Major Changes

• Implement zlib compression. (Implement zlib compression #1487 )
• Supported Go version is updated to Go 1.21+. (ci: update Go and staticcheck versions #1639 )
• Add support for VECTOR type introduced in MySQL 9.0. (Add support for new VECTOR type #1609 )
• Config object can have custom dial function. (Specify a custom dial function per config #1527 )

Bugfixes

• Fix auth errors when username/password are too long. (Fix auth errors when username/password are too long (#1482) #1625 )
• Check if MySQL supports CLIENT_CONNECT_ATTRS before sending client attributes. (Check if MySQL supports CLIENT_CONNECT_ATTRS before sending client attributes. #1640 )
• Fix auth switch request handling. (Failing to strip null terminator from authData in case of AuthSwitchRequest causes Access denied #1666 )

Other changes

• Add "filename:line" prefix to log in go-mysql. Custom loggers now show it. (log: add "filename:line" prefix by ourself #1589 )
• Improve error handling. It reduces the "busy buffer" errors. (fix some write error handling #1595 , improve error handling in writePacket #1601 , Reduce "busy buffer" logs #1641 )
• Use strconv.Atoi to parse max_allowed_packet. (better max_allowed_packet parsing #1661 )
• rejectReadOnly option now handles ER_READ_ONLY_MODE (1290) error too. (Add error 1290/ER_READ_ONLY_MODE to rejectReadOnly handling #1660 )

Full Changelog: v1.8.1...v1.9.0

New Contributors

• @dbussink made their first contribution in Add support for new VECTOR type #1609
• @yokonao made their first contribution in Check mysqlConnector.canceled.Value when failed to TLS handshake #1615
• @pengbanban made their first contribution in chore: fix comment #1620
• @aaronjheng made their first contribution in Specify a custom dial function per config #1527
• @kratkyzobak made their first contribution in Fix auth errors when username/password are too long (#1482) #1625
• @raffertyyu made their first contribution in Check if MySQL supports CLIENT_CONNECT_ATTRS before sending client attributes. #1640
• @minhquang4334 made their first contribution in Fix typo in comment: 'finish' should be 'cancel' #1647
• @joe-mann made their first contribution in Implement zlib compression #1487
• @arturmelanchyk made their first contribution in Make fileRegister a set #1653
• @kolbe made their first contribution in Add error 1290/ER_READ_ONLY_MODE to rejectReadOnly handling #1660
• @bdollma-te made their first contribution in Fix for issue #1666 #1667