feat(influxdb): adds spread functionallity

closes #5211

CHANGELOG.md

@@ -7,6 +7,7 @@
 * **Graph**: Adds sort order options for graph tooltip, closes  [#1189](https://github.com/grafana/grafana/issues/1189)
 * **Theme**: Add default theme to config file [#5011](https://github.com/grafana/grafana/pull/5011)
 * **Page Footer**: Added page footer with links to docs, shows Grafana version and info if new version is available, closes [#4889](https://github.com/grafana/grafana/pull/4889)
+* **InfluxDB**: Add spread function, closes [#5211](https://github.com/grafana/grafana/issues/5211)
 
 # 3.0.4 Patch release (2016-05-25)
 * **Panel**: Fixed blank dashboard issue when switching to other dashboard while in fullscreen edit mode, fixes [#5163](https://github.com/grafana/grafana/pull/5163)

public/app/plugins/datasource/influxdb/query_part.ts

@@ -230,6 +230,15 @@ QueryPartDef.register({
   renderer: functionRenderer,
 });
 
+QueryPartDef.register({
+  type: 'spread',
+  addStrategy: addTransformationStrategy,
+  category: categories.Transformations,
+  params: [],
+  defaultParams: [],
+  renderer: functionRenderer,
+});
+
 QueryPartDef.register({
   type: 'non_negative_derivative',
   addStrategy: addTransformationStrategy,

public/app/plugins/datasource/influxdb/specs/query_part_specs.ts

@@ -16,6 +16,15 @@ describe('InfluxQueryPart', () => {
       expect(part.render('mean(value)')).to.be('derivative(mean(value), 10s)');
     });
 
+    it('should nest spread function', () => {
+      var part = queryPart.create({
+        type: 'spread'
+      });
+
+      expect(part.text).to.be('spread()');
+      expect(part.render('value')).to.be('spread(value)');
+    });
+
     it('should handle suffirx parts', () => {
       var part = queryPart.create({
         type: 'math',