Use pandas testing utils for exact cases.

databricks/koalas/base.py

@@ -212,10 +212,10 @@ def __sub__(self, other):
             )
             if isinstance(other, IndexOpsMixin) and isinstance(other.spark.data_type, DateType):
                 warnings.warn(msg, UserWarning)
-                return column_op(F.datediff)(self, other)
+                return column_op(F.datediff)(self, other).astype("bigint")
             elif isinstance(other, datetime.date) and not isinstance(other, datetime.datetime):
                 warnings.warn(msg, UserWarning)
-                return column_op(F.datediff)(self, F.lit(other))
+                return column_op(F.datediff)(self, F.lit(other)).astype("bigint")
             else:
                 raise TypeError("date subtraction can only be applied to date series.")
         return column_op(Column.__sub__)(self, other)
@@ -286,7 +286,7 @@ def __rsub__(self, other):
             )
             if isinstance(other, datetime.date) and not isinstance(other, datetime.datetime):
                 warnings.warn(msg, UserWarning)
-                return -column_op(F.datediff)(self, F.lit(other))
+                return -column_op(F.datediff)(self, F.lit(other)).astype("bigint")
             else:
                 raise TypeError("date subtraction can only be applied to date series.")
         return column_op(Column.__rsub__)(self, other)

databricks/koalas/frame.py

@@ -2093,10 +2093,18 @@ def transpose(self):
 
         internal = self._internal.copy(
             spark_frame=transposed_df,
-            index_map=OrderedDict((col, None) for col in internal_index_columns),
+            index_map=OrderedDict(
+                (col, name if name is None or isinstance(name, tuple) else (name,))
+                for col, name in zip(
+                    internal_index_columns,
+                    self._internal.column_label_names
+                    if self._internal.column_label_names is not None
+                    else ([None] * len(internal_index_columns)),
+                )
+            ),
             column_labels=[tuple(json.loads(col)["a"]) for col in new_data_columns],
             data_spark_columns=[scol_for(transposed_df, col) for col in new_data_columns],
-            column_label_names=None,
+            column_label_names=self._internal.index_names,
         )
 
         return DataFrame(internal)

databricks/koalas/testing/utils.py

@@ -133,27 +133,46 @@ def tearDownClass(cls):
 
     def assertPandasEqual(self, left, right):
         if isinstance(left, pd.DataFrame) and isinstance(right, pd.DataFrame):
-            msg = (
-                "DataFrames are not equal: "
-                + "\n\nLeft:\n%s\n%s" % (left, left.dtypes)
-                + "\n\nRight:\n%s\n%s" % (right, right.dtypes)
-            )
-            self.assertTrue(left.equals(right), msg=msg)
+            try:
+                pd.util.testing.assert_frame_equal(
+                    left,
+                    right,
+                    check_index_type=("equiv" if len(left.index) > 0 else False),
+                    check_column_type=("equiv" if len(left.columns) > 0 else False),
+                    check_exact=True,
+                )
+            except AssertionError as e:
+                msg = (
+                    str(e)
+                    + "\n\nLeft:\n%s\n%s" % (left, left.dtypes)
+                    + "\n\nRight:\n%s\n%s" % (right, right.dtypes)
+                )
+                raise AssertionError(msg) from e
         elif isinstance(left, pd.Series) and isinstance(right, pd.Series):
-            msg = (
-                "Series are not equal: "
-                + "\n\nLeft:\n%s\n%s" % (left, left.dtype)
-                + "\n\nRight:\n%s\n%s" % (right, right.dtype)
-            )
-            self.assertEqual(str(left.name), str(right.name), msg=msg)
-            self.assertTrue((left == right).all(), msg=msg)
+            try:
+                pd.util.testing.assert_series_equal(
+                    left,
+                    right,
+                    check_index_type=("equiv" if len(left.index) > 0 else False),
+                    check_exact=True,
+                )
+            except AssertionError as e:
+                msg = (
+                    str(e)
+                    + "\n\nLeft:\n%s\n%s" % (left, left.dtype)
+                    + "\n\nRight:\n%s\n%s" % (right, right.dtype)
+                )
+                raise AssertionError(msg) from e
         elif isinstance(left, pd.Index) and isinstance(right, pd.Index):
-            msg = (
-                "Indices are not equal: "
-                + "\n\nLeft:\n%s\n%s" % (left, left.dtype)
-                + "\n\nRight:\n%s\n%s" % (right, right.dtype)
-            )
-            self.assertTrue((left == right).all(), msg=msg)
+            try:
+                pd.util.testing.assert_index_equal(left, right, check_exact=True)
+            except AssertionError as e:
+                msg = (
+                    str(e)
+                    + "\n\nLeft:\n%s\n%s" % (left, left.dtype)
+                    + "\n\nRight:\n%s\n%s" % (right, right.dtype)
+                )
+                raise AssertionError(msg) from e
         else:
             raise ValueError("Unexpected values: (%s, %s)" % (left, right))
 
