FIX BUGS: 1.Fix some bugs in fill query for super table. 2.Fix the crash while executing "show variables" command. 3.Fix JDBC memory leak whiling invoking the C native library. 4.The default output column name for arithmetic expression is set to the original user input. 5.Add some checks for memory allocation failure. NEW FEATURES: 1.The constant value column in select clause is supported. 2.The binary tags can be used as the join query condition for super tables. ENHANCEMENTS: 1.Optimized the last_row query performance. 2.Reducing the memory consumptions during the time interval query.