presto-main/src/main/java/io/prestosql/operator/aggregation/DecimalAverageAggregation.java/DecimalAverageAggregation/createInputParameterMetadata
class DecimalAverageAggregation:    private static List<ParameterMetadata> createInputParameterMetadata(Type type)
    {
        return ImmutableList.of(new ParameterMetadata(STATE), new ParameterMetadata(BLOCK_INPUT_CHANNEL, type), new ParameterMetadata(BLOCK_INDEX));
    }