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  1. MariaDB Server
  2. MDEV-20519

Query plan regression with optimizer_use_condition_selectivity > 1

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    Description

      The optimizer can choose very bad execution plans for certain queries with the default optimizer_use_condition_selectivity=4 in MariaDB 10.4. Setting optimizer_use_condition_selectivity=1 allows you to work around the problem.

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          causes

          Bug - A problem which impairs or prevents the functions of the product. MDEV-22535 TABLE::initialize_quick_structures() takes 0.5% in oltp_read_only

          • Major - Major loss of function.
          • Closed
          is blocked by

          Bug - A problem which impairs or prevents the functions of the product. MDEV-20576 A new assertion added to check validity of calculated selectivity values fails

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

          Bug - A problem which impairs or prevents the functions of the product. MDEV-20576 A new assertion added to check validity of calculated selectivity values fails

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-20595 Assertion `0 < sel && sel <= 2.0' failed in table_cond_selectivity

          • Major - Major loss of function.
          • Stalled

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              varun Varun Gupta (Inactive)
              GeoffMontee Geoff Montee (Inactive)
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              Dates

                Created:
                Updated:
                Resolved:

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