error_op);

sql/handler.cc

@@ -1119,6 +1119,16 @@ void handler::print_error(int error, myf errflag)
   case HA_ERR_NO_REFERENCED_ROW:
     textno=ER_NO_REFERENCED_ROW;
     break;
+  case HA_ERR_NO_SUCH_TABLE:
+  {
+    char *db;
+    char buff[FN_REFLEN];
+    uint length=dirname_part(buff,table->path);
+    buff[length-1]=0;
+    db=buff+dirname_length(buff);
+    my_error(ER_NO_SUCH_TABLE,MYF(0),db,table->table_name);
+    break;
+  }
   default:
     {
       /* The error was "unknown" to this function.
@@ -1265,6 +1275,71 @@ int ha_create_table(const char *name, HA_CREATE_INFO *create_info,
   DBUG_RETURN(error != 0);
 }
 
+/*
+  Try to discover table from engine and 
+  if found, write the frm file to disk.
+  
+  RETURN VALUES:
+   0 : Table existed in engine and created 
+       on disk if so requested
+   1 : Table does not exist
+  >1 : error
+
+*/
+
+int ha_create_table_from_engine(THD* thd, 
+				const char *db, 
+				const char *name,
+				bool create_if_found)
+{
+  int error= 0;  
+  const void* frmblob = NULL;
+  uint frmlen = 0;
+  char path[FN_REFLEN];
+  HA_CREATE_INFO create_info;
+  TABLE table;
+  DBUG_ENTER("ha_create_table_from_engine");
+  DBUG_PRINT("enter", ("db: %s, name: %s", db, name));
+  DBUG_PRINT("enter", ("create_if_found: %d", create_if_found));
+
+  bzero((char*) &create_info,sizeof(create_info));
+
+  if ((error= ha_discover(thd, db, name, &frmblob, &frmlen)))
+    DBUG_RETURN(error); 
+
+  // Table exists in handler  
+  if  (create_if_found)
+  {
+    (void)strxnmov(path,FN_REFLEN,mysql_data_home,"/",db,"/",name,NullS);
+    // Save the frm file    
+    if ((error = writefrm(path, frmblob, frmlen)))
+      goto err_end;
+
+    if (openfrm(path,"",0,(uint) READ_ALL, 0, &table))
+      DBUG_RETURN(1);
+
+    update_create_info_from_table(&create_info, &table);
+    create_info.table_options|= HA_CREATE_FROM_ENGINE;
+
+    if (lower_case_table_names == 2 &&
+	!(table.file->table_flags() & HA_FILE_BASED))
+    {
+      /* Ensure that handler gets name in lower case */
+      strmov(path, name);
+      my_casedn_str(files_charset_info, path);
+      name= path;
+    }
+    
+    error=table.file->create(path,&table,&create_info);
+    VOID(closefrm(&table));
+  }
+
+err_end:
+  if (frmblob)
+    my_free((char*) frmblob,MYF(0));
+  DBUG_RETURN(error);  
+}
+
 static int NEAR_F delete_file(const char *name,const char *ext,int extflag)
 {
   char buff[FN_REFLEN];
@@ -1372,15 +1447,15 @@ int ha_change_key_cache(KEY_CACHE *old_key_cache,
   Try to discover one table from handler(s)
 */
 
-int ha_discover(const char* dbname, const char* name,
-               const void** frmblob, uint* frmlen)
+int ha_discover(THD* thd, const char* db, const char* name,
+		const void** frmblob, uint* frmlen)
 {
   int error= 1; // Table does not exist in any handler
   DBUG_ENTER("ha_discover");
-  DBUG_PRINT("enter", ("db: %s, name: %s", dbname, name));
+  DBUG_PRINT("enter", ("db: %s, name: %s", db, name));
 #ifdef HAVE_NDBCLUSTER_DB
   if (have_ndbcluster == SHOW_OPTION_YES)
-    error= ndbcluster_discover(dbname, name, frmblob, frmlen);
+    error= ndbcluster_discover(thd, db, name, frmblob, frmlen);
 #endif
   if (!error)
     statistic_increment(ha_discover_count,&LOCK_status);
@@ -1388,6 +1463,65 @@ int ha_discover(const char* dbname, const char* name,
 }
 
