planner: fix wrong range calculation for Nulleq function on Enum values (#32440)#32491

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ti-srebot wants to merge 1 commit intopingcap:release-4.0from ti-srebot:release-4.0-1b04c3b054c2

+3,374

Commits on Feb 21, 2022

cherry pick pingcap#32440 to release-4.0

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