Weekly update (August 22 ~ August 28, 2016)

Last week, we landed 26 PRs in the TiDB repositories and 26 PRs in the TiKV repositories.

Notable changes to TiDB

• Support the MySQL SetOption Command and Multiple Statements.
• Support filter push-down for the Time/Decimal type.
• Support converting OuterJoin to InnerJoin by using Null Reject.
• Support multiple-thread Hash Join.
• Support Garbage Collector.
• Optimize the code to improve the Performance.
• Fix several bugs.

Notable changes to TiKV

• Coprocessor supports the time type.
• Output the version information when TiKV starts.
• Append the write column family when committing lock-only keys to fix bug #921.
• Use randomized Placement Driver (PD) server and remove getting PD leader to solve issues #942 and #956.
• Support the Debug traits for messages in the sending channel.
• Coprocessor uses configuration to make the endpoint threadpool size configurable.

Notable changes to Placement Driver

• Output the version information when PD starts.
• Save the next timestamp oracle(TSO) to solve issue #191.