BUG: Create SparseBlock.__init__ to set type information of SparseArray

Author: Licht-T

pandas/core/internals.py

@@ -2632,10 +2632,34 @@ class SparseBlock(NonConsolidatableMixIn, Block):
     is_sparse = True
     is_numeric = True
     _box_to_block_values = False
-    _can_hold_na = True
     _ftype = 'sparse'
     _holder = SparseArray
 
+    def __init__(self, values, placement, ndim=None, fastpath=False, **kwargs):
+        super(SparseBlock, self).__init__(values, placement,
+                                          ndim, fastpath,
+                                          **kwargs)
+
+        dtype = self.values.sp_values.dtype
+
+        if is_float_dtype(dtype):
+            self.is_float = True
+            self._can_hold_na = True
+        elif is_complex_dtype(dtype):
+            self.is_complex = True
+            self._can_hold_na = True
+        elif is_integer_dtype(dtype):
+            self.is_integer = True
+            self._can_hold_na = False
+        elif is_bool_dtype(dtype):
+            self.is_bool = True
+            self._can_hold_na = False
+        elif is_object_dtype(dtype):
+            self.is_object = True
+            self._can_hold_na = True
+        else:
+            self._can_hold_na = False
+
     def coerce_to_target_dtype(self, other, copy=True):
         return super(SparseBlock, self).coerce_to_target_dtype(other, copy)