Don't allocate a mergeSeries if there is only one series to merge.
@@ -340,6 +340,9 @@ func (c *mergeSeriesSet) Next() bool {
}
func (c *mergeSeriesSet) At() Series {
+ if len(c.currentSets) == 1 {
+ return c.currentSets[0].At()
+ }
series := []Series{}
for _, seriesSet := range c.currentSets {
series = append(series, seriesSet.At())
