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  1. MariaDB Server
  2. MDEV-40916

Do not materialise rejected MHNSW neighbours

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      Most distance-tested neighbours are rejected because they are no better than the furthest result or fall inside the threshold. These neighbours never enter a queue, so allocating a Visited object for them only consumes the query MEM_ROOT. Found while working on MDEV-38721

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            serg Sergei Golubchik
            ZtuyingChan Ziying Chen
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