planner: Set minimum cost to avoid parent multiplication cost discrepancies (#56387)#56411

Merged

ti-chi-bot[bot] merged 7 commits intopingcap:release-7.1from ti-chi-bot:cherry-pick-56387-to-release-7.1

Nov 12, 2024

+10-10

Commits on Sep 29, 2024

This is an automated cherry-pick of pingcap#56387

terry1purcell
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ti-chi-bot
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