tidb-server v1.0.8

• Fix issues in the Outer Join result in some scenarios
• Optimize the performance of the InsertIntoIgnore statement
• Fix the issue in the ShardRowID option
• Add limitation (Configurable, the default value is 5000) to the DML statements number within a transaction
• Fix an issue in the Table/Column aliases returned by the Prepare statement
• Fix an issue in updating statistics delta
• Fix a panic error in the Drop Column statement
• Fix an DML issue when running the Add Column After statement
• Improve the stability of the GC process by ignoring the regions with GC errors
• Run GC concurrently to accelerate the GC process
• Provide syntax support for the CREATE INDEX statement