It is this binary representation that is used in the index entry when a number column is indexed.当数字列建立索引时，正是这个二进制表示用于索引项中。
This time, our 1 million row index entry has it's leading byte value spread across 99 (100 if you include a value for ze这次，我们一百万行的索引项将前导（/起始）字节分摊到99（若包括了0则有100个）个不同的值，而不是仅为4。