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  1. MariaDB ColumnStore
  2. MCOL-4579

CHAR(2) NULL: empty strings or SPACE(N) get converted to NULL

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Details

    • Bug
    • Status: Closed (View Workflow)
    • Major
    • Resolution: Fixed
    • 5.5.1
    • 23.08
    • PrimProc
    • None

    Description

      DROP TABLE IF EXISTS t1;
      		 
      CREATE TABLE t1 (a CHAR(2) DEFAULT '') ENGINE=ColumnStore;
      		 
      INSERT INTO t1 VALUES ('');
      		 
      INSERT INTO t1 VALUES (' ');
      		 
      INSERT INTO t1 VALUES ('  ');
      		 
      SELECT HEX(a) FROM t1;


      +--------+
      		 
      | HEX(a) |
      		 
      +--------+
      		 
      | NULL   |
      		 
      | NULL   |
      		 
      | NULL   |
      		 
      +--------+


      DROP TABLE IF EXISTS t1;
      		 
      CREATE TABLE t1 (a CHAR(2) DEFAULT 'aa') ENGINE=ColumnStore;
      		 
      INSERT INTO t1 VALUES ('');
      		 
      INSERT INTO t1 VALUES (' ');
      		 
      INSERT INTO t1 VALUES ('  ');
      		 
      SELECT HEX(a) FROM t1;


      +--------+
      		 
      | HEX(a) |
      		 
      +--------+
      		 
      | NULL   |
      		 
      | NULL   |
      		 
      | NULL   |
      		 
      +--------+


      DROP TABLE IF EXISTS t1;
      		 
      CREATE TABLE t1 (a CHAR(2) DEFAULT ' ') ENGINE=ColumnStore;
      		 
      INSERT INTO t1 VALUES ('');
      		 
      INSERT INTO t1 VALUES (' ');
      		 
      INSERT INTO t1 VALUES ('  ');
      		 
      SELECT HEX(a) FROM t1;


      +--------+
      		 
      | HEX(a) |
      		 
      +--------+
      		 
      | NULL   |
      		 
      | NULL   |
      		 
      | NULL   |
      		 
      +--------+


      DROP TABLE IF EXISTS t1;
      		 
      CREATE TABLE t1 (a CHAR(2) DEFAULT '  ') ENGINE=ColumnStore;
      		 
      INSERT INTO t1 VALUES ('');
      		 
      INSERT INTO t1 VALUES (' ');
      		 
      INSERT INTO t1 VALUES ('  ');
      		 
      SELECT HEX(a) FROM t1;


      +--------+
      		 
      | HEX(a) |
      		 
      +--------+
      		 
      | NULL   |
      		 
      | NULL   |
      		 
      | NULL   |
      		 
      +--------+

      In all above cases, empty strings as well as strings consisting only of space characters were replaced to NULL. Looks wrong.

      Also, inserting an empty string should:

      • either store NULL for now (like it does)
      • or store the true empty string (when we fix the flaw that an empty string is NULL)

      Attachments

        Issue Links

          blocks

          Bug - A problem which impairs or prevents the functions of the product. MCOL-4403 Trailing spaces not behaving as InnoDB

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed
          duplicates

          New Feature - A new feature of the product, which has yet to be developed. MCOL-271 Improved support for NULL for Varchar/char/text/datetime/timestamp + ?

          • Blocker - Blocks development and/or testing work, production could not run.
          • Closed
          is caused by

          New Feature - A new feature of the product, which has yet to be developed. MCOL-3574 EMPTY column for persistant storage

          • Major - Major loss of function.
          • Open

          Activity

            People

              sergey.zefirov Sergey Zefirov
              bar Alexander Barkov
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              Dates

                Created:
                Updated:
                Resolved:

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