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  1. MariaDB Server
  2. MDEV-4102

Limitation on DOUBLE or REAL length is ignored with INSERT .. SELECT

    Details

    • Type: Bug
    • Status: Closed (View Workflow)
    • Priority: Minor
    • Resolution: Fixed
    • Affects Version/s: 10.0.0, 5.5.28a, 5.3.11, 5.2.13, 5.1.66
    • Fix Version/s: 10.2.0
    • Component/s: OTHER
    • Labels:

      Description

      The problem is also reproducible on MySQL 5.1-5.6 and filed as http://bugs.mysql.com/bug.php?id=68192

      A DOUBLE (or REAL) column definition has a limitation on the total number of digits. It's honored when values are inserted explicitly, but not on INSERT .. SELECT:

      CREATE TABLE t1 (d1 DOUBLE(5,2), d2 DOUBLE(10,2)) ENGINE=InnoDB;
       
      INSERT INTO t1 VALUES (10000000.55, 10000000.55);
      Warnings:
      Warning	1264	Out of range value for column 'd1' at row 1
       
      # As expected, d1 is truncated:
       
      SELECT * FROM t1;
      d1	d2
      999.99	10000000.55
       
      INSERT INTO t1 SELECT d2, d2 FROM t1;
       
      # Now d1 is not truncated, and no warnings:
       
      SELECT * FROM t1;
      d1	d2
      999.99	10000000.55
      10000000.55	10000000.55

      Reproducible on 5.1-10.0.

      Test case:

      CREATE TABLE t1 (d1 DOUBLE(5,2), d2 DOUBLE(10,2)) ENGINE=InnoDB;
      INSERT INTO t1 VALUES (10000000.55, 10000000.55);
      INSERT INTO t1 SELECT d2, d2 FROM t1;
      SELECT * FROM t1;

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              • Assignee:
                bar Alexander Barkov
                Reporter:
                elenst Elena Stepanova
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                Dates

                • Created:
                  Updated:
                  Resolved: