Support for EF Core 10 and test fixes (MySQL 8+, ReadOnlySpan, collation)

[omarbaruzzo]

Summary

This PR updates the solution for EF Core 10 compatibility and fixes several functional test failures encountered with current dependencies and MySQL 8+.

Changes

Library

• MySqlQuerySqlGenerator: for single-argument aggregate functions (AVG, SUM, MIN, MAX, etc.), generate Name(arg) instead of calling base, to preserve the previous SQL shape and avoid breaking changes for users when EF Core 9.x started generating Name((arg)).

Tests

• ReadOnlySpan / expression tree: replaced local arrays with List<T> in query tests where Contains() was used, so that the expression tree uses Enumerable.Contains instead of span-based overloads and the interpreter no longer fails (e.g. EscapesMySqlTestBase, GearsOfWarQueryMySqlTest, TPCGearsOfWarQueryMySqlTest, TPTGearsOfWarQueryMySqlTest).
• Migrations: added [SupportedServerVersionCondition(DefaultExpression, AlternativeDefaultExpression)] to tests that add primitive collection columns with default values, so they are skipped on MySQL 5.7 where those defaults are not supported.
• README (IntegrationTests, FunctionalTests): added a note that tests are intended to be run against MySQL 8.0+ or equivalent MariaDB.

Testing

• Build and unit tests: OK
• Integration tests: OK (with migrations and MySQL 8+)
• Functional tests: OK (with MySQL 8+ and unicode_ci database where applicable)

Notes

• Database for functional tests is expected to be MySQL 8.0+ (or equivalent MariaDB); some tests are skipped on older servers via version conditions.

Omar Baruzzo

[jackieevans3935]

@lauxjpn When is this PR going to be reviewed? Its been sitting for 2 weeks and has no response from you. We need to migrate to EF Core 10 and looking at weeks worth of work to migrate to Oracle's EF implementation.

[roji]

@jackieevans3935 this is an open source, volunteer-based project - as far as I know you're not paying the maintainers. So I'd at least tone down my language.

[jackieevans3935]

Fair point, I sponsored this project now to help give this migration the needed financial support