[FIX] Pivot: Output date for group by table

Orange/widgets/data/owpivot.py

@@ -14,7 +14,7 @@
                              QGridLayout)
 
 from Orange.data import (Table, DiscreteVariable, Variable, Domain,
-                         ContinuousVariable)
+                         ContinuousVariable, TimeVariable)
 from Orange.data.domain import filter_visible
 from Orange.data.util import get_unique_names_duplicates, get_unique_names
 from Orange.data.filter import FilterContinuous, FilterDiscrete, Values
@@ -67,6 +67,7 @@ class Pivot:
     AnyVarFunctions = (Count_defined,)
     ContVarFunctions = (Sum, Mean, Min, Max, Mode, Median, Var)
     DiscVarFunctions = (Majority,)
+    TimeVarFunctions = (Mean, Min, Max, Mode, Median)
 
     class Tables:
         table = None  # type: Table
@@ -195,7 +196,12 @@ def _create_group_tables(self, var_indep_funs, var_dep_funs):
             if fun in self.DiscVarFunctions:
                 attrs.append(DiscreteVariable(name, var.values))
             else:
-                attrs.append(ContinuousVariable(name))
+                if isinstance(var, TimeVariable) and \
+                        fun in self.TimeVarFunctions:
+                    attrs.append(TimeVariable(name, have_date=var.have_date,
+                                              have_time=var.have_time))
+                else:
+                    attrs.append(ContinuousVariable(name))
         args = (var_indep_funs, var_dep_funs, attrs)
         for t, var in (("table", None), ("total_h", self._col_var),
                        ("total_v", self._row_var), ("total", self._total_var)):

Orange/widgets/data/tests/test_owpivot.py

@@ -10,7 +10,8 @@
 from AnyQt.QtTest import QTest
 
 from Orange.data import (Table, Domain, ContinuousVariable as Cv,
-                         StringVariable as sv, DiscreteVariable as Dv)
+                         StringVariable as sv, DiscreteVariable as Dv,
+                         TimeVariable as Tv)
 from Orange.widgets.data.owpivot import (OWPivot, Pivot,
                                          AggregationFunctionsEnum)
 from Orange.widgets.tests.base import WidgetTest
@@ -68,6 +69,16 @@ def test_output_grouped_data(self):
         self.send_signal(self.widget.Inputs.data, None)
         self.assertIsNone(self.get_output(self.widget.Outputs.grouped_data))
 
+    def test_output_grouped_data_time_var(self):
+        domain = Domain([Dv("d1", ("a", "b")), Tv("t1", have_date=1)])
+        X = np.array([[0, 1e9], [0, 1e8], [1, 2e8], [1, np.nan]])
+        data = Table(domain, X)
+        self.send_signal(self.widget.Inputs.data, data)
+        self.agg_checkboxes[Pivot.Functions.Mean.value].click()
+        grouped = self.get_output(self.widget.Outputs.grouped_data)
+        str_grouped = "[[a, 2, 1987-06-06],\n [b, 2, 1976-05-03]]"
+        self.assertEqual(str(grouped), str_grouped)
+
     def test_output_filtered_data(self):
         self.agg_checkboxes[Pivot.Functions.Sum.value].click()
         self.send_signal(self.widget.Inputs.data, self.iris)
@@ -333,6 +344,18 @@ def test_group_table(self):
              [1, 2, 1, 1, 1, 1, 2, 1, 7, 7, 7, 7, 7, 7, 0]])
         self.assert_table_equal(group_tab, Table(Domain(domain[:2] + atts), X))
 
+    def test_group_table_time_var(self):
+        domain = Domain([Dv("d1", ("a", "b")), Tv("t1", have_date=1)])
+        X = np.array([[0, 1e9], [0, 1e8], [1, 2e8], [1, np.nan]])
+        table = Table(domain, X)
+        pivot = Pivot(table, Pivot.Functions, domain[0], val_var=domain[1])
+        str_grouped = \
+            "[[a, 2, 2, a, 2, 1.1e+09, 1987-06-06, 1973-03-03, " \
+            "2001-09-09, 1973-03-03, 1987-06-06, 2.025e+17],\n " \
+            "[b, 2, 2, b, 1, 2e+08, 1976-05-03, 1976-05-03, " \
+            "1976-05-03, 1976-05-03, 1976-05-03, 0]]"
+        self.assertEqual(str(pivot.group_table), str_grouped)
+
     def test_group_table_metas(self):
         domain = Domain([Dv("d1", ("a", "b")), Cv("c1"),
                          Dv("d2", ("a", "b")), Cv("c2")])