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    • EmirVildanov's avatar
      feat: refactor explain operator · 2c5c7fc6
      EmirVildanov authored
      2c5c7fc6
    • Arseniy Volynets's avatar
      fix: block vshard rebalancing during dql · 4a1bebf5
      Arseniy Volynets authored
      When reading from multiple storages it is
      possible that some requests will execute faster
      than the others. And it could lead to wrong
      results when vhard moved the buckets between
      nodes.
      
      For example: we execute `select * from t`
      on storage 1 and get the results. Vshard
      moves the data from storage 1 to stroage 2,
      and then we execute `select * from t` and in
      result we get the data (that moved) twice.
      
      This commit fixes it by using vshard's
      storage ref api. Now multi-node read requests
      first create the ref on each node which
      blocks vshard rebalancing. Then we call
      our stored procedure and remove the ref.
      4a1bebf5
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