BUG#18676 In order to coincide with 5.0 mysqld error code after bug#18676, Map the 4009 ndb error code to 157 mysql error code

mysql-test/r/ndb_autodiscover.result:
  changes ndbd error code 4009 to mysqld error code 157 when no cluster connection
sql/ha_ndbcluster.cc:
  define return codes to ndbcluster_table_exists_in_engine to something useful
sql/handler.cc:
  define return codes to ha_table_exists_in_engine to something useful
sql/sql_plugin.cc:
  Add a comment
sql/sql_table.cc:
  clearly define what happens on create table if exists/not exists/not connected to engine
storage/ndb/src/ndbapi/ndberror.c:
  map 4009 ndb error code to 157 mysqld error code

mysql-test/r/ndb_autodiscover.result

@@ -382,7 +382,7 @@ create table t1 (a int primary key) engine=ndb;
 select * from t1;
 a
 select * from t1;
-ERROR HY000: Can't lock file (errno: 4009)
+ERROR HY000: Can't lock file (errno: 157)
 use test;
 drop database test_only_ndb_tables;
 CREATE TABLE t9 (

sql/ha_ndbcluster.cc

@@ -6244,9 +6244,9 @@ int ndbcluster_table_exists_in_engine(handlerton *hton, THD* thd,
     if (my_strcasecmp(system_charset_info, elmt.name, name))
       continue;
     DBUG_PRINT("info", ("Found table"));
-    DBUG_RETURN(1);
+    DBUG_RETURN(HA_ERR_TABLE_EXIST);
   }
-  DBUG_RETURN(0);
+  DBUG_RETURN(HA_ERR_NO_SUCH_TABLE);
 }
 
 
@@ -6608,7 +6608,7 @@ int ndbcluster_find_files(handlerton *hton, THD *thd,
     DBUG_PRINT("info", ("%s existed on disk", name));     
     // The .ndb file exists on disk, but it's not in list of tables in ndb
     // Verify that handler agrees table is gone.
-    if (ndbcluster_table_exists_in_engine(hton, thd, db, file_name) == 0)    
+    if (ndbcluster_table_exists_in_engine(hton, thd, db, file_name) == HA_ERR_NO_SUCH_TABLE)    
     {
       DBUG_PRINT("info", ("NDB says %s does not exists", file_name));     
       it.remove();

sql/handler.cc

@@ -2860,20 +2860,21 @@ ha_find_files(THD *thd,const char *db,const char *path,
   DBUG_RETURN(error);
 }
 
-
-/** @brief
+/*
   Ask handler if the table exists in engine
 
   RETURN
-    0                   Table does not exist
-    1                   Table exists
-    #                   Error code
+    HA_ERR_NO_SUCH_TABLE     Table does not exist
+    HA_ERR_TABLE_EXIST       Table exists
+    #                        Error code
+
+ */
 
-*/
 struct st_table_exists_in_engine_args
 {
   const char *db;
   const char *name;
+  int err;
 };
 
 static my_bool table_exists_in_engine_handlerton(THD *thd, st_plugin_int *plugin,
@@ -2882,23 +2883,27 @@ static my_bool table_exists_in_engine_handlerton(THD *thd, st_plugin_int *plugin
   st_table_exists_in_engine_args *vargs= (st_table_exists_in_engine_args *)arg;
   handlerton *hton= (handlerton *)plugin->data;
 
+  int err= HA_ERR_NO_SUCH_TABLE;
+
   if (hton->state == SHOW_OPTION_YES && hton->table_exists_in_engine)
-    if ((hton->table_exists_in_engine(hton, thd, vargs->db, vargs->name)) == 1)
-      return TRUE;
+    err = hton->table_exists_in_engine(hton, thd, vargs->db, vargs->name);
+
+  vargs->err = err;
+  if (vargs->err == HA_ERR_TABLE_EXIST)
+    return TRUE;
 
   return FALSE;
 }
 
 int ha_table_exists_in_engine(THD* thd, const char* db, const char* name)
 {
-  int error= 0;
   DBUG_ENTER("ha_table_exists_in_engine");
   DBUG_PRINT("enter", ("db: %s, name: %s", db, name));
-  st_table_exists_in_engine_args args= {db, name};
-  error= plugin_foreach(thd, table_exists_in_engine_handlerton,
+  st_table_exists_in_engine_args args= {db, name, HA_ERR_NO_SUCH_TABLE};
+  plugin_foreach(thd, table_exists_in_engine_handlerton,
                  MYSQL_STORAGE_ENGINE_PLUGIN, &args);
-  DBUG_PRINT("exit", ("error: %d", error));
-  DBUG_RETURN(error);
+  DBUG_PRINT("exit", ("error: %d", args.err));
+  DBUG_RETURN(args.err);
 }
 
 #ifdef HAVE_NDB_BINLOG

sql/sql_plugin.cc

@@ -1009,6 +1009,7 @@ my_bool plugin_foreach_with_mask(THD *thd, plugin_foreach_func *func,
       rw_unlock(&THR_LOCK_plugin);
     }
     plugin= plugins[idx];
+    /* It will stop iterating on first engine error when "func" returns TRUE */
     if (plugin && func(thd, plugin, arg))
         goto err;
   }

sql/sql_table.cc

@@ -3481,15 +3481,25 @@ bool mysql_create_table_internal(THD *thd,
   {
     bool create_if_not_exists =
       create_info->options & HA_LEX_CREATE_IF_NOT_EXISTS;
-
-    if (ha_table_exists_in_engine(thd, db, table_name))
+    int retcode = ha_table_exists_in_engine(thd, db, table_name);
+    DBUG_PRINT("info", ("exists_in_engine: %u",retcode));
+    switch (retcode)
     {
-      DBUG_PRINT("info", ("Table with same name already existed in handler"));
+      case HA_ERR_NO_SUCH_TABLE:
+        /* Normal case, no table exists. we can go and create it */
+        break;
+      case HA_ERR_TABLE_EXIST:
+        DBUG_PRINT("info", ("Table existed in handler"));
 
-      if (create_if_not_exists)
-        goto warn;
-      my_error(ER_TABLE_EXISTS_ERROR,MYF(0),table_name);
-      goto unlock_and_end;
+        if (create_if_not_exists)
+          goto warn;
+        my_error(ER_TABLE_EXISTS_ERROR,MYF(0),table_name);
+        goto unlock_and_end;
+        break;
+      default:
+        DBUG_PRINT("info", ("error: %u from storage engine", retcode));
+        my_error(retcode, MYF(0),table_name);
+        goto unlock_and_end;
     }
   }
 

storage/ndb/src/ndbapi/ndberror.c

@@ -151,7 +151,7 @@ ErrorBundle ErrorCodes[] = {
    */
   { 4007, DMEC, UR, "Send to ndbd node failed" },
   { 4008, DMEC, UR, "Receive from NDB failed" },
-  { 4009, DMEC, UR, "Cluster Failure" },
+  { 4009, HA_ERR_NO_CONNECTION, UR, "Cluster Failure" },
   { 4012, DMEC, UR, 
     "Request ndbd time-out, maybe due to high load or communication problems"}, 
   { 4013, DMEC, UR, "Request timed out in waiting for node failure"},