public void setGroupName(String groupName) {
        this.groupName = groupName;
    }
<p>
A string that instructs Entity Resolution to combine several columns into a unified column with the identical
attribute type.
</p>
<p>
For example, when working with columns such as <code>first_name</code>, <code>middle_name</code>, and
<code>last_name</code>, assigning them a common <code>groupName</code> will prompt Entity Resolution to
concatenate them into a single value.
</p>

@param groupName
       A string that instructs Entity Resolution to combine several columns into a unified column with the
       identical attribute type. </p>
       <p>
       For example, when working with columns such as <code>first_name</code>, <code>middle_name</code>, and
       <code>last_name</code>, assigning them a common <code>groupName</code> will prompt Entity Resolution to
       concatenate them into a single value.
aws-java-sdk-entityresolution/src/main/java/com/amazonaws/services/entityresolution/model/SchemaInputAttribute.java