Allocation optimization

schema/tuples.go

@@ -82,6 +82,10 @@ func RecordToTuples(record []byte) ([]Tuple, []TypeError, error) {
 		return nil, nil, err
 	}
 
-	tuples, unprocessed := flatten(m, "", nil, nil)
+	// Allocation optimization: assume the incoming record is
+	// flat-ish and preallocate a Tuple slice.
+	tupleBuf := make([]Tuple, 0, len(m))
+
+	tuples, unprocessed := flatten(m, "", tupleBuf, nil)
 	return tuples, unprocessed, nil
 }