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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