This is the only way to fix ALTER TABLE bug with BDB

I wish I had connection stop  / start so that I could have made a 
test case.

Docs/manual.texi

@@ -46928,6 +46928,8 @@ not yet 100% confident in this code.
 @appendixsubsec Changes in release 3.23.52
 @itemize @bullet
 @item
+Fixed bug in ALTERing  TABLE of BDB type.
+@item
 Fixed bug when logging @code{LOAD DATA INFILE} to binary log with no 
 active database.
 @item

sql/sql_table.cc

@@ -1652,7 +1652,11 @@ int mysql_alter_table(THD *thd,char *new_db, char *new_name,
     VOID(pthread_mutex_unlock(&LOCK_open));
     goto err;
   }
-
+#ifdef HAVE_BERKELEY_DB
+  extern bool berkeley_flush_logs(void);
+  if (old_db_type == DB_TYPE_BERKELEY_DB &&  berkeley_flush_logs())
+    goto err;
+#endif
   thd->proc_info="end";
   mysql_update_log.write(thd, thd->query,thd->query_length);
   if (mysql_bin_log.is_open())