public ExecuteQueryResult withColumns(ColumnInfo... columns) {
        if (this.columns == null) {
            setColumns(new java.util.ArrayList<ColumnInfo>(columns.length));
        }
        for (ColumnInfo ele : columns) {
            this.columns.add(ele);
        }
        return this;
    }
<p>
Represents a single column in the query results.
</p>
<p>
<b>NOTE:</b> This method appends the values to the existing list (if any). Use
{@link #setColumns(java.util.Collection)} or {@link #withColumns(java.util.Collection)} if you want to override
the existing values.
</p>

@param columns
       Represents a single column in the query results.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-iotsitewise/src/main/java/com/amazonaws/services/iotsitewise/model/ExecuteQueryResult.java