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  1. MariaDB Server
  2. MDEV-35231

Wrong EXPLAIN or ANALYZE output: SUBQUERY instead of DEPENDENT SUBQUERY

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Details

    • Bug
    • Status: Open (View Workflow)
    • Major
    • Resolution: Unresolved
    • 11.2
    • 11.2
    • Optimizer
    • None

    Description

      This is coming from MDEV-25008.

      The testcase is here:
      https://jira.mariadb.org/browse/MDEV-25008?focusedCommentId=181152&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-181152 ("Alice's testcase")

      The complaint is here:

      https://jira.mariadb.org/browse/MDEV-25008?focusedCommentId=291378&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-291378

      What is displayed as SUBQUERY seems to be executed as dependent subquery.

      (check the minimum affected version. old versions like 10.5 do not seem to be affected. 11.2 is affected)

      Attachments

        Issue Links

          relates to

          Task - A task that needs to be done. MDEV-25008 Single-table UPDATE/DELETE: make cost-based choice between subquery strategies

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

          Activity

            People

              Unassigned Unassigned
              psergei Sergei Petrunia
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              Dates

                Created:
                Updated:

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