[table] Allowing to show the time grain in table view (#2294)

Explicitely request to show the time grain in the table view as
a checkbox

superset/assets/javascripts/explorev2/stores/controls.jsx

@@ -188,6 +188,13 @@ export const controls = {
                  'displaying the Y scale',
   },
 
+  include_time: {
+    type: 'CheckboxControl',
+    label: 'Include Time',
+    description: 'Whether to include the time granularity as defined in the time section',
+    default: false,
+  },
+
   bar_stacked: {
     type: 'CheckboxControl',
     label: 'Stacked Bars',

superset/assets/javascripts/explorev2/stores/visTypes.js

@@ -236,6 +236,7 @@ const visTypes = {
         description: 'Use this section if you want a query that aggregates',
         controlSetRows: [
           ['groupby', 'metrics'],
+          ['include_time'],
         ],
       },
       {
@@ -259,6 +260,9 @@ const visTypes = {
         default: null,
         validators: null,
       },
+      time_grain_sqla: {
+        default: null,
+      },
     },
   },