ColumnMinimumExpression
An expression that takes values from two or more fields and returns the the smallest value of them
Example
<expression name="Minimum\_Column_1_2" class="org.jfree.report.function.ColumnMinimumExpression"> <properties> <property name="field\[0]">Column_1</property> <property name="field\[1]">Column_2</property> </properties> </expression>