HASH_LOOKUP, a function that determines the destination column value from a lookup table according to a value derived from a source column.
HASH_LOOKUP，该函数根据源列派生的值来确定查找表的目标列值。
After that, we need edit TARGET_ITEMID parameter, setting the parameter's value so that it is derived from the top level WI_ITEMID column table.
在此之后，我们需要编辑TARGET _ ITEMID参数，设置参数的值，这样就可以从顶级层次wi_itemid列表格中获得该参数的值。
The table has a row change timestamp column: a row change TOKEN expression returns a BIGINT value derived from the timestamp value in the column.
表具有一个行修改时间戳列：ROWCHANGETOKEN表达式返回一个从列的时间戳值获得的bigint值。
The table has a row change timestamp column: a row change TOKEN expression returns a BIGINT value derived from the timestamp value in the column.
表具有一个行修改时间戳列：ROWCHANGETOKEN表达式返回一个从列的时间戳值获得的bigint值。
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