Implement `lists::concatenate_list_elements`#8231

Merged

rapids-bot[bot] merged 21 commits intorapidsai:branch-21.06from ttnghia:lists_concatenate_list_elements

May 20, 2021

+959-452

Commits on May 5, 2021

Rename concatenate_rows.hpp into combine.hpp and add concatenate_by_key
ttnghia
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Commits on May 7, 2021

Update doxygen
ttnghia
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WIP
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Commits on May 10, 2021

Commits on May 12, 2021

Commits on May 13, 2021

Update path to concatenate_rows in java and python sides
ttnghia
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Commits on May 14, 2021

Merge branch 'branch-0.20' into lists_concatenate_list_elements
ttnghia
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Commits on May 19, 2021

Change concatenate_rows.pxd to combine.pxd
ttnghia
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Commits on May 20, 2021