planner: fix wrong result when pushing Agg down through Union in MPP plans (#46310)#46519

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ti-chi-bot wants to merge 1 commit intopingcap:release-5.4from ti-chi-bot:cherry-pick-46310-to-release-5.4

Commits on Aug 30, 2023

This is an automated cherry-pick of pingcap#46310

AilinKid
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