 
+/*
+  Ask handler if it would support discover of a file 
+  with this name
+
+  RETURN
+   0     Does not recognise file
+   1     File can be discovered
+*/
+
+int ha_can_discover(THD* thd, const char* name)
+{
+  int error= 0; // Can't discover this file name
+  DBUG_ENTER("ha_can_discover");
+  DBUG_PRINT("enter", ("name: %s", name));
+#ifdef HAVE_NDBCLUSTER_DB
+  if (have_ndbcluster == SHOW_OPTION_YES)
+    error= ndbcluster_can_discover(thd, name);
+#endif
+  DBUG_RETURN(error);
+}
+
+/*
+  Get a list of tables that exists in handler(s)
+ */
+int ha_list_tables(THD* thd, HASH *tables, const char* db)
+{  
+  int error= 0;
+  DBUG_ENTER("ha_list_tables");
+  DBUG_PRINT("enter", ("db: %s", db));
+#ifdef HAVE_NDBCLUSTER_DB
+  if (have_ndbcluster == SHOW_OPTION_YES)
+    error= ndbcluster_list_tables(thd, tables, db);
+#endif
+  DBUG_RETURN(error);
+}
+
+/*
+  Ask handler if the table exists in engine
+
+  RETURN
+    0                   Table does not exist
+    1                   Table exists
+    #                   Error code
+
+ */
+int ha_table_exists(THD* thd, const char* db, const char* name)
+{
+  int error= 2;
+  DBUG_ENTER("ha_table_exists");
+  DBUG_PRINT("enter", ("db: %s, name: %s", db, name));
+#ifdef HAVE_NDBCLUSTER_DB
+  if (have_ndbcluster == SHOW_OPTION_YES)
+    error= ndbcluster_table_exists(thd, db, name);
+#endif
+  DBUG_RETURN(error);
+}
+
+
+
 /*
   Read first row between two ranges.
   Store ranges for future calls to read_range_next

sql/handler.h

@@ -532,6 +532,8 @@ void ha_close_connection(THD* thd);
 enum db_type ha_checktype(enum db_type database_type);
 int ha_create_table(const char *name, HA_CREATE_INFO *create_info,
 		    bool update_create_info);
+int ha_create_table_from_engine(THD* thd, const char *db, const char *name,
+				bool create_if_found);
 int ha_delete_table(enum db_type db_type, const char *path);
 void ha_drop_database(char* path);
 int ha_init_key_cache(const char *name, KEY_CACHE *key_cache);
@@ -553,5 +555,9 @@ bool ha_flush_logs(void);
 int ha_enable_transaction(THD *thd, bool on);
 int ha_change_key_cache(KEY_CACHE *old_key_cache,
 			KEY_CACHE *new_key_cache);
-int ha_discover(const char* dbname, const char* name,
+int ha_discover(THD* thd, const char* dbname, const char* name,
 		const void** frmblob, uint* frmlen);
+int ha_list_tables(THD* thd, HASH *tables, const char* db);
+int ha_table_exists(THD* thd, const char* db, const char* name);
+int ha_can_discover(THD* thd, const char* name);
+

sql/mysql_priv.h

@@ -1000,8 +1000,6 @@ int openfrm(const char *name,const char *alias,uint filestat,uint prgflag,
 	    uint ha_open_flags, TABLE *outparam);
 int readfrm(const char *name, const void** data, uint* length);
 int writefrm(const char* name, const void* data, uint len);
-int create_table_from_handler(const char *db, const char *name,
-			      bool create_if_found);
 int closefrm(TABLE *table);
 db_type get_table_type(const char *name);
 int read_string(File file, gptr *to, uint length);

sql/sql_base.cc

@@ -1343,7 +1343,7 @@ static int open_unireg_entry(THD *thd, TABLE *entry, const char *db,
       */
       if (discover_retry_count++ != 0)
        goto err;
-      if (create_table_from_handler(db, name, true) != 0)
+      if (ha_create_table_from_engine(thd, db, name, true) != 0)
        goto err;
 
