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tidb v2.1.8 Release Notes

Release Date: 2019-04-12 // about 5 years ago
    • 🛠 Fix the issue that the processing logic of GROUP_CONCAT function is incompatible with MySQL when there is a NULL-valued parameter #9930
    • 🛠 Fix the equality check issue of decimal values in the Distinct mode #9931
    • 🛠 Fix the collation compatibility issue of the date, datetime, and timestamp types for the SHOW FULL COLUMNS statement
    • 🛠 Fix the issue that the row count estimation is inaccurate when the filtering condition contains correlated columns #9937
    • ➕ Fix the compatibility issue between the DATE_ADD and DATE_SUB functions
    • Support the %H format for the STR_TO_DATE function to improve compatibility #9964
    • 🛠 Fix the issue that the result is wrong when the GROUP_CONCAT function groups by a unique index #9969
    • ⚡️ Return a warning when the Optimizer Hints contains an unmatched table name #9970
    • 🔊 Unify the log format to facilitate collecting logs using tools for analysis Unified Log Format
    • 🛠 Fix the issue that a lot of NULL values cause inaccurate statistics estimation #9979
    • 🛠 Fix the issue that an error is reported when the default value of the TIMESTAMP type is the boundary value #9987
    • Validate the value of time_zone #10000
    • 👌 Support the 2019.01.01 time format #10001
    • 🛠 Fix the issue that the row count estimation is displayed incorrectly in the result returned by the EXPLAIN statement in some cases #10044
    • 🛠 Fix the issue that KILL TIDB [session id] cannot instantly stop the execution of a statement in some cases #9976
    • 🛠 Fix the predicate pushdown issue of constant filtering conditions in some cases #10049
    • 🛠 Fix the issue that a read-only statement is not processed correctly in some cases #10048