Pre-allocate map for performance

oldmantaiter · Sep 15, 2016 · ed41122 · ed41122
1 parent 1a9de4c
commit ed41122
Showing 1 changed file with 5 additions and 1 deletion.
diff --git a/tsdb/meta.go b/tsdb/meta.go
@@ -1088,7 +1088,11 @@ func (m *Measurement) walkWhereForSeriesIds(expr influxql.Expr) (SeriesIDs, Filt
 				return nil, nil, err
 			}
 
-			filters := FilterExprs{}
+			if len(ids) == 0 {
+				return ids, nil, nil
+			}
+
+			filters := make(FilterExprs, len(ids))
 			for _, id := range ids {
 				filters[id] = expr
 			}