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tidb v4.0.7 Release Notes

Release Date: 2020-09-29 // about 3 years ago

  • 👌 Improvements

    • ➕ Add more runtime information for the join operator #20093
    • ➕ Add the hit ratio information of coprocessor cache in EXPLAIN ANALYZE #19972
    • 👌 Support pushing down the ROUND function to TiFlash #19967
    • ➕ Add the default value of CMSketch for ANALYZE #19927
    • Refine error message desensitization #20004
    • Accept connections from clients using connectors from MySQL 8.0 #19959

    🐛 Bug Fixes

    • 🛠 Fix a vectorization bug from and/or/COALESCE caused by shortcut #20092
    • 🛠 Fix the issue that plan digests are the same when the cop task stores are of different types #20076
    • 🛠 Fix the wrong behavior of the != any() function #20062
    • 🛠 Fix the query error that occurs when the slow-log file does not exist #20051
    • 🛠 Fix the issue that Region requests continue to retry when the context is canceled #20031
    • Fix the issue that querying the time type of the cluster_slow_query table in streaming request might result in an error #19943
    • 🛠 Fix the issue that DML statements using case when might cause schema change #20095
    • 🛠 Fix the issue that the prev_stmt information in slow log is not desensitized #20048
    • 🛠 Fix the issue that tidb-server does not release the table lock when it exits abnormally #20020
    • 🛠 Fix the incorrect error message that occurs when inserting data of the ENUM and SET type #19950
    • 🛠 Fix the wrong behavior of the IsTrue function in some situations #19903
    • 🛠 Fix the issue that the CLUSTER_INFO system table might not work normally after PD is scaled in or out #20026
    • ⚠ Avoid unnecessary warnings or errors when folding constants in control expressions #19910
    • ⚡️ Update the method of updating statistics to avoid Out of Memory (OOM) #20013