TiDB 1.0.2 Release Notes

On November 13, 2017, TiDB 1.0.2 is released with the following updates:

TiDB

• Optimize the cost estimation of index point query
• Support the Alter Table Add Column (ColumnDef ColumnPosition) syntax
• Optimize the queries whose where conditions are contradictory
• Optimize the Add Index operation to rectify the progress and reduce repetitive operations
• Optimize the Index Look Join operator to accelerate the query speed for small data size
• Fix the issue with prefix index judgment

Placement Driver (PD)

• Improve the stability of scheduling under exceptional situations

TiKV

• Support splitting table to ensure one region does not contain data from multiple tables
• Limit the length of a key to be no more than 4 KB
• More accurate read traffic statistics
• Implement deep protection on the coprocessor stack
• Fix the LIKE behavior and the do_div_mod bug