如果只需要索引中包含的值，而不需要读取这些行。
If the values contained in the index are all that is required, the rows are not read.
然而，如果每个不同的索引值都有许多重复的行，而所关联的表是高度群集的，那么通过索引添加的连接成本可能很低。
However, if there are many duplicate rows per distinct index value, and the associated table is highly clustered, the added costs of joining through the index can be slight.
该方法接受5个参数：行索引、列索引、单元格值、电子表格键和工作表键。
This method accepts five arguments: the row index, the column index, the cell value, the spreadsheet key, and the worksheet key.
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