Fix decode error when "NULL" value in the column with "primary key" flag (#5879)#5934

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ti-chi-bot wants to merge 1 commit intopingcap:release-4.0from ti-chi-bot:cherry-pick-5879-to-release-4.0

+3,505-11

Commits on Sep 16, 2022

This is an automated cherry-pick of pingcap#5879

JaySon-Huang
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ti-chi-bot
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