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

  SELECT c1, c2, c3, FROM tb WHERE id < 1000 AND content="mytest* as test"