get the sql command that is being processed when the external_lock function is called

git-svn-id: file:///svn/mysql/tokudb-engine/src@4353 c7de825b-a66e-492c-adef-691d508d4ae1

storage/tokudb/ha_tokudb.cc

@@ -2855,7 +2855,7 @@ int ha_tokudb::reset(void) {
 //      error otherwise
 //
 int ha_tokudb::external_lock(THD * thd, int lock_type) {
-    TOKUDB_DBUG_ENTER("ha_tokudb::external_lock");
+    TOKUDB_DBUG_ENTER("ha_tokudb::external_lock %d", thd_sql_command(thd));
     // QQQ this is here to allow experiments without transactions
     if ((tokudb_init_flags & DB_INIT_TXN) == 0) 
         TOKUDB_DBUG_RETURN(0);