feat: impl show collation and show charset statements #3753
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What's changed and what's your intention?
#3354
Please explain IN DETAIL what the changes are in this PR and why they are needed:
show collation
https://dev.mysql.com/doc/refman/8.0/en/show-collation.htmlshow charset
https://dev.mysql.com/doc/refman/8.0/en/show-character-set.htmlShowCreateTable
,CreateExternalTable
andAlter
statements, @shuiyisong please take a look.Checklist