presto-spi/src/main/java/io/prestosql/spi/block/VariableWidthBlockBuilder.java/VariableWidthBlockBuilder/writeLong
class VariableWidthBlockBuilder:    @Override
    public BlockBuilder writeLong(long value)
    {
        if (!initialized) {
            initializeCapacity();
        }
        sliceOutput.writeLong(value);
        currentEntrySize += SIZE_OF_LONG;
        return this;
    }