Function min_categorical_array 

pub fn min_categorical_array<T: Integer>(
    window: CategoricalAVT<'_, T>,
) -> Option<String>

Finds the lexicographically minimum dictionary string in a categorical array window.

Scans through a windowed portion of a categorical array, resolves dictionary values, and determines the minimum string according to lexicographic ordering.

Parameters

• window: Categorical array view tuple (CategoricalArray, offset, length) defining the scan window

Returns

Option<String> containing the minimum dictionary string, or None if all values are null.