Fix the behavior in the aggregate operator: for the
select a, c from t groupby t.b statement,
c should use the first row in the group.
Add sequence number in binlog to preserve the original mutation order.
driver.go from the TiDB project to enable users to use the MySQL official driver.
Add the following new guides:
Last week, we landed 20 PRs in the TiKV repositories.
Add and report the store labels to Placement Driver (PD).
Add pending task metrics for Worker.
Dump all the statistics about Column Family compaction and Database.
Get the first value no matter if it is Null in aggregation.
Fix a Garbage Collection bug which deletes the latest deleted key before SafePoint.