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  1. MariaDB Server
  2. MDEV-35185

Query cache used for results of vector search conflicts with the purpose of mhnsw_min_limit

Details

    Description

      Currently results of vector search queries are written into the query cache and read from it.
      It means that increasing mhnsw_min_limit at runtime for the purpose of a more precise search won't have any effect, as the previous less precise results will be still returned from the cache.

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          is caused by

          New Feature - A new feature of the product, which has yet to be developed. MDEV-34939 vector search in 11.7

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

          Activity

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            elenst Elena Stepanova created issue -
            elenst Elena Stepanova made changes -
            Field Original Value New Value
            serg Sergei Golubchik made changes -
            Priority Critical [ 2 ] Major [ 3 ]
            serg Sergei Golubchik made changes -
            Affects Version/s 11.7 [ 29815 ]
            Affects Version/s 11.8 [ 29921 ]
            Affects Version/s N/A [ 14700 ]
            serg Sergei Golubchik added a comment -

            I see two possible solutions here:

            • complex: extend Query_cache_query_flags somehow to allow plugins to add there their variables or flags. Not easy, as it'll break the assumption that Query_cache_query_flags is fixed size.
            • easy: disable query cache whenever VEC_DISTANCE is used
            serg Sergei Golubchik added a comment - I see two possible solutions here: complex: extend Query_cache_query_flags somehow to allow plugins to add there their variables or flags. Not easy, as it'll break the assumption that Query_cache_query_flags is fixed size. easy: disable query cache whenever VEC_DISTANCE is used
            serg Sergei Golubchik made changes -
            Fix Version/s 11.8 [ 29921 ]
            Fix Version/s 11.7(EOL) [ 29815 ]

            People

              serg Sergei Golubchik
              elenst Elena Stepanova
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              Dates

                Created:
                Updated:

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