presto-benchmark/src/main/java/io/prestosql/benchmark/OdsBenchmarkResultWriter.java/OdsBenchmarkResultWriter/OdsBenchmarkResultWriter
class OdsBenchmarkResultWriter:    public OdsBenchmarkResultWriter(String entity, OutputStream outputStream)
    {
        requireNonNull(entity, "entity is null");
        requireNonNull(outputStream, "outputStream is null");
        this.entity = entity;
        try {
            jsonGenerator = new JsonFactory().createGenerator(outputStream, JsonEncoding.UTF8);
            jsonGenerator.writeStartArray();
        }
        catch (IOException e) {
            throw new UncheckedIOException(e);
        }
    }