statistics: fix "data too long" error when dumping stats from table with new collation data (#27033)#27301

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ti-chi-bot merged 4 commits intopingcap:release-5.1from ti-srebot:release-5.1-d06fd67764e6

Sep 16, 2021

+28-1

Commits on Aug 17, 2021

cherry pick pingcap#27033 to release-5.1

time-and-fate
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Commits on Sep 16, 2021