planner: fix index-out-of-range error when checking only_full_group_by (#23844)#30645

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ti-srebot wants to merge 1 commit intopingcap:release-4.0from ti-srebot:release-4.0-bc06b96f2122

+20-1

Commits on Dec 12, 2021

cherry pick pingcap#23844 to release-4.0

xuyifangreeneyes
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