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[NSE-1120] Support sum window function with order by statement #1122
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Rebased the patch. |
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Refactored the code to put sort logic in a base abstract class for rank/row_number/lag/sort_sum. In the future, if we need to add more window function requiring sort, we just need to implement finish function to handle sorted partition for each group. |
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@jackylee-ch, please have a review and verification. |
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This patch is based on #1056. So we need rebase it after #1056 is merged.