       thd->clear_error(); // Clear error message

sql/sql_show.cc

@@ -358,30 +358,59 @@ int mysqld_show_column_types(THD *thd)
 }
 
 
+
+/*
+   Ask all engines if they can provide a list of available tables.
+   Returns a list of available tables.
+*/
+
+int 
+mysql_discover_tables(THD *thd, HASH *ha_tables, const char *db, bool dir)
+{
+  DBUG_ENTER("mysql_discover_files");
+  
+  if (dir)    
+    DBUG_RETURN(0); // Discover of directories(databases) not supported yet
+  
+  // Get list of files in storage engine
+  if (ha_list_tables(thd, ha_tables, db))
+    DBUG_RETURN(-1);
+
+  DBUG_PRINT("info",("discovered: %d files", ha_tables->records));
+  DBUG_RETURN(0);
+}
+
+
+/*
+  List all files or directories in a given location
+  Returns
+   files - list of files where wild card has been applied
+   all_files - list of all files
+   dsc_files - list of files which are discoverable
+*/
+
 int
-mysql_find_files(THD *thd,List<char> *files, const char *db,const char *path,
-                 const char *wild, bool dir)
+mysql_list_files(THD *thd, const char *db, const char *path, const char *wild, 
+		 bool dir, List<char> *files, HASH *all_files, HASH* dsc_files)
 {
   uint i;
-  char *ext;
+  char *ext, **dsc_ext;
   MY_DIR *dirp;
   FILEINFO *file;
 #ifndef NO_EMBEDDED_ACCESS_CHECKS
   uint col_access=thd->col_access;
 #endif
   TABLE_LIST table_list;
-  DBUG_ENTER("mysql_find_files");
+  DBUG_ENTER("mysql_list_files");
 
-  if (wild && !wild[0])
-    wild=0;
   bzero((char*) &table_list,sizeof(table_list));
-
+  
   if (!(dirp = my_dir(path,MYF(MY_WME | (dir ? MY_WANT_STAT : 0)))))
     DBUG_RETURN(-1);
 
-  for (i=0 ; i < (uint) dirp->number_off_files  ; i++)
+  for (i= 0; i < (uint)dirp->number_off_files; i++)
   {
-    file=dirp->dir_entry+i;
+    file= dirp->dir_entry+i;
     if (dir)
     {                                           /* Return databases */
 #ifdef USE_SYMDIR
@@ -391,7 +420,7 @@ mysql_find_files(THD *thd,List<char> *files, const char *db,const char *path,
 	/* Only show the sym file if it points to a directory */
 	char buff[FN_REFLEN], *end;
 	MY_STAT status;
-        *ext=0;                                 /* Remove extension */
+        *ext= 0;                                 /* Remove extension */
 	unpack_dirname(buff, file->name);
 	end= strend(buff);
 	if (end != buff && end[-1] == FN_LIBCHAR)
@@ -410,11 +439,36 @@ mysql_find_files(THD *thd,List<char> *files, const char *db,const char *path,
     }
     else
     {
-        // Return only .frm files which aren't temp files.
-      if (my_strcasecmp(system_charset_info, ext=fn_ext(file->name),reg_ext) ||
-          is_prefix(file->name,tmp_file_prefix))
-        continue;
-      *ext=0;
+      // Don't process temp files
+      if (is_prefix(file->name, tmp_file_prefix))
+	continue;
+
+      ext= fn_ext(file->name);
+      // Check for  files that indicates the table can be discovered
+      if (ha_can_discover(thd, file->name))
+      {
+	DBUG_PRINT("info", ("Discoverable file found: %s", file->name));
+	*ext= 0;
+	if (my_hash_insert(dsc_files, (byte*)thd->strdup(file->name)))
+	{
+	  my_dirend(dirp);
+	  DBUG_RETURN(-1);
+	}
+	continue;
+      }
+
+      // Return only .frm files
+      if (my_strcasecmp(system_charset_info, ext,reg_ext))
+	continue;
+      *ext=0;	  
+
+      // Insert into list of all .frm files
+      if (my_hash_insert(all_files, (byte*)thd->strdup(file->name)))
+      {
+	my_dirend(dirp);
+	DBUG_RETURN(-1);
+      }
+
       if (wild)
       {
 	if (lower_case_table_names)
@@ -443,11 +497,114 @@ mysql_find_files(THD *thd,List<char> *files, const char *db,const char *path,
       DBUG_RETURN(-1);
     }
   }
-  DBUG_PRINT("info",("found: %d files", files->elements));
   my_dirend(dirp);
   DBUG_RETURN(0);
 }
 
