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客户要求将一个view改回原来的样子（即，不适用与新需求）。由于上次的修改采用了新增计算列的方法，所以，只需要将视图中的统计指标改回原来的列即可，修改起来挺方便的。
试想，如果未采用新增计算列的方法，而是通过Information Link修改了基本数据，那这次改动就没这么容易了。
可见，计算列功能还是具有很大的灵活性的。
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Calculated Column
A column that has been created from different expressions where calculations on other columns could be included. TIBCO Spotfire supports two different types of expressions: Insert Calculated Column, which creates a new column in the data table, and Custom Expression, which is used to dynamically modify the expression used on an axis or to define a setting. Both types of expressions are created with a similar user interface.