FETCH: Fetches columns from a table using a specific record identifier.

FETCH：使用指定的记录标识符从表中读取列。

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The lower three bytes, referred to as the record identifier (RID), contain the index of the row within the metadata table to which the token's MSB refers.

其他三个低位字节称为记录标识符 （RID），其中包含标记的MSB 所引用的元数据表中的行索引。

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The lower three bytes, referred to as the record identifier (RID), contain the index of the row within the metadata table to which the token's MSB refers.

其他三个低位字节称为记录标识符 （RID），其中包含标记的MSB 所引用的元数据表中的行索引。

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