mssql: adds test for time should be ms in table mode

pkg/tsdb/mssql/mssql_test.go

@@ -654,6 +654,33 @@ func TestMSSQL(t *testing.T) {
 				So(err, ShouldBeNil)
 				So(len(queryResult.Tables[0].Rows), ShouldEqual, 3)
 			})
+
+			Convey("When doing an annotation query with a time column in datetime format", func() {
+				query := &tsdb.TsdbQuery{
+					Queries: []*tsdb.Query{
+						{
+							Model: simplejson.NewFromAny(map[string]interface{}{
+								"rawSql": "SELECT DATEADD(s, time_sec, {d '1970-01-01'}) AS time, description as [text], tags FROM [event] WHERE $__unixEpochFilter(time_sec) AND tags='ticket' ORDER BY 1 ASC",
+								"format": "table",
+							}),
+							RefId: "Tickets",
+						},
+					},
+					TimeRange: &tsdb.TimeRange{
+						From: fmt.Sprintf("%v", fromStart.Add(-20*time.Minute).Unix()*1000),
+						To:   fmt.Sprintf("%v", fromStart.Add(40*time.Minute).Unix()*1000),
+					},
+				}
+
+				resp, err := endpoint.Query(nil, nil, query)
+				queryResult := resp.Results["Tickets"]
+				So(err, ShouldBeNil)
+				So(len(queryResult.Tables[0].Rows), ShouldEqual, 3)
+				columns := queryResult.Tables[0].Rows[0]
+
+				//Should be in milliseconds
+				So(columns[0].(float64), ShouldBeGreaterThan, 1000000000000)
+			})
 		})
 	})
 }