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chdb 4.2.0

Requires chdb-core>=26.5.0.

New

  • chdb.agents.ChDBTool (beta/experimental) — the canonical Python agent tool for chDB, and the reference implementation of a cross-language contract (chdb/agents/CONTRACT.md). Query + introspection with engine-enforced read-only (readonly=2, keeps file()/s3()/url() usable), server-side parameter binding, result caps with an explicit truncated flag, error-to-model dispatch, optional query timeout, attach_file, an optional file allowlist, and a Python-only dataframe_query over Python(). A shared conformance fixture keeps other-language bindings in lock-step. The API is beta and may change in a minor release — pin a version if you depend on it.
  • DataStore → ClickHouse writebackto_clickhouse writes an in-memory DataFrame to a ClickHouse server (same- and cross-server).
  • DataStore pandas 3.xpd.col() expressions; lazy metadata (.columns/.dtypes/.shape/.index resolved without materializing).
  • DataStore ergonomicsoutput_format="DataStore" dispatch and mirrored UDF surfaces from chdb-core.

Notes

All additions are backward-compatible. See the merged PRs since v4.1.9 (#561, [#568], [#570], [#584], [#591], [#592], [#594], [#597]).

Source: README.md, updated 2026-07-02