Minor grafadruid fixes (#51)

Author: sbienkow-ninja

pkg/tsdb/druid/druid.go

@@ -451,11 +451,9 @@ func (ds *Service) prepareQuery(qry []byte, s *druidInstanceSettings) (druidquer
 
 func (ds *Service) prepareQueryContext(parameters []interface{}) map[string]interface{} {
 	ctx := make(map[string]interface{})
-	if parameters != nil {
-		for _, parameter := range parameters {
-			p := parameter.(map[string]interface{})
-			ctx[p["name"].(string)] = p["value"]
-		}
+	for _, parameter := range parameters {
+		p := parameter.(map[string]interface{})
+		ctx[p["name"].(string)] = p["value"]
 	}
 	return ctx
 }

pkg/tsdb/druid/result/common.go

@@ -1,6 +1,7 @@
 package result
 
 import (
+	"fmt"
 	"time"
 
 	"github.com/grafana/grafana-plugin-sdk-go/backend/log"
@@ -75,7 +76,7 @@ func toTypedResults(raw []interface{}) interface{} {
 		return results
 	default:
 		// TODO better error handling
-		log.DefaultLogger.Debug("Unsupported value %T", raw[0])
+		log.DefaultLogger.Debug(fmt.Sprintf("Unsupported type %T", raw[0]))
 		return nil
 	}
 }

pkg/tsdb/druid/result/timeseries.go

@@ -47,7 +47,7 @@ type TimeseriesRecord struct {
 }
 
 // Columns returns list of columns for given record.
-// The first column will always be "timestamp" followed by other columns sorter
+// The first column will always be "timestamp" followed by other columns sorted
 // alphabetically.
 func (t *TimeseriesRecord) Columns() []string {
 	columns := make([]string, len(t.Result)+1)