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  1. MariaDB Server
  2. MDEV-34626

Changing the Block Nested Loop mode to make ANTI JOIN missing data

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Details

    • Bug
    • Status: Closed (View Workflow)
    • Major
    • Resolution: Cannot Reproduce
    • 11.6.0
    • N/A
    • Storage Engine - InnoDB
    • None
    • Ubuntu 20.04.4 LTS (x86)
      Kernel Version: 5.15.0-113-generic

    Description

      How to repeat:

      CREATE TABLE t0(c0 CHAR(100)  NOT NULL, PRIMARY KEY(c0));
      		 
      CREATE TABLE t1(c0 VARCHAR(100) );
      		 
      INSERT INTO t1 VALUES ('B');
      		 
      INSERT INTO t0 VALUES ('bྃ');
      		 
      INSERT INTO t1 VALUES ('gIG');
      		 
      SET SESSION join_cache_level = 7;
      		 
       
      		 
      SELECT * FROM t0; -- get [bྃ]
      		 
      SELECT * FROM t1; -- get [B,gIG]
      		 
       
      		 
      SELECT t1.c0 FROM t1  WHERE NOT EXISTS (SELECT 1 FROM t0 WHERE t1.c0 = t0.c0);  -- get [gIG], expect [B,gIG]

      Suggested fix:
      When join_cache_level is switched back to the default value of 2, the results are correct.

      Attachments

        Issue Links

          duplicates

          Bug - A problem which impairs or prevents the functions of the product. MDEV-34627 Changing the Block Nested Loop mode to make ANTI JOIN missing data

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-34628 Changing the Block Nested Loop mode to make ANTI JOIN missing data

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-34629 Changing the Block Nested Loop mode to make ANTI JOIN missing data

          • Major - Major loss of function.
          • Closed

          Activity

            People

              Unassigned Unassigned
              Chenglin Liang Chenglin Liang
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              Dates

                Created:
                Updated:
                Resolved:

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