presto-spi/src/main/java/io/prestosql/spi/block/BlockBuilderStatus.java/BlockBuilderStatus/toString
class BlockBuilderStatus:    @Override
    public String toString()
    {
        StringBuilder buffer = new StringBuilder("BlockBuilderStatus{");
        buffer.append(", currentSize=").append(currentSize);
        buffer.append('}');
        return buffer.toString();
    }