chore: release v0.27.1 (#3125)

Release v0.27.1 -- version bump (0.27.0 -> 0.27.1) and changelog for
`delta_kernel`, `delta_kernel_derive`, and
`delta_kernel_default_engine`.

v0.27.0 was tagged but never published to crates.io (its publish verify
failed on a default-feature build). This release supersedes it: the
changelog folds everything since v0.26.0 into a single v0.27.1 section
(including the commits that landed after v0.27.0 was cut).

Pairs with the compile fix in #3123, which must merge before v0.27.1 is
tagged.

Author: chiinlquah

CHANGELOG.md

@@ -1,8 +1,9 @@
 # Changelog
 
-## [v0.27.0](https://github.com/delta-io/delta-kernel-rs/tree/v0.27.0/) (2026-08-12)
 
-[Full Changelog](https://github.com/delta-io/delta-kernel-rs/compare/v0.26.0...v0.27.0)
+## [v0.27.1](https://github.com/delta-io/delta-kernel-rs/tree/v0.27.1/) (2026-08-14)
+
+[Full Changelog](https://github.com/delta-io/delta-kernel-rs/compare/v0.26.0...v0.27.1)
 
 
 ### 🏗️ Breaking changes
@@ -49,6 +50,14 @@
      protocol/metadata loads), and `crc_versions_behind` goes from a bool to a count. None are
      `#[non_exhaustive]`, so code that constructs or exhaustively matches them needs updating.
      `LogSegmentLoad` and `ProtocolMetadataLoad` now fire on incremental loads too, not just fresh.
+11. Derive `Scalar` from POD structs; infallible `Vec`/`HashMap` conversions ([#3095])
+   - Converting a `Vec` or `HashMap` into `Scalar::Array` / `Scalar::Map` is now infallible (it used to
+     return a `Result`), so drop the `?`/`unwrap` at those call sites. Also adds a proc macro that
+     derives `From<MyStruct> for Scalar`.
+12. Derive macro for populating a struct from a `Scalar` ([#3101])
+   - `StructData::into_values` is replaced by `StructData::into_parts`, which also returns field info, so
+     update callers to `into_parts`. Adds a derive macro for `TryFrom<Scalar>`, round-tripping a struct
+     through `Scalar`.
 
 ### 🚀 Features / new APIs
 
@@ -110,6 +119,10 @@
 56. 3-arg Min/MaxNotNullBy ([#3082])
 57. Define and implement SUM/COUNT aggregates ([#3083])
 58. Initial predicate conversion ([#2971])
+59. Typed Struct and StructPatch expression conversion ([#2972])
+60. Convert MapToStruct expressions to DataFusion ([#2996])
+61. Lower ParseJson to a kernel-delegating scalar UDF ([#3056])
+62. Validate required fields for dv update ([#3026])
 
 ### 🐛 Bug Fixes
 
@@ -134,6 +147,8 @@
 19. Remove version from kernel in datafusion executor ([#3108])
 20. Logical comparison for NULL instead of physical comparison ([#3085])
 21. Read tables with orphaned columnMapping reader feature ([#3097])
+22. Spurious delta acceptance failure due to network connection issues ([#3109])
+23. Fix default-feature build (import CollectInto from crate::utils) ([#3123])
 
 ### 📚 Documentation
 
@@ -158,12 +173,17 @@
 6. Extract unit test utils from `kernel/src/utils.rs` ([#3018])
 7. Move plan construction to `Scan` ([#3039])
 
+### 🧪 Testing
+
+1. Strengthen scan metadata struct columns coverage ([#3053])
+
 ### ⚙️ Chores/CI
 
 1. Split no-declarative-plans tests into a parallel job ([#3038])
 2. Scaffold datafusion-executor crate ([#2928])
 3. Version the UC crates independently at 0.1.0 ([#3062])
 4. Use col! instead of column_expr! ([#3074])
+5. Use col and col_name macros everywhere they make sense ([#3121])
 
