String Manipulation Functions Either Returns Incorrect Resultsets or Cause Internal Error When Applied To Japanese Data

(1) USASCII data seems not affected
(2) Phenonemon seem when Japanese data are included
(3) I have not tested on non-Japanese UTF-8 data yet
(4) I confirmed that works correctly and no problem seen when InnoDB is selected
(5) I have not tested all string manipulation functions yet , for I cannot find the list of available functions supported in ColumnStore mode in the website
(6) Currently, avoid using functions, or not storing non-ASCII data when ColumnStore engine is selected

/* Test Code (Begin) */
CREATE DATABASE IF NOT EXISTS `mytest` DEFAULT CHARSET=utf8 DEFAULT COLLATE=utf8_general_ci ;
USE `mytest` ; COMMIT ;
CREATE TABLE `mytable` ( `col1` CHAR(99) , `col2` VARCHAR(99) ) Engine=ColumnStore DEFAULT CHARSET=utf8 ;
COMMIT ;
INSERT INTO `mytable` ( `col1` , `col2` ) VALUES ( 'Aaa' , 'Bbb' ) ;
INSERT INTO `mytable` ( `col1` , `col2` ) VALUES ( 'Ccc' , 'Ddd' ) ;
INSERT INTO `mytable` ( `col1` , `col2` ) VALUES ( ' A quick brown FOX ! ' , ' Jumped over the lazy DOG ? ' ) ;
INSERT INTO `mytable` ( `col1` , `col2` ) VALUES ( 'テスト' , 'ﾃｽﾄ' ) ;
INSERT INTO `mytable` ( `col1` , `col2` ) VALUES ( 'マリアの実験' , 'ＭａｒｉａＤＢ＿Ｔｅｓｔ' ) ;
INSERT INTO `mytable` ( `col1` , `col2` ) VALUES ( ' 半角空白囲み ' , '　全角空白囲み　' ) ;
COMMIT ;
SELECT `col1` , `col2` FROM `mytable` ; /* Trailing half-width whitespaces got lost ? */
SELECT `col1` , TRIM(`col1`) , `col2` , TRIM(`col2`) FROM `mytable` ; /* Internal Error */
SELECT `col1` , UPPER(`col1`) , `col2` , LOWER(`col2`) FROM `mytable` ; /* No error but incorrect result however the functions may not support full-width case conversion */
SELECT `col1` , LENGTH(`col1`) , `col2` , LENGTH(`col2`) FROM `mytable` ; /* Not char count, rather consumed bytes ? */
SELECT `col1` , REVERSE(`col1`) , `col2` , REVERSE(`col2`) FROM `mytable` ; /* Trailing blank lost in the result */
SELECT `col1` , SUBSTRING(`col1` , 2 , 2 ) , `col2` , SUBSTRING(`col2` , 2 , 2 ) FROM `mytable` ; /* No error but incorrect result */
COMMIT ;
DROP DATABASE IF EXISTS `mytest` ; COMMIT ;
USE `mysql` ; COMMIT ;
/* Test Code (End) */