Merge branch 'main' into fix_348

Author: dougbrn

src/nested_pandas/nestedframe/core.py

@@ -1876,7 +1876,8 @@ def reduce(self, func, *args, infer_nesting=True, append_columns=False, **kwargs
                 nested_col = pack_lists(rename_df, name=layer)
                 results_nf = results_nf[
                     [col for col in results_nf.columns if not col.startswith(f"{layer}.")]
-                ].join(nested_col)
+                ]
+                results_nf[layer] = nested_col
 
         if append_columns:
             # Append the results to the original NestedFrame

tests/nested_pandas/nestedframe/test_nestedframe.py

@@ -2209,3 +2209,12 @@ def test_issue348():
         name="new",
     )
     assert isinstance(new, NestedFrame)
+
+
+def test_issue350():
+    """https://github.com/lincc-frameworks/nested-pandas/issues/350"""
+    nf = generate_data(3, 2)
+    nf = nf.set_index(np.array([100, 100, 101]))
+    result = nf.reduce(lambda flux: {"new.flux": flux}, "nested.flux")
+    assert len(result) == 3
+