planner: fix wrong result when pushing Agg down through Union in MPP plans (#46310)#46516

Merged

ti-chi-bot[bot] merged 8 commits intopingcap:release-6.5from ti-chi-bot:cherry-pick-46310-to-release-6.5

Oct 31, 2023

+126-36

Commits on Aug 30, 2023

This is an automated cherry-pick of pingcap#46310

AilinKid
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ti-chi-bot
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Commits on Oct 31, 2023

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AilinKid
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