Support class encoding list-valued columns - #8645
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lindicaphxag-tech wants to merge 1 commit into
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lindicaphxag-tech wants to merge 1 commit into
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Fixes #6267
class_encode_column currently rejects list-valued columns even when the feature is List(Value(...)). That makes multi-label datasets fall back to manually collecting labels and calling cast_column.
This change accepts List(Value(...)) columns, collects class names from the list elements, and maps each element while preserving the outer list structure. Scalar columns keep their existing behavior.
Added a regression test covering repeated labels and empty lists.
Tested locally:
PYTHONPATH=src python -m pytest tests/test_arrow_dataset.py -k class_encode -q
6 passed