planner: do not remove the first row func if it is a constant | tidb-test=pr/2277 (#50020)#50284

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ti-chi-bot wants to merge 1 commit intopingcap:release-6.1from ti-chi-bot:cherry-pick-50020-to-release-6.1

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Commits on Jan 10, 2024

This is an automated cherry-pick of pingcap#50020

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