Support for Window functions without partitions and with unbounded windows#1498

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wmalpica wants to merge 26 commits intoBlazingDB:branch-21.06from

wmalpica:feature/window_overlap3

Commits on Apr 9, 2021

Merge remote-tracking branch 'upstream/branch-0.19' into feature/window_overlap3
William Malpica
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Merge branch 'feature/df_window_overlap2' into feature/window_overlap3
William Malpica
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Commits on Apr 12, 2021

WIP, barely starting to figure stuff out
William Malpica
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Merge branch 'feature/window_overlap2' into feature/window_overlap3
William Malpica
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Commits on Apr 13, 2021

WIP on getting partial aggregations. Also refactored a bit
William Malpica
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some refactoring
William Malpica
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Commits on Apr 14, 2021

fixed get_bounds_from_window_expression and added more unit tests
William Malpica
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fixed issues with different types of windows. Added more e2e tests
William Malpica
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updated CHANGELOG
William Malpica
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Commits on Apr 15, 2021

Merge branch 'feature/unbounded_partitioned_windows' into feature/window_overlap3
William Malpica
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did some refactoring. Also more window WIP
William Malpica
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did some more refactoring and implementation
William Malpica
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WIP
William Malpica
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Commits on Apr 16, 2021

Merge branch 'branch-0.20' into feature/unbounded_partitioned_windows
William Malpica
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various refactors
William Malpica
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Commits on Apr 19, 2021

Merge branch 'branch-0.20' into feature/window_overlap3
William Malpica
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Merge branch 'branch-0.20' into feature/unbounded_partitioned_windows
William Malpica
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Merge branch 'feature/unbounded_partitioned_windows' into feature/window_overlap3
William Malpica
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fixed build bugs added a little more
William Malpica
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Commits on Apr 20, 2021

working on WindowAggMergerKernel
William Malpica
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Commits on Apr 21, 2021

fixed some build bugs
William Malpica
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Commits on Apr 23, 2021

WIP
William Malpica
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more WIP
William Malpica
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Commits on Apr 27, 2021

refactored test
William Malpica
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Commits on Apr 28, 2021

fixed a bug and added a new test
William Malpica
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WIP
William Malpica
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