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  1. MariaDB ColumnStore
  2. MCOL-4577

VARCHAR(2) NOT NULL: explicit empty string gets converted to DEFAULT

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    Description

      DROP TABLE IF EXISTS t1;
      		 
      CREATE TABLE t1 (a VARCHAR(2) NOT NULL DEFAULT 'aa') ENGINE=ColumnStore;
      		 
      INSERT INTO t1 VALUES ('');
      		 
      SELECT HEX(a) FROM t1;


      +--------+
      		 
      | HEX(a) |
      		 
      +--------+
      		 
      | 6161   |
      		 
      +--------+

      Notice, emptry string was conversion to default 'aa'. Looks wrong.

      DROP TABLE IF EXISTS t1;
      		 
      CREATE TABLE t1 (a VARCHAR(2) NOT NULL DEFAULT ' ') ENGINE=ColumnStore;
      		 
      INSERT INTO t1 VALUES ('');
      		 
      SELECT HEX(a) FROM t1;


      +--------+
      		 
      | HEX(a) |
      		 
      +--------+
      		 
      | 20     |
      		 
      +--------+

      Notice, emptry string was conversion to default ' '. Looks wrong.

      DROP TABLE IF EXISTS t1;
      		 
      CREATE TABLE t1 (a VARCHAR(2) NOT NULL DEFAULT '  ') ENGINE=ColumnStore;
      		 
      INSERT INTO t1 VALUES ('  ');
      		 
      SELECT HEX(a) FROM t1;


      +--------+
      		 
      | HEX(a) |
      		 
      +--------+
      		 
      | 2020   |
      		 
      +--------+

      Notice, emptry string was conversion to default ' '. Looks wrong.

      In all above scenarios, INSERTs should:

      • either fail on NOT NULL violation for now
      • or insert an empty string (when we fix the flaw that emptry string is NULL)

      But it should not replace to DEFAULT!

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        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
          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.
          • Closed
          relates to

          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

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              sergey.zefirov Sergey Zefirov
              bar Alexander Barkov
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              Dates

                Created:
                Updated:
                Resolved:

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