TiDB 4.0.0-rc released, distributed NewSQL database

TiDB 4.0.0-rc has been released, the specific updates of this version are as follows: 

Compatibility Changes

• When tidb server status port is occupied, refuse to start instead of returning to alert log # 15177

Bug Fixes

• Fix the following issue: Due to incorrect job query in internal records, when using PREPARE statement to execute DDL job, replication between upstream and downstream may be wrong # 15435
• Fix Read Commitedwrong subquery results in isolation level # 15471
• Fixes an issue that may occur with incorrect behavior when INSERT ... VALUESspecifying BIT(N)data types # 15350
• Fix the following problem: DDL job internal retry cannot fully achieve the expected result because the ErrorCountfailed value cannot be summed correctly # 15373
• Fix Garbage Collection may not work properly when TiDB is connected to TiFlash # 15505
• Resolved an issue with incorrect results caused by Inline Projection optimization # 15411
• Fix INL_MERGE_JOINthe problem that the SQL prompt is executed incorrectly in some cases # 15515
• Fixed an AutoRandomissue where columns with attributes were re-referenced when explicitly writing negative numbers to these columns # 15397

New features and improvements

• Add case-sensitive collation so users can enable utf8mb4_general_ci and utf8_general_ci in the new cluster # 33
• Enhanced RECOVER TABLEsyntax to support recovery of truncated tables # 15398
• When tidb server status port is occupied, refuse to start instead of returning to alert log # 15177
• Use sequence as default column value to optimize write performance # 15216
• Add DDLJobssystem table to query DDL job details # 14837
• Optimize aggFuncSumperformance # 14887
• Optimized EXPLAINoutput # 15507

Update instructions: https://github.com/pingcap/tidb/releases/tag/v4.0.0-rc