add test cases
	comments use english more understandable

	make cover passed
	make test-cli passed

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;

  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"

  update table1 set a = ( select a from table2 where b=1 and c=2) and b=1 where d=2
  update table1 set a = ( select a from table2 where b=1 and c=2), b=1, c=2 where d=2

  replace test-cli percent number with n% for CI

  COL.014 support NVARCHAR
  COL.013 support zero time

  col = 1 OR col IS NULL
  col1 = 1 OR col2 = 1

  sleep(), benchmark(), get_lock, release_lock() are
  dangerous function may not be used in online.

  WHERE col = col = '' and col1 = 'xx'

  RES.009 not consider about "and", "or"... Operator in
  BinaryOperationExpr

  RuleTimePrecision
  MySQL 5.6.4+ New time data type, support time precision to microsecond

  column.Tp may be nil when checking

  不建议使用连续判断
  SELECT * FROM tbl WHERE col = col = 'abc'

  support allow-collates checks

  COL.015 text/blob default value only tobe `NULL`;
  COL.012 text/blob `NOT NULL` CONSTRAINT may be danagerous;

  FULLTEXT INDEX suggestion

  insert values count large than -max-value-count will give ARG.012