Manual merge of fix for bug #6081 "Call to deprecated mysql_create_db()

function crashes server" with main tree.

sql/sql_parse.cc

@@ -1562,6 +1562,7 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
   case COM_CREATE_DB:				// QQ: To be removed
     {
       char *db=thd->strdup(packet), *alias;
+      HA_CREATE_INFO create_info;
 
       statistic_increment(com_stat[SQLCOM_CREATE_DB],&LOCK_status);
       // null test to handle EOM
@@ -1573,8 +1574,9 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
       if (check_access(thd,CREATE_ACL,db,0,1,0))
 	break;
       mysql_log.write(thd,command,packet);
+      bzero(&create_info, sizeof(create_info));
       if (mysql_create_db(thd, (lower_case_table_names == 2 ? alias : db),
-                          0, 0) < 0)
+                          &create_info, 0) < 0)
         send_error(thd, thd->killed ? ER_SERVER_SHUTDOWN : 0);
       break;
     }

tests/client_test.c

@@ -10688,6 +10688,31 @@ static void test_bug6046()
 }
 
 
+/*
+  Altough mysql_create_db(), mysql_rm_db() are deprecated since 4.0 they
+  should not crash server and should not hang in case of errors.
+
+  Since those functions can't be seen in modern API (unless client library
+  was compiled with USE_OLD_FUNCTIONS define) we use simple_command() macro.
+*/
+static void test_bug6081()
+{
+  int rc;
+  myheader("test_bug6081");
+
+  rc= simple_command(mysql, COM_DROP_DB, current_db,
+                     (ulong)strlen(current_db), 0);
+  myquery(rc);
+  rc= simple_command(mysql, COM_DROP_DB, current_db,
+                     (ulong)strlen(current_db), 0);
+  myquery_r(rc);
+  rc= simple_command(mysql, COM_CREATE_DB, current_db,
+                     (ulong)strlen(current_db), 0);
+  myquery(rc);
+  rc= simple_command(mysql, COM_CREATE_DB, current_db,
+                     (ulong)strlen(current_db), 0);
+  myquery_r(rc);
+}
 
 
 /*
@@ -11004,6 +11029,7 @@ int main(int argc, char **argv)
     test_bug6058();         /* check support for 0000-00-00 dates */
     test_bug6059();         /* correct metadata for SELECT ... INTO OUTFILE */
     test_bug6046();         /* NATURAL JOIN transformation works in PS */
+    test_bug6081();         /* test of mysql_create_db()/mysql_rm_db() */
     /*
       XXX: PLEASE RUN THIS PROGRAM UNDER VALGRIND AND VERIFY THAT YOUR TEST
       DOESN'T CONTAIN WARNINGS/ERRORS BEFORE YOU PUSH.