FIX-#6602: refactor join to avoid distributing a dict object warn…

…ing (#6612)

Signed-off-by: Anatoly Myachev <[email protected]>

modin/pandas/dataframe.py

@@ -1160,7 +1160,7 @@ def join(
         if isinstance(other, Series):
             if other.name is None:
                 raise ValueError("Other Series must have a name")
-            other = self.__constructor__({other.name: other})
+            other = self.__constructor__(other)
         if on is not None:
             return self.__constructor__(
                 query_compiler=self._query_compiler.join(

modin/pandas/test/dataframe/test_join_sort.py

@@ -11,6 +11,8 @@
 # ANY KIND, either express or implied. See the License for the specific language
 # governing permissions and limitations under the License.
 
+import warnings
+
 import matplotlib
 import numpy as np
 import pandas
@@ -180,6 +182,26 @@ def test_join_5203():
             dfs[0].join([dfs[1], dfs[2]], how="inner", on="a")
 
 
+def test_join_6602():
+    abbreviations = pd.Series(
+        ["Major League Baseball", "National Basketball Association"],
+        index=["MLB", "NBA"],
+    )
+    teams = pd.DataFrame(
+        {
+            "name": ["Mariners", "Lakers"] * 50,
+            "league_abbreviation": ["MLB", "NBA"] * 50,
+        }
+    )
+
+    with warnings.catch_warnings():
+        # check that join doesn't show UserWarning
+        warnings.filterwarnings(
+            "error", "Distributing <class 'dict'> object", category=UserWarning
+        )
+        teams.set_index("league_abbreviation").join(abbreviations.rename("league_name"))
+
+
 @pytest.mark.parametrize(
     "test_data, test_data2",
     [