BUG: Simplify fill_value check in SparseArray.all

Author: Licht-T

pandas/core/sparse/array.py

@@ -626,9 +626,8 @@ def all(self, axis=0, *args, **kwargs):
 
         values = self.sp_values
 
-        if len(values) != len(self):
-            values = values.tolist()
-            values.append(self.fill_value)
+        if len(values) != len(self) and not np.all(self.fill_value):
+            return False
 
         return np.all(values, axis, *args, **kwargs)