refine agg/topn and add more unit tests#6549

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ti-chi-bot merged 9 commits intopingcap:masterfrom SeaRise:refine_topn

Dec 28, 2022

+337-218

Commits on Dec 26, 2022

test for two level merge
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move
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update
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update
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update
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address comment
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Commits on Dec 28, 2022