pass timerange in meta data queries

public/app/plugins/datasource/mysql/datasource.ts

@@ -9,7 +9,7 @@ export class MysqlDatasource {
   queryModel: MysqlQuery;
 
   /** @ngInject **/
-  constructor(instanceSettings, private backendSrv, private $q, private templateSrv) {
+  constructor(instanceSettings, private backendSrv, private $q, private templateSrv, private timeSrv) {
     this.name = instanceSettings.name;
     this.id = instanceSettings.id;
     this.responseParser = new ResponseParser(this.$q);
@@ -108,8 +108,11 @@ export class MysqlDatasource {
       format: 'table',
     };
 
+    const range = this.timeSrv.timeRange();
     const data = {
       queries: [interpolatedQuery],
+      from: range.from.valueOf().toString(),
+      to: range.to.valueOf().toString(),
     };
 
     if (optionalOptions && optionalOptions.range && optionalOptions.range.from) {

public/app/plugins/datasource/mysql/specs/datasource.test.ts

@@ -9,12 +9,23 @@ describe('MySQLDatasource', function() {
     replace: jest.fn(text => text),
   };
 
+  const raw = {
+    from: moment.utc('2018-04-25 10:00'),
+    to: moment.utc('2018-04-25 11:00'),
+  };
   const ctx = <any>{
     backendSrv,
+    timeSrvMock: {
+      timeRange: () => ({
+        from: raw.from,
+        to: raw.to,
+        raw: raw,
+      }),
+    },
   };
 
   beforeEach(() => {
-    ctx.ds = new MysqlDatasource(instanceSettings, backendSrv, {}, templateSrv);
+    ctx.ds = new MysqlDatasource(instanceSettings, backendSrv, {}, templateSrv, ctx.timeSrvMock);
   });
 
   describe('When performing annotationQuery', function() {