CLN: avoid Block.get_values where it is unnecessary (pandas-dev#32707)

Author: jbrockmendel

pandas/core/internals/blocks.py

@@ -605,7 +605,9 @@ def astype(self, dtype, copy: bool = False, errors: str = "raise"):
 
                 # astype formatting
                 else:
-                    values = self.get_values()
+                    # Because we have neither is_extension nor is_datelike,
+                    #  self.values already has the correct shape
+                    values = self.values
 
             else:
                 values = self.get_values(dtype=dtype)
@@ -663,7 +665,7 @@ def _can_hold_element(self, element: Any) -> bool:
 
     def to_native_types(self, slicer=None, na_rep="nan", quoting=None, **kwargs):
         """ convert to our native types format, slicing if desired """
-        values = self.get_values()
+        values = self.values
 
         if slicer is not None:
             values = values[:, slicer]

pandas/core/internals/concat.py

@@ -217,7 +217,7 @@ def get_reindexed_values(self, empty_dtype, upcasted_na):
             else:
                 # No dtype upcasting is done here, it will be performed during
                 # concatenation itself.
-                values = self.block.get_values()
+                values = self.block.values
 
         if not self.indexers:
             # If there's no indexing to be done, we want to signal outside