ddl: update parser to make TiDB treat charset and collate case insensitive (#8577)#8611

Merged

winkyao merged 5 commits intopingcap:release-2.1from winkyao:cherry-pick-2,1

Dec 12, 2018

Commits on Dec 7, 2018

Commits on Dec 12, 2018

Merge branch 'release-2.1' into cherry-pick-2,1
winkyao
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