This can be seen when you try to scan the left column of labels.

这一点在你需要扫视左列标签时可以表现出来。

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As shown in the IXSCAN descriptor in Figure 8, the leading column of the index exploited by optimizer is PRODUCT_NUMBER, which does not provide the order required for merge scan join.

如图8的IXSCAN描述符所示，通过优化器利用的索引的领先列是PRODUCT _ NUMBER，其不为合并扫描联接提供所需的顺序。

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The scan accumulates a word until a break (either the end of a row or column, or a non-letter tile) and then adds the word to all the letter cells it found along the way.

扫描会向一个单词进行累积， 直到结束（或者是行或列的末尾，或者遇到非字母的块），然后将此单词添加到它寻找过程中遍历的所有字母细胞。

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