This version fixes the following bugs
1. #544 Fix race in jni initialization
2. #560 First/last query on metric may cause server crash
3. #564 Enables the grafana connector to support microsecond precision databases
4. #569 Fix the possibility of random memory access in http module
5. #568 Create table statement may cause server crash
6. #570 Failed to set the error code if client (taos) version is not matched with server(taosd) version
7. #571 Memory leak exists when parsing a "create-table" sql expression
8. #584 Enable the hash table of the cache to automatically resize as the elements of data added into the cache.
9. #604 Taos_print_row may put the null-terminal into the final string
10. #606 Add the UID check for each data block that is submitted to the vnode
11. #608 Int hash function is available for bigint that are greater than INT32_MAX and negative integers
12. #614 Import file cause shell crash
11. #619 Release taos-jdbcdriver.jar to maven central repo
12. #621 Update english single quote and less than or equal to <=
13. #623 Fixed bugs relating to timestamps for node connector

New features in this version
1. close the monitor and clear client logs from taos client terminal
2. support group by the normal column
3. retrieve the metadata in a batch in the API
4. delete all tables under a super table by derectly deleting this super table
5. check the uid in the tables to be inserted and return the correct code
6. support the query on the column with the datatype "nchar"
7. support "or" in the "where" filter
8. support to transpose the query results displayed by adding "\G" in the taos client terminal

Features in the next version
1. enhance the check of system memory
2. support arithmetric function on the aggregation query results, for example, Select sum(a)+sum(b)
3. support count(distinct x) through HLL algorithm
4. support histogram
5. support the window to display the changed state