@@ -190,6 +209,15 @@ def assertPandasAlmostEqual(self, left, right):
                 self.assertEqual(lnull, rnull, msg=msg)
             for lval, rval in zip(left.dropna(), right.dropna()):
                 self.assertAlmostEqual(lval, rval, msg=msg)
+        elif isinstance(left, pd.MultiIndex) and isinstance(left, pd.MultiIndex):
+            msg = (
+                "MultiIndices are not almost equal: "
+                + "\n\nLeft:\n%s\n%s" % (left, left.dtype)
+                + "\n\nRight:\n%s\n%s" % (right, right.dtype)
+            )
+            self.assertEqual(len(left), len(right), msg=msg)
+            for lval, rval in zip(left, right):
+                self.assertAlmostEqual(lval, rval, msg=msg)
         elif isinstance(left, pd.Index) and isinstance(left, pd.Index):
             msg = (
                 "Indices are not almost equal: "

databricks/koalas/tests/test_dataframe.py

@@ -567,7 +567,7 @@ def mul10(x) -> int:
 
     def test_dot_in_column_name(self):
         self.assert_eq(
-            ks.DataFrame(ks.range(1)._internal.spark_frame.selectExpr("1 as `a.b`"))["a.b"],
+            ks.DataFrame(ks.range(1)._internal.spark_frame.selectExpr("1L as `a.b`"))["a.b"],
             ks.Series([1], name="a.b"),
         )
 
@@ -665,7 +665,7 @@ def _test_dropna(self, pdf, axis):
         pdf2.dropna(inplace=True)
         kdf2.dropna(inplace=True)
         self.assert_eq(kdf2, pdf2)
-        self.assert_eq(kser, pser, almost=True)
+        self.assert_eq(kser, pser)
 
         # multi-index
         columns = pd.MultiIndex.from_tuples([("a", "x"), ("a", "y"), ("b", "z")])
@@ -805,7 +805,7 @@ def test_fillna(self):
         pdf.fillna({"x": -1, "y": -2, "z": -5}, inplace=True)
         kdf.fillna({"x": -1, "y": -2, "z": -5}, inplace=True)
         self.assert_eq(kdf, pdf)
-        self.assert_eq(kser, pser, almost=True)
+        self.assert_eq(kser, pser)
 
         s_nan = pd.Series([-1, -2, -5], index=["x", "y", "z"], dtype=int)
         self.assert_eq(kdf.fillna(s_nan), pdf.fillna(s_nan))
@@ -942,7 +942,7 @@ def test_sort_values(self):
         kserA = kdf.a
         self.assert_eq(kdf.sort_values("b", inplace=True), pdf.sort_values("b", inplace=True))
         self.assert_eq(kdf, pdf)
-        self.assert_eq(kserA, pserA, almost=True)
+        self.assert_eq(kserA, pserA)
 
         columns = pd.MultiIndex.from_tuples([("X", "A"), ("X", "B")])
         kdf.columns = columns
@@ -975,7 +975,7 @@ def test_sort_index(self):
         kserA = kdf.A
         self.assertEqual(kdf.sort_index(inplace=True), pdf.sort_index(inplace=True))
         self.assert_eq(kdf, pdf)
-        self.assert_eq(kserA, pserA, almost=True)
+        self.assert_eq(kserA, pserA)
 
