The return clause constructs a new product element for each distinct ProductID value.

return子句为每个不同的productid值构造一个新的“product”元素。

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Otherwise, the else clause is evaluated, and DB2 returns an Info element containing only product ID and message data.

否则，执行else子句，DB2返回一个“info”元素，其中只包含产品ID和评语数据。

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If the number of tuples, calculated by using the Cartesian product, exceeds the set threshold; the NON EMPTY clause is applied to the query.

如果通过使用Cartesian产品计算的元组数超过设定的阈值，将NON empty子句应用于查询。

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