parser: fix limit lost in SetOprStmt (#49898)#49935

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ti-chi-bot wants to merge 1 commit intopingcap:release-6.5from ti-chi-bot:cherry-pick-49898-to-release-6.5

+24,952-22

Commits on Dec 29, 2023

This is an automated cherry-pick of pingcap#49898

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