statistics: move MergePartTopN2GlobalTopN into handle/globalstats (#47901)#47911

Merged

ti-chi-bot[bot] merged 2 commits intopingcap:release-7.5from ti-chi-bot:cherry-pick-47901-to-release-7.5

Oct 23, 2023

+203-177

Commits on Oct 23, 2023

This is an automated cherry-pick of pingcap#47901

hawkingrei
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ti-chi-bot
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hawkingrei
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