Backport PR #51732 on branch 2.0.x (CoW: Add property for references …

…to series class) (#51755)

Backport PR #51732: CoW: Add property for references to series class

Co-authored-by: Patrick Hoefler <61934744+phofl@users.noreply.github.com>

pandas/core/internals/construction.py

@@ -567,10 +567,7 @@ def _homogenize(
                 # Forces alignment. No need to copy data since we
                 # are putting it into an ndarray later
                 val = val.reindex(index, copy=False)
-            if isinstance(val._mgr, SingleBlockManager):
-                refs.append(val._mgr._block.refs)
-            else:
-                refs.append(None)
+            refs.append(val._references)
             val = val._values
         else:
             if isinstance(val, dict):

pandas/core/series.py

@@ -34,6 +34,7 @@
     properties,
     reshape,
 )
+from pandas._libs.internals import BlockValuesRefs
 from pandas._libs.lib import (
     is_range_indexer,
     no_default,
@@ -735,6 +736,12 @@ def _values(self):
         """
         return self._mgr.internal_values()
 
+    @property
+    def _references(self) -> BlockValuesRefs | None:
+        if isinstance(self._mgr, SingleArrayManager):
+            return None
+        return self._mgr._block.refs
+
     # error: Decorated property not supported
     @Appender(base.IndexOpsMixin.array.__doc__)  # type: ignore[misc]
     @property