expression: fix that the result of expression castRealAsTime is inconsistent with mysql (#37461)#37560

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ti-srebot wants to merge 1 commit intopingcap:release-5.1from ti-srebot:release-5.1-0482b2e83ed2

+110-12

Commits on Sep 2, 2022

cherry pick pingcap#37461 to release-5.1

mengxin9014
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ti-srebot
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