+extern "C" byte* ha_tables_get_key(const char *entry, uint *length,
+				   my_bool not_used __attribute__((unused)))
+{
+  *length= strlen(entry);
+  return (byte*) entry;
+}
+
+
+int
+mysql_find_files(THD *thd,List<char> *files, const char *db,
+		 const char *path, const char *wild, bool dir)
+{
+  int error= -1;
+  uint i;
+  bool discovery_performed= false;
+  DBUG_ENTER("mysql_find_files");
+  DBUG_PRINT("enter", ("db: %s, path: %s, wild: %s, dir: %d", 
+	     db, path, wild, dir));
+
+  if (wild && !wild[0])
+    wild=0;
+
+  HASH ha_tables, all_files, dsc_files;
+  if (hash_init(&ha_tables,system_charset_info,32,0,0,
+		(hash_get_key) ha_tables_get_key,0,0) || 
+      hash_init(&all_files,system_charset_info,32,0,0,
+		(hash_get_key) ha_tables_get_key,0,0) ||
+      hash_init(&dsc_files,system_charset_info,32,0,0,
+		(hash_get_key) ha_tables_get_key,0,0))
+    goto err_end;
+    
+  if (mysql_discover_tables(thd, &ha_tables, db, dir))
+    goto err_end;
+
+  if (mysql_list_files(thd, db, path, wild, dir,
+		       files, &all_files, &dsc_files))
+    goto err_end;
+
+  /*
+    Discovery part 1
+    Loop through handler files and see if any of them should be discovered
+  */
+  for (i= 0; i < ha_tables.records; i++)
+  {
+    const char *name = hash_element(&ha_tables, i);
+    if (hash_search(&all_files, name, strlen(name)))
+      continue;
+    
+    // Table was in handler, but not in list of all tables
+    DBUG_PRINT("info", ("Table to discover[%d]: %s", i, name));
+    pthread_mutex_lock(&LOCK_open);
+    ha_create_table_from_engine(thd, db, name, true);
+    pthread_mutex_unlock(&LOCK_open);      
+    discovery_performed= true;
+  }
+
+  /*
+    Discovery part2
+    Loop through dsc files and see if any of them need to be deleted
+  */
+  for (i= 0; i < dsc_files.records; i++)
+  {
+    const char *name = hash_element(&dsc_files, i);
+    if (hash_search(&ha_tables, name, strlen(name)))
+      continue;
+
+    //  Table was only on disk and not in handler
+    DBUG_PRINT("info", ("Table[%d]: %s only exists on disk", i, name));
+
+    // Verify that handler agrees table is gone.
+    if (ha_table_exists(thd, db, name) == 0)
+    {
+      // Delete the table and all related files
+      TABLE_LIST table_list;
+      bzero((char*) &table_list,sizeof(table_list));
+      table_list.db= (char*) db;
+      table_list.real_name=(char*)name;
+      (void)mysql_rm_table_part2_with_lock(thd, &table_list, 
+					   /* if_exists */ true, 
+					   /* drop_temporary */ false, 
+					   /* dont_log_query*/ true);
+      discovery_performed= true;
+    }
+  }
+  
+  if (discovery_performed)
+  {
+    // Call mysql_list_files one more time to get an updated list    
+    DBUG_PRINT("info", ("Calling mysql_list_files one more time"));
+    files->empty();
+    if (mysql_list_files(thd, db, path, wild, dir,
+			 files, &all_files, &dsc_files))
+      goto err_end;    
+  }
+
+  DBUG_PRINT("info",("found: %d files", files->elements));
+  error = 0;
+err_end:
+  hash_free(&ha_tables);
+  hash_free(&all_files);
+  hash_free(&dsc_files);
+  DBUG_RETURN(error);
+}
+
 
 /***************************************************************************
  Extended version of mysqld_show_tables

sql/sql_table.cc

@@ -216,7 +216,8 @@ int mysql_rm_table_part2(THD *thd, TABLE_LIST *tables, bool if_exists,
       strxmov(path, mysql_data_home, "/", db, "/", alias, reg_ext, NullS);
       (void) unpack_filename(path,path);
     }
-    if (drop_temporary || access(path,F_OK))
+    if (drop_temporary || 
+	(access(path,F_OK) && ha_create_table_from_engine(thd,db,alias,true)))
     {
       if (if_exists)
 	push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
@@ -1237,8 +1238,8 @@ int mysql_create_table(THD *thd,const char *db, const char *table_name,
   {
     bool create_if_not_exists =
       create_info->options & HA_LEX_CREATE_IF_NOT_EXISTS;
-    if (!create_table_from_handler(db, table_name,
-                                 create_if_not_exists))
+    if (!ha_create_table_from_engine(thd, db, table_name,
+				     create_if_not_exists))
     {
       DBUG_PRINT("info", ("Table already existed in handler"));
 

sql/table.cc

@@ -705,6 +705,14 @@ int openfrm(const char *name, const char *alias, uint db_stat, uint prgflag,
       outparam->crashed=((err == HA_ERR_CRASHED_ON_USAGE) &&
 			 outparam->file->auto_repair() &&
 			 !(ha_open_flags & HA_OPEN_FOR_REPAIR));
+
+      if (err==HA_ERR_NO_SUCH_TABLE)
+      {
+	/* The table did not exists in storage engine, use same error message
+	   as if the .frm file didn't exist */
+	error= 1;
+	my_errno= ENOENT;
+      }
       goto err_not_open; /* purecov: inspected */
     }
   }