GH-16758: Fix R shap summary plot

[tomasfryda]

#16758

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[Copilot]

Pull request overview

Fixes h2o.shap_summary_plot() failing when the input data includes a predictor column named id (GH-16758), by avoiding stats::reshape()’s default/generated id column name collision.

Changes:

• Add an internal helper to generate a guaranteed-non-colliding column name.
• Update h2o.shap_summary_plot() to pass a safe idvar into stats::reshape() calls.
• Add regression tests covering both numeric and categorical id predictors.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
h2o-r/h2o-package/R/explain.R	Ensures stats::reshape() uses a non-colliding idvar when reshaping contributions and feature values.
h2o-r/tests/testdir_misc/explain/runit_shap_summary_plot_id_column.R	Adds regression coverage to ensure SHAP summary plotting succeeds when a predictor is named id (numeric and categorical).

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