如果从数据库返回结果时间过长，该方法也会成为一个热点(在13行)。
The method will also become a hot spot (at line 13) if it takes the database a long time to return the results.
该算法基于行枚举，通过长事务的交集运算，直接得到长项集，不必从短项集逐步扩展得到长项集。
The algorithm is based on row enumeration, which can find high-utility long itemsets directly by intersecting long transactions, without extending short itemsets step by step.
如果数据库引擎遇到过长的行，则返回执行错误。
If the Database Engine encounters a row that is too long, an execution error is returned.
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