BUG: Override SparseDataFrame.where method to set _default_fill_value

Author: Licht-T

pandas/core/sparse/frame.py

@@ -334,6 +334,15 @@ def copy(self, deep=True):
         result._default_kind = self._default_kind
         return result
 
+    def where(self, cond, other=np.nan, inplace=False, axis=None, level=None,
+              try_cast=False, raise_on_error=True):
+        result = super(SparseDataFrame, self).where(cond, other,
+                                                    inplace, axis,
+                                                    level, try_cast,
+                                                    raise_on_error)
+        result._default_fill_value = other
+        return result
+
     @property
     def default_fill_value(self):
         return self._default_fill_value