text: select 0*char_length('중국이다') from db_root;
  select char_length(',I''M Chinese!') from db_root;
  select 0*char_length('중국이다,I''M Chinese!') from db_root;
  select char_length('123456789012'+true) from db_root;
  select char_length('123456789012'+123) from db_root;
  select char_length('123456789012'+'123') from db_root;
  select char_length('123456789012'+ trim(' 1 2 3 ')) from db_root;
  select char_length('123456789012'+ trim(' 1 ''2 3 ')) from db_root;
  select char_length('123456789012'+ trim(' 1 ''2\/ 3 ')) from db_root;
  select char_length('123456789012'+'123') + char_length('123456789012'+'123') from db_root;
  select char_length('123456789012'+'123') | char_length('123456789012'+'12356') from db_root;
  select char_length('123456789012'+'123') & char_length('123456789012'+'12356') from db_root;
  select char_length('123456789012'+'123') ^ char_length('123456789012'+'12356') from db_root;
  select char_length('123456789012'+'123') << char_length('123456789012'+'12356') from db_root;
  select char_length('123456789012'+'123') >> char_length('123456789012'+'12356') from db_root;
  select char_length('123456789012'+'123') DIV char_length('123456789012'+'12356') from db_root;
  select char_length('123456789012'+'123') MOD char_length('123456789012'+'12356') from db_root;
  select IF( char_length('123456789012'+'abc') >12,IFNULL(NULL,'TRUE'),'FALSE') from db_root;
  select IF( ~char_length('123456789012'+'abc') >12,IFNULL(NULL,'TRUE'),'FALSE') from db_root;
  select char_length(IF( char_length('123456789012'+'abc') >12,IFNULL(NULL,'TRUE'),'FALSE')) from db_root;
  select char_length(IF( ~char_length('123456789012'+'abc') >12,IFNULL(NULL,'TRUE'),'FALSE')) from db_root;
  select char_length('123456789012'+ trim(null)) from db_root;
  