ddl: fix issue of alter last partition failed when partition column is datetime (#48815)#48847

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ti-chi-bot[bot] merged 3 commits intopingcap:release-7.1from ti-chi-bot:cherry-pick-48815-to-release-7.1

Nov 27, 2023

+179-8

Commits on Nov 23, 2023

This is an automated cherry-pick of pingcap#48815

crazycs520
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Commits on Nov 24, 2023

Revert "This is an automated cherry-pick of pingcap#48815 "
crazycs520
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ddl: fix issue of alter last partition failed when partition column is datetime (pingcap#48815 )
crazycs520
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