On February 11, 2018, TiDB 1.0.8 is released with the following updates:
Outer Joinresult in some scenarios
Add Column Afterstatement
DeleteFilesInRangesto clear stale data and improve the TiKV starting speed
Decimalin Coprocessor sum
To upgrade from 1.0.7 to 1.0.8, follow the rolling upgrade order of PD -> TiKV -> TiDB.