add test cases
	comments use english more understandable

	column-not-allow-type show be L9 as it's name said

	make cover passed
	make test-cli passed

	check suggest.Content != ""

	string -> int can use index

Go 1.16

The go command now builds packages in module-aware mode by default, even
when no go.mod is present. This is a big step toward using modules in
all projects.

Co-authored-by: Nqifanwang <qifanwang@tencent.com>

Co-authored-by: Nqifanwang <qifanwang@tencent.com>

Co-authored-by: Nqifanwang <qifanwang@tencent.com>

COL.014 modify the judgment about the character set;COL.012/COL.015 a…

COL.014 modify the judgment about the character set;COL.012/COL.015 add the judgment about the json type;ALT.001 modify the judgment about the ;fix func ShowCreateTable's error when table is partition;

修复引号中的注释判断

  Test Function:
  var i = 1
  // infinite loop
  for {
	for _, sql := range TestSQLs {
		go ast.QueryType(sql)
	}
	i = i + 1
	fmt.Println("loop: ", i)
  }

  remove fmt.Println debug output
  LIT.003 remove varchar, text check for primary key

  WHEN InvisibleUnicode IN SQL give suggestion
  update test cases golden file