ENH: implement efficient sorting methods for SparseArray (argsort/argmin/argmax) · Issue #34197 · pandas-dev/pandas (original) (raw)

xref #27801 (comment)

SparseArray currently does not implement _values_for_argsort or argsort/argmin/argmax` itself, which means it is using the base implementation, which converts the sparse array to a dense numpy array. Room for improvements thus.