The record header is followed by the data contents of the columns. Columns that are NULL are omitted.

记录头的后面是字段的内容，其中空字段被忽略。

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

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。

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

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。

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