FIX-modin-project#5203: don't raise AttributeError: 'list' object has…

… no attribute '_query_compiler' in 'join' op

Signed-off-by: Anatoly Myachev <anatoly.myachev@intel.com>

modin/pandas/dataframe.py

@@ -41,6 +41,7 @@
 import sys
 from typing import IO, Optional, Union, Iterator, Hashable, Sequence
 import warnings
+from collections import abc
 
 import modin
 from modin.pandas import Categorical
@@ -1335,7 +1336,7 @@ def join(
         """
         Join columns of another ``DataFrame``.
         """
-        if validate is not None:
+        if validate is not None or (on is not None and isinstance(other, abc.Iterable)):
             return self._default_to_pandas(
                 pandas.DataFrame.join,
                 other,

modin/pandas/test/dataframe/test_join_sort.py

@@ -166,6 +166,17 @@ def test_join(test_data, test_data2):
         df_equals(modin_join, pandas_join)
 
 
+def test_join_5203():
+    df1 = pd.DataFrame(np.ones([2, 4]), columns=["a", "b", "c", "d"])
+    df2 = pd.DataFrame(np.ones([2, 4]), columns=["a", "b", "c", "d"])
+    df3 = pd.DataFrame(np.ones([2, 4]), columns=["a", "b", "c", "d"])
+    with pytest.raises(
+        ValueError,
+        match="Joining multiple DataFrames only supported for joining on index",
+    ):
+        df1.join([df2, df3], how="inner", on="a")
+
+
 @pytest.mark.parametrize(
     "test_data, test_data2",
     [