ColumnDifferenceExpression
Description
An expression that takes values from two or more fields and returns the difference of them.
Example
<expression name="Difference\_Column" class="org.jfree.report.function.ColumnDifferenceExpression"> <properties> <property name="field\[0]">Column_1</property> <property name="field\[1]">Column_2</property> </properties> </expression>