parser: fix limit lost in SetOprStmt (#49898)#49931

Merged

ti-chi-bot[bot] merged 1 commit intopingcap:release-7.1from ti-chi-bot:cherry-pick-49898-to-release-7.1

Jan 4, 2024

+106-61

Commits on Dec 29, 2023

This is an automated cherry-pick of pingcap#49898
Defined2014
committed