Adding option to visualize negative values in Table view

superset/assets/backendSync.json

@@ -2214,6 +2214,20 @@
       "default": false,
       "description": "Whether to apply filter when table cell is clicked"
     },
+    "align_pn": {
+      "type": "CheckboxControl",
+      "label": "Align +/-",
+      "renderTrigger": true,
+      "default": false,
+      "description": "Whether to align the background chart for +/- values"
+    },
+    "color_pn": {
+      "type": "CheckboxControl",
+      "label": "Color +/-",
+      "renderTrigger": true,
+      "default": true,
+      "description": "Whether to color +/- values"
+    },
     "show_bubbles": {
       "type": "CheckboxControl",
       "label": "Show Bubbles",
@@ -2974,4 +2988,4 @@
       "description": "Partitions whose height to parent height proportions are below this value are pruned"
     }
   }
-}
+}

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

@@ -1325,6 +1325,22 @@ export const controls = {
     description: t('Whether to apply filter when table cell is clicked'),
   },
 
+  align_pn: {
+    type: 'CheckboxControl',
+    label: t('Align +/-'),
+    renderTrigger: true,
+    default: false,
+    description: t('Whether to align the background chart for +/- values'),
+  },
+
+  color_pn: {
+    type: 'CheckboxControl',
+    label: t('Color +/-'),
+    renderTrigger: true,
+    default: true,
+    description: t('Whether to color +/- values'),
+  },
+
   show_bubbles: {
     type: 'CheckboxControl',
     label: t('Show Bubbles'),

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

@@ -770,6 +770,7 @@ export const visTypes = {
           ['table_timestamp_format'],
           ['row_limit', 'page_length'],
           ['include_search', 'table_filter'],
+          ['align_pn', 'color_pn'],
         ],
       },
     ],

superset/assets/visualizations/table.js

@@ -30,8 +30,14 @@ function tableVis(slice, payload) {
     return arr;
   }
   const maxes = {};
+  const mins = {};
   for (let i = 0; i < metrics.length; i += 1) {
-    maxes[metrics[i]] = d3.max(col(metrics[i]));
+    if (fd.align_pn) {
+      maxes[metrics[i]] = d3.max(col(metrics[i]).map(Math.abs));
+    } else {
+      maxes[metrics[i]] = d3.max(col(metrics[i]));
+      mins[metrics[i]] = d3.min(col(metrics[i]));
+    }
   }
 
   const tsFormatter = d3TimeFormatPreset(fd.table_timestamp_format);
@@ -100,12 +106,27 @@ function tableVis(slice, payload) {
     .append('td')
     .style('background-image', function (d) {
       if (d.isMetric) {
-        const perc = Math.round((d.val / maxes[d.col]) * 100);
+        const r = (fd.color_pn && d.val < 0) ? 150 : 0;
+        if (fd.align_pn) {
+          const perc = Math.abs(Math.round((d.val / maxes[d.col]) * 100));
+          // The 0.01 to 0.001 is a workaround for what appears to be a
+          // CSS rendering bug on flat, transparent colors
+          return (
+            `linear-gradient(to right, rgba(${r},0,0,0.2), rgba(${r},0,0,0.2) ${perc}%, ` +
+            `rgba(0,0,0,0.01) ${perc}%, rgba(0,0,0,0.001) 100%)`
+          );
+        }
+        const posExtent = Math.abs(Math.max(maxes[d.col], 0));
+        const negExtent = Math.abs(Math.min(mins[d.col], 0));
+        const tot = posExtent + negExtent;
+        const perc1 = Math.round((Math.min(negExtent + d.val, negExtent) / tot) * 100);
+        const perc2 = Math.round((Math.abs(d.val) / tot) * 100);
         // The 0.01 to 0.001 is a workaround for what appears to be a
         // CSS rendering bug on flat, transparent colors
         return (
-          `linear-gradient(to left, rgba(0,0,0,0.2), rgba(0,0,0,0.2) ${perc}%, ` +
-          `rgba(0,0,0,0.01) ${perc}%, rgba(0,0,0,0.001) 100%)`
+          `linear-gradient(to right, rgba(0,0,0,0.01), rgba(0,0,0,0.001) ${perc1}%, ` +
+          `rgba(${r},0,0,0.2) ${perc1}%, rgba(${r},0,0,0.2) ${perc1 + perc2}%, ` +
+          `rgba(0,0,0,0.01) ${perc1 + perc2}%, rgba(0,0,0,0.001) 100%)`
         );
       }
       return null;