presto-main/src/main/java/io/prestosql/metadata/SqlAggregationFunction.java/SqlAggregationFunction/createFunctionByAnnotations
class SqlAggregationFunction:    public static List<SqlAggregationFunction> createFunctionByAnnotations(Class<?> aggregationDefinition)
    {
        return ImmutableList.of(AggregationFromAnnotationsParser.parseFunctionDefinition(aggregationDefinition));
    }