public String getMergeWhenMatched() {
        return this.mergeWhenMatched;
    }
<p>
Specifies how to resolve records that match preexisting data when merging. Valid values: <code> update</code>,
<code>delete</code>.
</p>

@return Specifies how to resolve records that match preexisting data when merging. Valid values:
        <code> update</code>, <code>delete</code>.
aws-java-sdk-glue/src/main/java/com/amazonaws/services/glue/model/SnowflakeNodeData.java