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BUG: fix silent DataFrame.melt corruption on var_name collisions#65655

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gautamvarmadatla wants to merge 2 commits into
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gautamvarmadatla:fix-melt-var-name-collision
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BUG: fix silent DataFrame.melt corruption on var_name collisions#65655
gautamvarmadatla wants to merge 2 commits into
pandas-dev:mainfrom
gautamvarmadatla:fix-melt-var-name-collision

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@gautamvarmadatla gautamvarmadatla commented May 15, 2026

Validates that id_vars + var_name + [value_name] produces unique output column names after var_name resolution. Raises ValueError on collisions instead of silently overwriting data, consistent with the existing value_name collision check.

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BUG: DataFrame.melt silently corrupts data on var_name output-name collisions

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