 
 [#2860]: https://github.com/delta-io/delta-kernel-rs/pull/2860
@@ -274,6 +294,16 @@
 [#3108]: https://github.com/delta-io/delta-kernel-rs/pull/3108
 [#3085]: https://github.com/delta-io/delta-kernel-rs/pull/3085
 [#3097]: https://github.com/delta-io/delta-kernel-rs/pull/3097
+[#3095]: https://github.com/delta-io/delta-kernel-rs/pull/3095
+[#3101]: https://github.com/delta-io/delta-kernel-rs/pull/3101
+[#2972]: https://github.com/delta-io/delta-kernel-rs/pull/2972
+[#2996]: https://github.com/delta-io/delta-kernel-rs/pull/2996
+[#3056]: https://github.com/delta-io/delta-kernel-rs/pull/3056
+[#3026]: https://github.com/delta-io/delta-kernel-rs/pull/3026
+[#3109]: https://github.com/delta-io/delta-kernel-rs/pull/3109
+[#3053]: https://github.com/delta-io/delta-kernel-rs/pull/3053
+[#3121]: https://github.com/delta-io/delta-kernel-rs/pull/3121
+[#3123]: https://github.com/delta-io/delta-kernel-rs/pull/3123
 
 
 ## [v0.26.0](https://github.com/delta-io/delta-kernel-rs/tree/v0.26.0/) (2026-07-13)

Cargo.lock

@@ -32,4 +32,4 @@ license = "Apache-2.0"
 repository = "https://github.com/delta-io/delta-kernel-rs"
 readme = "README.md"
 rust-version = "1.88"
-version = "0.27.0"
+version = "0.27.1"

Cargo.toml

@@ -59,11 +59,11 @@ built with [Arrow] and [Tokio].
 ```toml
 # fewer dependencies, requires consumer to implement Engine trait.
 # allows consumers to implement their own in-memory format
-delta_kernel = "0.27.0"
+delta_kernel = "0.27.1"
 
 # or pull in the default Arrow/Tokio engine alongside the kernel
-delta_kernel = "0.27.0"
-delta_kernel_default_engine = { version = "0.27.0", features = ["rustls"] }
+delta_kernel = "0.27.1"
+delta_kernel_default_engine = { version = "0.27.1", features = ["rustls"] }
 ```
 
 ### Feature flags

README.md

@@ -16,7 +16,7 @@ pre-release-replacements = [
 ]
 
 [dependencies]
-delta_kernel = { path = "../kernel", version = "0.27.0", features = [
+delta_kernel = { path = "../kernel", version = "0.27.1", features = [
   "default-engine-base",
   "internal-api",
 ] }

datafusion-executor/Cargo.lock

@@ -24,7 +24,7 @@ arrow-58 = ["delta_kernel/arrow-58"]
 integration-test = []
 
 [dependencies]
-delta_kernel = { path = "../kernel", version = "0.27.0", features = ["internal-api"] }
+delta_kernel = { path = "../kernel", version = "0.27.1", features = ["internal-api"] }
 unity-catalog-delta-client-api = { path = "../unity-catalog-delta-client-api", version = "0.1.0" }
 serde_json = "1.0"
 tokio = { version = "1", features = ["full"] }

default-engine/Cargo.toml

@@ -29,7 +29,7 @@ delta_kernel = { path = "../kernel", default-features = false, features = [
   "internal-api",
 ] }
 delta_kernel_default_engine = { path = "../default-engine", default-features = false, optional = true }
-delta_kernel_ffi_macros = { path = "../ffi-proc-macros", version = "0.27.0" }
+delta_kernel_ffi_macros = { path = "../ffi-proc-macros", version = "0.27.1" }
 delta-kernel-unity-catalog = { path = "../delta-kernel-unity-catalog", optional = true }
 unity-catalog-delta-client-api = { path = "../unity-catalog-delta-client-api", optional = true }
 

delta-kernel-unity-catalog/Cargo.toml

@@ -39,7 +39,7 @@ pre-release-hook = [
 ]
 
 [dependencies]
-delta_kernel_derive = { path = "../derive-macros", version = "0.27.0" }
+delta_kernel_derive = { path = "../derive-macros", version = "0.27.1" }
 bytes = "1.10"
 chrono = "0.4.41"
 crc = "3.2.2"