BUG: Add SparseArray.all method

Author: Licht-T

pandas/core/sparse/array.py

@@ -605,6 +605,15 @@ def fillna(self, value, downcast=None):
         return self._simple_new(new_values, self.sp_index,
                                 fill_value=fill_value)
 
+    def all(self, axis=0, *args, **kwargs):
+        values = self.sp_values
+
+        if len(values) != len(self):
+            values = values.tolist()
+            values.append(self.fill_value)
+
+        return np.all(values, axis, *args, **kwargs)
+
     def sum(self, axis=0, *args, **kwargs):
         """
         Sum of non-NA/null values