clickhouse-connect v1.8.0rc3

This is the third release candidate for clickhouse-connect 1.8.0. Please test it with your workloads and report any problems.

RC3 brings the Rust release branch up to date with work merged after 1.7.2 and adds further Python/Rust codec parity fixes. The Rust codec remains experimental and opt-in. The Python codec remains
the default. The compiled clickhouse-connect-core wheel is unchanged from RC2 at version 0.1.0.

Installation

Install RC3 with the optional Rust codec:

pip install "clickhouse-connect[rust]==1.8.0rc3"

Or install RC3 with the standard Python codec only:

pip install "clickhouse-connect==1.8.0rc3"

Enable the Rust codec when creating a client:

client = clickhouse_connect.get_client(
    host="...",
    native_codec="rust",
)

Use native_codec="rust_strict" to reject unsupported Rust paths instead of falling back to Python.

What's Changed Since v1.8.0rc2

Rust codec and temporal types

Rust NumPy and Pandas queries now support Time64(0) with second resolution, including nullable, container, Nested, Variant, and typed JSON paths.
Unsupported statically declared Time64 scales now raise the same ProgrammingError under the Rust and Python codecs instead of leaking a KeyError.
Time64 now accepts every server-valid precision from 0 through 9 for parsing, reflection, Native queries, and DataFrame inserts. NumPy and Pandas query output remains limited to scales 0, 3, 6, and 9.
Negative Time64 timedelta inserts and NumPy timedelta magnitudes are now stored correctly. Out-of-range NumPy values are rejected instead of wrapping.
Pandas Timedelta row inserts now follow normal timedelta conversion. Nullable DataFrame columns insert missing values as NULL on Pandas 3.
Dynamic(Time64) retains documented experimental limitations because Dynamic member metadata is erased before driver conversion.

JSON and driver type handling

SQLAlchemy JSON columns can declare typed paths, dynamic path and type limits, and plain or regular-expression skip rules. Alembic autogeneration preserves configured JSON types. Closes #981.
Dynamic type names preserve their max_types argument.
Generic Enum definitions are accepted and canonicalized to Enum8 or Enum16 according to their value range.
Type parsing now handles double-quoted identifiers and quoted string literals consistently.

Native format and connectivity fixes

Source builds no longer swallow unrelated packaging failures and retry them as pure Python builds.
CLICKHOUSE_CONNECT_REQUIRE_C=1 makes extension build failures fatal for CI and redistributable wheels.
CLICKHOUSE_CONNECT_SKIP_CYTHON=1 continues to request an explicit pure-Python build.
Missing Cython outside skip mode now fails clearly, and setting both build flags is rejected. Closes #994.

Please report RC problems at:
https://github.com/ClickHouse/clickhouse-connect/issues

ClickHouse/clickhouse-connect v1.8.0rc3 on GitHub