fix substring wrong result bug (#9603)#9619

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ti-chi-bot wants to merge 4 commits intopingcap:release-7.1from ti-chi-bot:cherry-pick-9603-to-release-7.1

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Commits on Nov 15, 2024

fix substring wrong result bug

guo-shaoge
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ti-chi-bot
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fix case

guo-shaoge
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ti-chi-bot
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Commits on Nov 18, 2024

fix case
guo-shaoge
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fix
guo-shaoge
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