Update CMake to 4.0

[NvTimLiu]

To fix build cuDF cmake version error

[INFO]      [exec] CMake Error at /home/jenkins/agent/workspace/jenkins-examples-udf-examples-native-597/examples/UDF-Examples/RAPIDS-accelerated-UDFs/target/cpp-build/_deps/cudf-src/cpp/CMakeLists.txt:8 (cmake_minimum_required):
[INFO]      [exec]   CMake 4.0 or higher is required.  You are running version 3.30.4

Refer to NVIDIA/cudf-spark-jni#4557

This commit updates CMakeLists.txt to use CMake 4.0+, and updates the Dockerfile used in the build.

This is in line with the changes in cuDF, in rapidsai/cudf#22492.

[greptile-apps]

Greptile Summary

This PR fixes a build failure caused by the upstream cuDF project now requiring CMake 4.0 or higher, updating both the Dockerfile and the project's own cmake_minimum_required declaration to satisfy that constraint.

• Dockerfile: The installed CMake binary is bumped from 3.30.4 to 4.0.3; the download URL is generated dynamically from CMAKE_VERSION, so no other lines need to change.
• CMakeLists.txt: cmake_minimum_required is raised from VERSION 3.30.4 to VERSION 4.0, matching the minimum enforced by the fetched cuDF CMakeLists.txt.

Confidence Score: 5/5

Safe to merge; both changes are mechanical version bumps that directly unblock the broken build.

The two changes are a single-line version bump in the Dockerfile and a matching cmake_minimum_required update in CMakeLists.txt. Both track the upstream cuDF change and carry no functional risk. The only note is a stale inline comment, which is a cosmetic issue.

No files require special attention; both changed files are straightforward build-configuration updates.

Important Files Changed

Filename	Overview
examples/UDF-Examples/RAPIDS-accelerated-UDFs/Dockerfile	Bumps the installed CMake binary from 3.30.4 to 4.0.3 to satisfy the updated cuDF requirement; a stale version comment still references 3.22.3.
examples/UDF-Examples/RAPIDS-accelerated-UDFs/src/main/cpp/CMakeLists.txt	Raises cmake_minimum_required from 3.30.4 to 4.0, matching the minimum version now enforced by the upstream cuDF CMakeLists.txt.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Docker build] -->|downloads| B["CMake 4.0.3 binary\n(was 3.30.4)"]
    B --> C[Container image with CMake 4.0.3]
    C --> D[Maven UDF native build]
    D --> E["CMakeLists.txt\ncmake_minimum_required(VERSION 4.0)"]
    E --> F{Fetch cuDF via CPM}
    F -->|cuDF CMakeLists.txt requires CMake 4.0| G[✓ Version satisfied — build proceeds]
    F -->|old CMake 3.30.4| H[✗ CMake Error: 4.0 or higher required]

Loading

_{Reviews (1): Last reviewed commit: "Update CMake to 4.0" | Re-trigger Greptile}

[Copilot]

Pull request overview

Updates the RAPIDS-accelerated UDF native build configuration to meet cuDF’s new requirement for CMake 4.0+, unblocking builds that currently fail due to running CMake 3.30.4.

Changes:

• Bump cmake_minimum_required to CMake 4.0 in the native UDF CMake project.
• Update the UDF build Dockerfile to install CMake 4.0.3.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
examples/UDF-Examples/RAPIDS-accelerated-UDFs/src/main/cpp/CMakeLists.txt	Raises the minimum required CMake version to 4.0 to align with cuDF requirements.
examples/UDF-Examples/RAPIDS-accelerated-UDFs/Dockerfile	Updates the pinned CMake version used in the build container to 4.0.3.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[res-life]

LGTM

[res-life]

Thanks Tim to fix this.