planner,executor: support show create database if not exists
syntax
#8926
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What problem does this PR solve?
pingcap/parser#147
pingcap/parser#148
MySQL compatibility:
show create database if not exists
syntaxSee: https://dev.mysql.com/doc/refman/5.7/en/show-create-database.html
MySQL
TiDB
What is changed and how it works?
Insert
/*!32312 IF NOT EXISTS*/
before shema name when statement containsif not exists
Check List
Tests
Code changes
Side effects
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This change is