Weekly update in TiDB

Last week, we landed 57 PRs in the TiDB repository.

Added

• Add SHOW FULL TABLES to display the View status
• Provide virtual table facilities

Improved

• Generate the logical property for Group of the Cascades planner
• Improve the label of the QueryDurationHistogram metric
• Improve the compatibility with the old MySQL handshake protocol
• Support building DataS from View
• Remove the timezone information of records in mysql.tidb
• Improve selectivity estimation for the correlated column
• Refine transaction commit slow logs
• Check the null flag when eliminating the count aggregation
• Add support for recursive virtual columns
• Use single delRange and sessionPool in DDL
• Check the privilege of the ANALYZE TABLE statement
• Adjust the worker number of Add Index dynamically

Fixed

• Avoid the overlapped range for the prefix index
• Validate the value for the time_zone global system variable
• Fix the panic when generating the index join for partitioned tables
• Avoid goroutine leak for hash aggregation
• Fix the failure when executing delete...from...join... with binlog enabled
• Fix the problem of adding partitions concurrently
• Fix the parser panic caused by hint in the subquery
• Return null when casting non-binary data to the huge binary type
• Fix the bug of canceling Drop Column
• Fix the bug of canceling Drop Table/Database

Weekly update in TiSpark

Last week, we landed 9 PRs in the TiSpark repository.

Added

• Add set and enum type support
• Add time type support
• Add year type support

Weekly update in TiKV and PD

Last week, we landed 34 PRs in the TiKV and PD repositories.

Added

• Introduce a new storage engine: Titan
• Introduce the batch system
• Add left_binary and right_binary built-in functions
• Add the add to_days built-in function
• Add the date_diff built-in function
• Use Observers to collect Region information to a collection
• Implement the Seek Region on RegionInfoAccessor

Improved

• Perform a full synchronization of a new member

New contributors (Thanks!)

tikv:

• Fullstop000
• GinYM
• edwardpku

parser:

• SwanSpouse
• liutang123
• o-oops
• wangbo

docs-cn:

• httpcheck