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public interface TableData {
 
    …
    /**
     * filter the input `TableData` based on columns.
     */
    public TableData filter(List<String> columnNames);

    /**
     * Pivot the input `TableData` for visualizations 
     */
    public TableData pivot(List<String> keyColumns,
                           List<String> groupColumns, 
                           List<String> valueColumns);
 

    …
}