planner: fix incorrectly using the schema for plan cache (#57964)#58091

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ti-chi-bot wants to merge 1 commit intopingcap:release-6.5from ti-chi-bot:cherry-pick-57964-to-release-6.5

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Commits on Dec 9, 2024

This is an automated cherry-pick of pingcap#57964

wjhuang2016
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