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travis-ci

Experimental `add` support for DataFrame (#351)

* add some properties like is_unique to index

* add should_be_monotonic property to all index types in DataFrame

* add columns_values to dataframe and its chunk

* add max_val_close and min_val_close to index_value

* add split_monotonic_index_min_max

* add arithmetic to dataframe, not finish yet

* add tiling for arithmetic

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