What's Changed

• Remove personal development files by @mlafeldt in https://github.com/duckdb/duckdb-rs/pull/534
• Make config API more ergonomic by @mlafeldt in https://github.com/duckdb/duckdb-rs/pull/535
• Document what Date32 is and how to convert it by @mlafeldt in https://github.com/duckdb/duckdb-rs/pull/539
• Improve column_count error handling and documentation by @mlafeldt in https://github.com/duckdb/duckdb-rs/pull/541
• Fix vscalar feature to depend on vtab-arrow by @mlafeldt in https://github.com/duckdb/duckdb-rs/pull/542
• Fix feature configuration using cargo-hack by @mlafeldt in https://github.com/duckdb/duckdb-rs/pull/545
• Remove features extra_check and column_decltype by @mlafeldt in https://github.com/duckdb/duckdb-rs/pull/548
• Document Cargo features by @mlafeldt in https://github.com/duckdb/duckdb-rs/pull/549
• Remove unused SmallCString implementation by @mlafeldt in https://github.com/duckdb/duckdb-rs/pull/550
• Reproduce issue with produce_arrow_string_view and show fix by @mlafeldt in https://github.com/duckdb/duckdb-rs/pull/552
• Add REPL example by @mlafeldt in https://github.com/duckdb/duckdb-rs/pull/553
• Document available examples by @mlafeldt in https://github.com/duckdb/duckdb-rs/pull/555
• Overhaul README by @mlafeldt in https://github.com/duckdb/duckdb-rs/pull/556
• Add query_one convenience method by @mlafeldt in https://github.com/duckdb/duckdb-rs/pull/559
• Show how to use Rows.and_then and point users to it by @mlafeldt in https://github.com/duckdb/duckdb-rs/pull/560
• Fix memory leak in Value Display implementation by @mlafeldt in https://github.com/duckdb/duckdb-rs/pull/562
• Document linking against libduckdb on macOS and Linux by @mlafeldt in https://github.com/duckdb/duckdb-rs/pull/563
• Remove redundant flush and close calls in Appender Drop by @mlafeldt in https://github.com/duckdb/duckdb-rs/pull/564
• Add test for foreign key constraint validation in Appender by @mlafeldt in https://github.com/duckdb/duckdb-rs/pull/565
• Speed up CI by canceling in-progress runs by @mlafeldt in https://github.com/duckdb/duckdb-rs/pull/566
• Clean up ignored tests by @mlafeldt in https://github.com/duckdb/duckdb-rs/pull/567
• Support passing custom state to scalar functions by @mlafeldt in https://github.com/duckdb/duckdb-rs/pull/558
• Remove broken SAVEPOINT implementation copied from rusqlite by @mlafeldt in https://github.com/duckdb/duckdb-rs/pull/568
• Document how to get column count by @mlafeldt in https://github.com/duckdb/duckdb-rs/pull/569
• Use Rust 1.89.0 by @mlafeldt in https://github.com/duckdb/duckdb-rs/pull/573
• Set minimal supported Rust version to 1.82.0 by @mlafeldt in https://github.com/duckdb/duckdb-rs/pull/572
• Fix or remove links to SQLite by @mlafeldt in https://github.com/duckdb/duckdb-rs/pull/578
• Remove unsupported TransactionBehavior by @mlafeldt in https://github.com/duckdb/duckdb-rs/pull/579
• Expose Transaction::new_unchecked by @mlafeldt in https://github.com/duckdb/duckdb-rs/pull/580
• Bump slab from 0.4.10 to 0.4.11 by @dependabot[bot] in https://github.com/duckdb/duckdb-rs/pull/581
• Pin nightly Rust to fix ASAN CI job by @mlafeldt in https://github.com/duckdb/duckdb-rs/pull/584
• build(libduckdb-sys): sort C++ source files for deterministic builds by @FabioCanedo in https://github.com/duckdb/duckdb-rs/pull/583
• Fix arrow list type to duckdb logical type conversion by @wangrunji0408 in https://github.com/duckdb/duckdb-rs/pull/574
• Update Arrow to v56 by @mlafeldt in https://github.com/duckdb/duckdb-rs/pull/589
• Update DuckDB to v1.4.0 by @mlafeldt in https://github.com/duckdb/duckdb-rs/pull/590

New Contributors

• @FabioCanedo made their first contribution in https://github.com/duckdb/duckdb-rs/pull/583
• @wangrunji0408 made their first contribution in https://github.com/duckdb/duckdb-rs/pull/574

Full Changelog: https://github.com/duckdb/duckdb-rs/compare/v1.3.2...v1.4.0