         # Assert multi-indices
         pdf = pd.DataFrame(
@@ -1759,7 +1759,7 @@ def get_data(left_columns=None, right_columns=None):
         left_pdf.update(right_pdf)
         left_kdf.update(right_kdf)
         self.assert_eq(left_pdf.sort_values(by=["A", "B"]), left_kdf.sort_values(by=["A", "B"]))
-        self.assert_eq(kser.sort_index(), pser.sort_index(), almost=True)
+        self.assert_eq(kser.sort_index(), pser.sort_index())
 
         left_kdf, left_pdf, right_kdf, right_pdf = get_data()
         left_pdf.update(right_pdf, overwrite=False)
@@ -2063,7 +2063,7 @@ def test_stack(self):
         )
         kdf = ks.from_pandas(pdf)
 
-        self.assert_eq(kdf.stack().sort_index(), pdf.stack().sort_index(), almost=True)
+        self.assert_eq(kdf.stack().sort_index(), pdf.stack().sort_index())
         self.assert_eq(kdf[[]].stack().sort_index(), pdf[[]].stack().sort_index(), almost=True)
 
     def test_unstack(self):
@@ -3346,10 +3346,10 @@ def test_query(self):
             kdf.query("('A', 'Z') > ('B', 'X')")
 
     def test_take(self):
-        kdf = ks.DataFrame(
+        pdf = pd.DataFrame(
             {"A": range(0, 50000), "B": range(100000, 0, -2), "C": range(100000, 50000, -1)}
         )
-        pdf = kdf.to_pandas()
+        kdf = ks.from_pandas(pdf)
 
         # axis=0 (default)
         self.assert_eq(kdf.take([1, 2]).sort_index(), pdf.take([1, 2]).sort_index())
@@ -3422,6 +3422,7 @@ def test_take(self):
         self.assert_eq(
             kdf.take(range(-1, -3), axis=1).sort_index(),
             pdf.take(range(-1, -3), axis=1).sort_index(),
+            almost=True,
         )
         self.assert_eq(
             kdf.take([2, 1], axis=1).sort_index(), pdf.take([2, 1], axis=1).sort_index(),
@@ -3539,7 +3540,7 @@ def test_squeeze(self):
         axises = [None, 0, 1, "rows", "index", "columns"]
 
         # Multiple columns
-        pdf = pd.DataFrame([[1, 2], [3, 4]], columns=["a", "b"])
+        pdf = pd.DataFrame([[1, 2], [3, 4]], columns=["a", "b"], index=["x", "y"])
         kdf = ks.from_pandas(pdf)
         for axis in axises:
             self.assert_eq(pdf.squeeze(axis), kdf.squeeze(axis))
@@ -3551,7 +3552,7 @@ def test_squeeze(self):
             self.assert_eq(pdf.squeeze(axis), kdf.squeeze(axis))
 
         # Single column with single value
-        pdf = pd.DataFrame([[1]], columns=["a"])
+        pdf = pd.DataFrame([[1]], columns=["a"], index=["x"])
         kdf = ks.from_pandas(pdf)
         for axis in axises:
             self.assert_eq(pdf.squeeze(axis), kdf.squeeze(axis))
@@ -3864,15 +3865,15 @@ def test_iteritems(self):
 
     def test_tail(self):
         if LooseVersion(pyspark.__version__) >= LooseVersion("3.0"):
-            pdf = pd.DataFrame(range(1000))
+            pdf = pd.DataFrame({"x": range(1000)})
             kdf = ks.from_pandas(pdf)
 
-            self.assert_eq(pdf.tail(), kdf.tail(), almost=True)
-            self.assert_eq(pdf.tail(10), kdf.tail(10), almost=True)
-            self.assert_eq(pdf.tail(-990), kdf.tail(-990), almost=True)
-            self.assert_eq(pdf.tail(0), kdf.tail(0), almost=True)
-            self.assert_eq(pdf.tail(-1001), kdf.tail(-1001), almost=True)
-            self.assert_eq(pdf.tail(1001), kdf.tail(1001), almost=True)
+            self.assert_eq(pdf.tail(), kdf.tail())
+            self.assert_eq(pdf.tail(10), kdf.tail(10))
+            self.assert_eq(pdf.tail(-990), kdf.tail(-990))
+            self.assert_eq(pdf.tail(0), kdf.tail(0))
+            self.assert_eq(pdf.tail(-1001), kdf.tail(-1001))
+            self.assert_eq(pdf.tail(1001), kdf.tail(1001))
             with self.assertRaisesRegex(TypeError, "bad operand type for unary -: 'str'"):
                 kdf.tail("10")