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  1. MariaDB Server
  2. MDEV-10063

VIEWs and subqueries with FOR UPDATE

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Details

    • Bug
    • Status: Open (View Workflow)
    • Major
    • Resolution: Unresolved
    • 5.5, 10.0, 10.1, 10.2, 10.3, 10.4, 10.5
    • 10.4, 10.5
    • Views

    Description

      This is similar to MDEV-10035, but now FOR UPDATE is used inside a subquery:

      I run this script:

      DROP TABLE IF EXISTS t1;
      CREATE TABLE t1 (a INT) ENGINE=InnoDB;
      INSERT INTO t1 VALUES (10);
      DROP VIEW IF EXISTS v1;
      CREATE VIEW v1 AS SELECT (SELECT a FROM t1 FOR UPDATE) FROM t1;
      START TRANSACTION;
      SELECT * FROM v1;
      

      Now I open a new session and run this script:

      START TRANSACTION;
      SELECT a FROM t1 FOR UPDATE;
      

      It immediately returns a result:

      +------+
      | a    |
      +------+
      |   10 |
      +------+
      

      This is wrong. Subselects with FOR UPDATE should be disallowed in VIEWs.

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              Unassigned Unassigned
              bar Alexander Barkov
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              Dates

                Created:
                Updated:

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