public String getMergeWhenNotMatched() {
        return this.mergeWhenNotMatched;
    }
<p>
Specifies how to process records that do not match preexisting data when merging. Valid values:
<code>insert</code>, <code>none</code>.
</p>

@return Specifies how to process records that do not match preexisting data when merging. Valid values:
        <code>insert</code>, <code>none</code>.
aws-java-sdk-glue/src/main/java/com/amazonaws/services/glue/model/SnowflakeNodeData.java