presto-kafka/src/main/java/io/prestosql/plugin/kafka/KafkaSplit.java/KafkaSplit/toString
class KafkaSplit:    @Override
    public String toString()
    {
        return toStringHelper(this)
                .add("topicName", topicName)
                .add("keyDataFormat", keyDataFormat)
                .add("messageDataFormat", messageDataFormat)
                .add("keyDataSchemaContents", keyDataSchemaContents)
                .add("messageDataSchemaContents", messageDataSchemaContents)
                .add("partitionId", partitionId)
                .add("start", start)
                .add("end", end)
                .add("leader", leader)
                .toString();
    }