public void setMergeClause(String mergeClause) {
        this.mergeClause = mergeClause;
    }
<p>
The SQL used in a custom merge to deal with matching records.
</p>

@param mergeClause
       The SQL used in a custom merge to deal with matching records.
aws-java-sdk-glue/src/main/java/com/amazonaws/services/glue/model/AmazonRedshiftNodeData.java