Fixed problem with BDB tables and ALTER TABLE

Docs/manual.texi:
  ChangeLog
mysql-test/t/bdb-crash.test:
  Don't run test if BDB is not configured
sql/sql_base.cc:
  Added free on error

Docs/manual.texi

@@ -46930,6 +46930,8 @@ not yet 100% confident in this code.
 @appendixsubsec Changes in release 3.23.54
 @itemize
 @item
+Fixed a problem with BDB and @code{ALTER TABLE}.
+@item
 Fixed reference to freed memory when doing complicated @code{GROUP BY
 ... ORDER BY} queries.  Symptom was that @code{mysqld} died in function
 @code{send_fields}.

mysql-test/t/bdb-crash.test

+-- source include/have_bdb.inc
+
 # test for bug reported by Mark Steele
 
 drop table if exists t1;

sql/sql_base.cc

@@ -1530,6 +1530,7 @@ TABLE *open_temporary_table(THD *thd, const char *path, const char *db,
 	      ha_open_options,
 	      tmp_table))
   {
+    my_free((char*) tmp_table,MYF(0));
     DBUG_RETURN(0);
   }
 

sql/sql_table.cc

@@ -1680,16 +1680,24 @@ int mysql_alter_table(THD *thd,char *new_db, char *new_name,
 #ifdef HAVE_BERKELEY_DB
   if (old_db_type == DB_TYPE_BERKELEY_DB)
   {
-    (void) berkeley_flush_logs();
     /*
       For the alter table to be properly flushed to the logs, we
       have to open the new table.  If not, we get a problem on server
       shutdown.
     */
-    if (!open_tables(thd, table_list))		// Should always succeed
+    char path[FN_REFLEN];
+    (void) sprintf(path,"%s/%s/%s",mysql_data_home,new_db,table_name);
+    fn_format(path,path,"","",4);
+    table=open_temporary_table(thd, path, new_db, tmp_name,0);
+    if (table)
     {
-      close_thread_table(thd, &table_list->table);
+      intern_close_table(table);
+      my_free((char*) table, MYF(0));
     }
+    else
+      sql_print_error("Warning: Could not open BDB table %s.%s after rename\n",
+		      new_db,table_name);
+    (void) berkeley_flush_logs();
   }
 #endif