TiDB 2.0.3 Release Notes

On June 1, 2018, TiDB 2.0.3 is released. Compared with TiDB 2.0.2, this release has great improvement in system compatibility and stability.

TiDB

• Support modifying the log level online
• Support the COM_CHANGE_USER command
• Support using the TIME type parameters under the binary protocol
• Optimize the cost estimation of query conditions with the BETWEEN expression
• Do not display the FOREIGN KEY information in the result of SHOW CREATE TABLE
• Optimize the cost estimation for queries with the LIMIT clause
• Fix the issue about the YEAR type as the unique index
• Fix the issue about ON DUPLICATE KEY UPDATE in conditions without the unique index
• Fix the compatibility issue of the CEIL function
• Fix the accuracy issue of the DIV calculation in the DECIMAL type
• Fix the false alarm of ADMIN CHECK TABLE
• Fix the panic issue of MAX/MIN under specific expression parameters
• Fix the issue that the result of JOIN is null in special conditions
• Fix the IN expression issue when building and querying Range
• Fix a Range calculation issue when using Prepare to query and Plan Cache is enabled
• Fix the issue that the Schema information is frequently loaded in abnormal conditions

PD

• Fix the panic issue when collecting hot-cache metrics in specific conditions
• Fix the issue about scheduling of the obsolete Regions

TiKV

• Fix the bug that the learner flag mistakenly reports to PD
• Report an error instead of getting a result if divisor/dividend is 0 in do_div_mod