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

@param mergeWhenNotMatched
       Specifies how to process records that do not match preexisting data when merging. Valid values:
       <code>insert</code>, <code>none</code>.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-glue/src/main/java/com/amazonaws/services/glue/model/SnowflakeNodeData.java