我们在这个结果的前面加上一个记录头字节“0x14”指明“完成”和长度字节“00 00 0c”指明我们将发送12字节的“verify data”。

We take the result and add a record header byte "0x14" to indicate "finished" and length bytes "00 00 0c" to indicate that we're sending 12 bytes of verify data.

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每个索引记录包含一个五字节的头，在它之前还有一个变长的头。

Each index record contains a five-byte header that may be preceded by a variable-length header.

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对于每个非空的变长字段，记录头使用一或两个字节包含了列的长度。

For each non-NULL variable-length field, the record header contains the length of the column in one or two bytes.

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