presto-raptor-legacy/src/main/java/io/prestosql/plugin/raptor/legacy/systemtables/ValueBuffer.java/ValueBuffer/toString
class ValueBuffer:    @Override
    public String toString()
    {
        return toStringHelper(this)
                .add("columnIndex", columnIndex)
                .add("type", type)
                .add("value", value)
                .toString();
    }