Misc cleanups for error handling, naming/signatures, and partitioning in skill templates [skip ci]

[rishic3]

Description

This is a follow-up to address a few comments on #15058.

• (comment) - executeGpu now closes its result internally and returns void
• (comment) - no longer catching write errors and letting it throw (more easily reviewable with whitespace off)
• (comment) - rename verifyUDFResults -> assertUDFResults to clarify that this calls assertions
• (comment) - bumped to repartition(2) and encouraging 10+ test cases, for more realistic parallelism while ensuring the UDF is actually fed multi-row columns

Checklists

Documentation

• Updated for new or modified user-facing features or behaviors
• No user-facing change

Testing

• Added or modified tests to cover new code paths
• Covered by existing tests
  (Please provide the names of the existing tests in the PR description.)
• Not required

Performance

• Tests ran and results are added in the PR description
• Issue filed with a link in the PR description
• Not required

[Copilot]

Pull request overview

Follow-up cleanup to the UDF skill templates to align with prior review feedback: clarify naming/signatures, tighten resource ownership expectations, and encourage more realistic test partitioning.

Changes:

• Renamed verifyUDFResults → assertUDFResults across templates/docs to reflect assertion semantics.
• Updated Scala test templates to use repartition(2) to better exercise multi-row columnar execution paths.
• Adjusted benchmark template error/report handling and clarified GPU benchmark resource-lifecycle expectations (executeGpu closes its result and returns Unit).

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
skills/udf-judge-conversion/SKILL.md	Updates judge guidance to reference assertUDFResults instead of verifyUDFResults.
skills/udf-gen-test/templates/scala/src/test/scala/com/udf/UnitTest.scala	Renames results-check helper, updates TODO guidance, and changes repartitioning to 2.
skills/udf-gen-test/templates/scala/src/test/scala/com/udf/SqlComparisonTest.scala	Updates to assertUDFResults and uses repartition(2) for test input.
skills/udf-gen-test/templates/scala/src/test/scala/com/udf/CudfComparisonTest.scala	Updates to assertUDFResults and uses repartition(2) for test input.
skills/udf-gen-test/templates/scala/src/main/scala/com/udf/bench/SparkBenchRunner.scala	Stops swallowing report-write exceptions; report writing failures now propagate.
skills/udf-gen-test/templates/scala/src/main/scala/com/udf/bench/MicroBenchRunner.scala	Changes executeGpu to Unit and updates docs/call site to reflect internal close of the GPU result.

[rishic3]

build

[greptile-apps]

Greptile Summary

This is a housekeeping follow-up that addresses code-review comments from PR #15058, touching only the skill template files and the judge SKILL.md — no production plugin code is changed.

• executeGpu in MicroBenchRunner now returns Unit and closes the ColumnVector internally via withResource, removing the burden from the call site.
• writeReport in SparkBenchRunner no longer silently swallows write errors; they propagate as exceptions.
• verifyUDFResults is renamed to assertUDFResults consistently across the three test templates and SKILL.md.
• All three test templates bump repartition(1) → repartition(2) and add guidance to include 10+ test cases for more realistic multi-row coverage.

Confidence Score: 4/5

Safe to merge; all changes are in skill template files with no impact on the production Spark plugin. The one nuance worth a follow-up is how write errors in the success path are reported.

The rename, repartition bump, and executeGpu void-return changes are clean and consistent across all template files. The removal of the silent write-error catch in SparkBenchRunner is an improvement in visibility, but it creates a path where a successful benchmark run can exit with failure status if the JSON write fails — the outer catch handler will log it as a benchmark failure and write an error report rather than surfacing just the write problem.

skills/udf-gen-test/templates/scala/src/main/scala/com/udf/bench/SparkBenchRunner.scala — the success-path writeReport call now sits inside the try block that feeds the error handler.

Important Files Changed

Filename	Overview
skills/udf-gen-test/templates/scala/src/main/scala/com/udf/bench/SparkBenchRunner.scala	Removed try/catch that silently swallowed write errors in writeReport; exceptions now propagate. A write failure in the success path will be caught by the outer catch block, causing the run to exit with failure status even though the benchmark itself succeeded.
skills/udf-gen-test/templates/scala/src/main/scala/com/udf/bench/MicroBenchRunner.scala	executeGpu changed to return Unit and close its ColumnVector internally; call site cleaned up. Resource lifecycle is now correctly managed.
skills/udf-gen-test/templates/scala/src/test/scala/com/udf/UnitTest.scala	verifyUDFResults renamed to assertUDFResults; repartition(1) bumped to repartition(2) with explanatory comment and 10+ test case guidance added.
skills/udf-gen-test/templates/scala/src/test/scala/com/udf/CudfComparisonTest.scala	Call sites updated to assertUDFResults; repartition(2) with comment. Straightforward rename.
skills/udf-gen-test/templates/scala/src/test/scala/com/udf/SqlComparisonTest.scala	Call sites updated to assertUDFResults; repartition(2) with comment. Straightforward rename.
skills/udf-judge-conversion/SKILL.md	Single reference to verifyUDFResults updated to assertUDFResults to stay in sync with the renamed template method.

Sequence Diagram

%%{init: {'theme': 'neutral'}}%%
sequenceDiagram
    participant Main as SparkBenchRunner.main
    participant Job as Spark Job
    participant WR as writeReport
    participant EH as catch(Exception)

    Main->>Job: execute benchmark
    Job-->>Main: success / elapsed
    Main->>WR: "writeReport(status=success)"
    alt write succeeds
        WR-->>Main: ok
        Main->>Main: sys.exit(0)
    else write throws IOException
        WR-->>EH: IOException (caught by outer catch)
        EH->>WR: "writeReport(status=error)"
        EH->>Main: sys.exit(1)
        Note over EH,Main: benchmark was successful but exits with failure
    end

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sequenceDiagram
    participant Main as SparkBenchRunner.main
    participant Job as Spark Job
    participant WR as writeReport
    participant EH as catch(Exception)

    Main->>Job: execute benchmark
    Job-->>Main: success / elapsed
    Main->>WR: "writeReport(status=success)"
    alt write succeeds
        WR-->>Main: ok
        Main->>Main: sys.exit(0)
    else write throws IOException
        WR-->>EH: IOException (caught by outer catch)
        EH->>WR: "writeReport(status=error)"
        EH->>Main: sys.exit(1)
        Note over EH,Main: benchmark was successful but exits with failure
    end

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Comments Outside Diff (1)

1. skills/udf-gen-test/templates/scala/src/main/scala/com/udf/bench/SparkBenchRunner.scala, line 55-98 (link)

   Write failure mis-reports a successful benchmark run as an error

   With the try/catch removed, a successful benchmark (lines 57–61 complete fine) that then hits an IOException during writeReport will be caught by the outer case e: Exception handler. The handler logs "Benchmark run failed", writes an error report with status = "error", and calls sys.exit(1) — even though the benchmark itself finished successfully. The original silent-swallow was admittedly wrong, but letting the exception escape the success block into the error handler misattributes the cause. Moving writeReport outside the try/catch (so it propagates unconditionally rather than into the error handler) or re-catching specifically in the success block would prevent the false-failure report.

_{Reviews (1): Last reviewed commit: "add a trailing comma" | Re-trigger Greptile}

[wjxiz1992]

good practices, LGTM!

[abellina]

Thanks @rishic3 this looks good