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Implements DataFrame.set_index, DataFrame.iloc. (#638)

* Implements DataFrame.set_index, DataFrame.iloc.

Signed-off-by: Tao He <linzhu.ht@alibaba-inc.com>

* Fixes an import.

Signed-off-by: HE, Tao <sighingnow@gmail.com>

* Tests for DataFrame.iloc.__setitem__ and DataFrame.set_index.

Signed-off-by: Tao He <linzhu.ht@alibaba-inc.com>

* Test fetch dataframe with slice (.iloc).

Signed-off-by: Tao He <linzhu.ht@alibaba-inc.com>

* Fix the operator registeration and add a FIXME for view of iloc.

Signed-off-by: Tao He <linzhu.ht@alibaba-inc.com>

* Delete the unused code.

Signed-off-by: Tao He <linzhu.ht@alibaba-inc.com>

* Address the dtype issue of series results.

Signed-off-by: Tao He <linzhu.ht@alibaba-inc.com>

* Fix `merge_chunks` for dataframe.

Signed-off-by: Tao He <linzhu.ht@alibaba-inc.com>

* Revise.

* Revise the shape calculation.

Signed-off-by: Tao He <linzhu.ht@alibaba-inc.com>

* Simplify the indexing on tensors.

Signed-off-by: Tao He <linzhu.ht@alibaba-inc.com>

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