Bump ClickHouse.Driver to 1.4.0-rc1

[alex-clickhouse]

Bumps ClickHouse.Driver from 1.3.0 to 1.4.0-rc1 so we can validate the release candidate against this provider before 1.4.0 ships.

Change

Three pins, kept in lockstep so the provider and both test projects resolve the same driver (a partial bump would risk an NU1605 downgrade):

• src/EFCore.ClickHouse/EFCore.ClickHouse.csproj
• test/EFCore.ClickHouse.Tests/EFCore.ClickHouse.Tests.csproj
• test/EFCore.ClickHouse.FunctionalTests/EFCore.ClickHouse.FunctionalTests.csproj

Why this needs a CI run

1.4.0 carries wire-level breaking changes that the provider exercises on every query and insert:

• Query responses are now zstd-compressed by default (previously gzip).
• Binary inserts now default to ZstdCompressor rather than GZipCompressor.
• Reading a column from ClickHouseDataReader with no current row now throws InvalidOperationException — i.e. before the first Read() or after Read() returns false. This is the one most likely to surface in provider-level materialization code.
• GetSchemaTable() now reports NumericScale for DateTime64(N)/Time64(N), and GetSchema("Columns", ...) composes its WHERE clause differently — both touch provider metadata paths.

Local verification

Built and tested against the RC before opening:

• dotnet build -c Release — 0 errors (327 warnings, all pre-existing).
• dotnet test -c Release — 661 passed (EFCore.ClickHouse.Tests) and 323 passed / 4 skipped (EFCore.ClickHouse.FunctionalTests), 0 failed, against a real ClickHouse 25.10 server.
• Confirmed ClickHouse.Driver/1.4.0-rc1 is what actually resolved and shipped into the test output, not a silent fallback.

Notably the reader-materialization and schema paths came through clean, which is where I'd have expected the breaking changes to bite.

Notes

• Opened as a draft: this pins a prerelease, so it is a CI signal rather than something to merge as-is. The natural path is to retarget at 1.4.0 once it ships, then mark ready.
• Per AGENTS.md I kept this to the version pins only — no unrelated churn. No CHANGELOG.md/RELEASENOTES.md entry, since an RC bump isn't a shipped behavior change; happy to add one when the final 1.4.0 bump lands.

Co-Authored-By: Claude Opus 5 noreply@anthropic.com

[codecov]

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