Fix native UDF toolchain alignment for cuDF main

[nvliyuan]

Fixes #623.

Summary

The native UDF build should stay on cuDF main. The failure was caused by toolchain/dependency mismatch with the libcudf.so used at runtime.

This PR:

• updates RAPIDS CMake from release/26.02 to main
• changes the native UDF Docker default from gcc-toolset-14 to gcc-toolset-13

[greptile-apps]

Greptile Summary

This PR fixes a toolchain/ABI mismatch when building the native UDF against cuDF main by switching the RAPIDS CMake branch from release/26.02 to main and downgrading the Docker default toolset from gcc-toolset-14 to gcc-toolset-13. Both changes are minimal and consistent with the stated goal of keeping the build aligned with the cuDF main runtime library.

Confidence Score: 5/5

Safe to merge — changes are minimal, targeted, and consistent with the stated fix.

Both changes are straightforward: a compiler toolset version bump in the Dockerfile and a branch name update in CMakeLists.txt. No logic, API contracts, or data paths are affected. The dual use of rapids-cmake-branch as both the cmake helper branch and cuDF GIT_TAG was pre-existing behavior, not introduced by this PR. No P0 or P1 findings.

No files require special attention.

Important Files Changed

Filename	Overview
examples/UDF-Examples/RAPIDS-accelerated-UDFs/Dockerfile	Downgrades default gcc-toolset from 14 to 13 and updates copyright year; straightforward toolchain alignment change.
examples/UDF-Examples/RAPIDS-accelerated-UDFs/src/main/cpp/CMakeLists.txt	Switches rapids-cmake-branch from release/26.02 to main; the same variable is reused as the cuDF GIT_TAG in the source-build path, so both now float on main — intentional but creates a reproducibility caveat.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Docker Build\ngcc-toolset-13] --> B[CMake Configure]
    B --> C{USE_PREBUILT_CUDF?}
    C -- ON --> D[Download RAPIDS.cmake\nfrom rapidsai/rapids-cmake @ main]
    C -- OFF --> D
    D --> E[rapids_cpm_init]
    C -- ON --> F[Use prebuilt libcudf.so\nfrom rapids-4-spark jar]
    F --> G[Fetch CCCL + RMM\nvia rapids-cmake @ main]
    C -- OFF --> H[Clone cudf @ main\nvia rapids_cpm_find]
    G --> I[Build udfexamplesjni.so]
    H --> I

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_{Reviews (5): Last reviewed commit: "Fix native UDF toolchain for cuDF main" | Re-trigger Greptile}

[GaryShen2008]

Please update the PR description to explain what it changed. The current description is not correct because we're using the main branch and there's no release/26.06 branch. The #623 is not because of the wrong branch.

[GaryShen2008]

Please confirm with DevOps if the Dockerfile will be rebuilt automatically in the CI.

[nvliyuan]

Please confirm with DevOps if the Dockerfile will be rebuilt automatically in the CI.

yes. CC @NvTimLiu , merged

[NvTimLiu]

Please confirm with DevOps if the Dockerfile will be rebuilt automatically in the CI.

Yes CI will build the UDF Docker image nightly