presto-record-decoder/src/main/java/io/prestosql/decoder/json/JsonRowDecoderFactory.java/JsonRowDecoderFactory/create
class JsonRowDecoderFactory:    @Override
    public RowDecoder create(Map<String, String> decoderParams, Set<DecoderColumnHandle> columns)
    {
        requireNonNull(columns, "columnHandles is null");
        return new JsonRowDecoder(objectMapper, chooseFieldDecoders(columns));
    }