Breaking Changes

• Remove deprecated lock-related methods by @derrabus in https://github.com/doctrine/dbal/pull/6219
• Remove AbstractMySQLPlatform::getColumnTypeSQLSnippets() by @ausi in https://github.com/doctrine/dbal/pull/6214
• Remove API to disable column comments by @derrabus in https://github.com/doctrine/dbal/pull/6222

Improvements

• Move getJsonTypeDeclarationSQL() to AbstractMySQLPlatform by @derrabus in https://github.com/doctrine/dbal/pull/6216
• Relax return types of getExceptionConverter() implementations by @derrabus in https://github.com/doctrine/dbal/pull/6221

Changes from Lower Branches

• Enable establishing exclusive oci8 connections by @morozov in https://github.com/doctrine/dbal/pull/6182
• Add QueryBuilder::resetOrderBy() by @mbabker in https://github.com/doctrine/dbal/pull/6190
• Make the type annotation for CompositeExpression::count more specific by @oliverklee in https://github.com/doctrine/dbal/pull/6188
• Remove irrelevant details from the savepoint name by @morozov in https://github.com/doctrine/dbal/pull/6197
• MySQLSchemaManager: Check expected database type for json columns only by @cgknx in https://github.com/doctrine/dbal/pull/6189
• Fix MariaDB list columns performance by @ausi in https://github.com/doctrine/dbal/pull/6202
• Enable skipping locked rows in QueryBuilder by @morozov in https://github.com/doctrine/dbal/pull/6191
• Move schema part to the index by @greg0ire in https://github.com/doctrine/dbal/pull/6226
• Use different toctrees for different sections by @greg0ire in https://github.com/doctrine/dbal/pull/6240
• Switch to absolute paths by @greg0ire in https://github.com/doctrine/dbal/pull/6241
• Keep NVARCHAR(MAX) length as -1 by @kitloong in https://github.com/doctrine/dbal/pull/6251

Full Changelog: https://github.com/doctrine/dbal/compare/4.0.0-RC1...4.0.0-RC2