public void setProjectedColumns(java.util.Collection<String> projectedColumns) {
        if (projectedColumns == null) {
            this.projectedColumns = null;
            return;
        }

        this.projectedColumns = new java.util.ArrayList<String>(projectedColumns);
    }
<p>
Projected columns.
</p>

@param projectedColumns
       Projected columns.
aws-java-sdk-quicksight/src/main/java/com/amazonaws/services/quicksight/model/ProjectOperation.java