BUG: added finalize to explode, GH28283 (#46629)

Author: songsol1

doc/source/whatsnew/v1.5.0.rst

@@ -618,6 +618,11 @@ Styler
 - Bug when attempting to apply styling functions to an empty DataFrame subset (:issue:`45313`)
 -
 
+Metadata
+^^^^^^^^
+- Fixed metadata propagation in :meth:`DataFrame.explode` (:issue:`28283`)
+-
+
 Other
 ^^^^^
 

pandas/core/frame.py

@@ -8629,7 +8629,7 @@ def explode(
             result.index = self.index.take(result.index)
         result = result.reindex(columns=self.columns, copy=False)
 
-        return result
+        return result.__finalize__(self, method="explode")
 
     def unstack(self, level: Level = -1, fill_value=None):
         """

pandas/tests/generic/test_finalize.py

@@ -154,10 +154,7 @@
         operator.methodcaller("pivot_table", columns="A", aggfunc=["mean", "sum"]),
     ),
     (pd.DataFrame, frame_data, operator.methodcaller("stack")),
-    pytest.param(
-        (pd.DataFrame, frame_data, operator.methodcaller("explode", "A")),
-        marks=not_implemented_mark,
-    ),
+    (pd.DataFrame, frame_data, operator.methodcaller("explode", "A")),
     (pd.DataFrame, frame_mi_data, operator.methodcaller("unstack")),
     pytest.param(
         (