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  1. MariaDB ColumnStore
  2. MCOL-735

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

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    Details

    • Type: Bug
    • Status: Closed (View Workflow)
    • Priority: Minor
    • Resolution: Not a Bug
    • Affects Version/s: None
    • Fix Version/s: Icebox
    • Component/s: ExeMgr
    • Labels:
    • Environment:
      Amazon EC2 , MariaDB ColumnStore AMI

      Description

      (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) */

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            Assignee:
            LinuxJedi Andrew Hutchings (Inactive)
            Reporter:
            ykosila Yuichiro Kosila
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              Dates

              Created:
              Updated:
              Resolved:

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