public String getConstantType() {
        return this.constantType;
    }
<p>
The type of category filter constant. This element is used to specify whether a constant is a singular or
collective. Valid values are <code>SINGULAR</code> and <code>COLLECTIVE</code>.
</p>

@return The type of category filter constant. This element is used to specify whether a constant is a singular or
        collective. Valid values are <code>SINGULAR</code> and <code>COLLECTIVE</code>.
@see ConstantType
aws-java-sdk-quicksight/src/main/java/com/amazonaws/services/quicksight/model/TopicCategoryFilterConstant.java