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  1. MariaDB Server
  2. MDEV-36315

Inconsistent query result caused by index

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Details

    • Unexpected results
    • Duplicate of MDEV-36389
    • Q3/2025 Maintenance, Q4/2025 Server Maintenance

    Description

      I run the following cases, which are expected to return the same query result.

      -- case 1
      		 
      CREATE TABLE t1 (c1 TEXT) ENGINE=InnoDB;
      		 
      INSERT INTO t1 (c1) VALUES ('a');
      		 
      SELECT c1 FROM t1 WHERE CAST(c1 AS BINARY(7)) NOT IN (SELECT c1 FROM t1); -- {a}


      -- case 2
      		 
      CREATE TABLE t1 (c1 TEXT, UNIQUE (c1(1))) ENGINE=InnoDB;
      		 
      INSERT INTO t1 (c1) VALUES ('a');
      		 
      SELECT c1 FROM t1 WHERE CAST(c1 AS BINARY(7)) NOT IN (SELECT c1 FROM t1); -- actual: {}, expected: {a}

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          causes

          Bug - A problem which impairs or prevents the functions of the product. MDEV-37622 Wrong result when casting to BINARY(7)

          • Major - Major loss of function.
          • Closed
          relates to

          Bug - A problem which impairs or prevents the functions of the product. MDEV-34006 Incorrect query result

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

          Bug - A problem which impairs or prevents the functions of the product. MDEV-36389 Incorrect query results for an indexed text column

          • Critical - Crashes, loss of data, severe memory leak.
          • In Review

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              Gosselin Dave Gosselin
              John Jove John Jove
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