Enhancements:

• Performance optimization for both data writing and query
• FILL is supported in stream processing
• interp function can return timestamp
• Add index by default for system builtin tables
• Some columns can't be queried from information_schema.ins_tables

Fixed Bugs:

• Memory leak in TDengine CLI
• The result is different when querying first with or without interval
• Query returns empty data set
• Error result when delete source data of a stream processing
• taosd crash