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  1. MariaDB Server
  2. MDEV-34807

Testing of optimizer hints

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    • Task
    • Status: Open (View Workflow)
    • Major
    • Resolution: Unresolved
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    Description

      Our implementation of optimizer hints is intended to bring compatibility with the corresponding functionality of MySQL, which is described here.

      Currently we have implemented a partial subset of the hints:

      • hints for join buffering: BNL(), NO_BNL(), BKA(), NO_BKA();
      • NO_ICP() hint for disabling index condition pushdown;
      • MRR(), MO_MRR() hint for multi-range reads control;
      • NO_RANGE_OPTIMIZATION() for disabling range optimization;
      • QB_NAME() for assigning names for query blocks.

      Examples of applying hints to SQL statements can be found at

      mysql-test/main/opt_hints.test

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              oleg.smirnov Oleg Smirnov
              oleg.smirnov Oleg Smirnov
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