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  1. MariaDB Server
  2. MDEV-12862

Data type of @a:=1e0 depends on the session character set

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Details

    • Bug
    • Status: Closed (View Workflow)
    • Major
    • Resolution: Fixed
    • 10.1(EOL), 10.2(EOL), 10.3(EOL)
    • 10.3.1
    • OTHER

    Description

      I start mysql --column-type-info test and run this script:

      SET NAMES latin1;
      		 
      CREATE OR REPLACE TABLE t1 AS SELECT @:=1e0;
      		 
      SELECT * FROM t1;

      It reports the following metadata:

      Field   1:  `@:=1e0`
      		 
      Type:       DOUBLE
      		 
      Collation:  binary (63)
      		 
      Length:     3
      		 
      Max_length: 1
      		 
      Decimals:   31

      Now I run the same script, with latin1 changed to utf8:

      SET NAMES utf8;
      		 
      CREATE OR REPLACE TABLE t1 AS SELECT @:=1e0;
      		 
      SELECT * FROM t1;

      Metadata changes to:

      Field   1:  `@:=1e0`
      		 
      Type:       DOUBLE
      		 
      Collation:  binary (63)
      		 
      Length:     9
      		 
      Max_length: 1
      		 
      Decimals:   31

      Notice, it reports length as 3 and 9 for latin1 and utf8 session character sets respectively.
      Looks wrong. It should not depent on the session character set.

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        Issue Links

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          Epic - Created by Jira Software - do not edit or delete. Issue type for a big user story that needs to be broken down. MDEV-4912 Data type plugin API version 1

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Closed

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              bar Alexander Barkov
              bar Alexander Barkov
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              Dates

                Created:
                Updated:
                Resolved:

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