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  1. MariaDB Server
  2. MDEV-39673

group_concat ignores max_allowed_packet

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Details

    • Can result in hang or crash

    Description

      connect u,localhost,root;
      		 
      set group_concat_max_len=2*@@max_allowed_packet;
      		 
      select length(group_concat(repeat('a', @@max_allowed_packet-1), repeat('a', @@max_allowed_packet-1))) from dual;
      		 
      disconnect u;
      		 
      connection default;

      Reported by Hcamael (www.aipyaipy.com)

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          relates to

          Bug - A problem which impairs or prevents the functions of the product. MDEV-41128 ST_COLLECT bypasses max_allowed_packet and returns an oversized aggregate without warning

          • Major - Major loss of function.
          • Confirmed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-41129 Query Cache replays an oversized GROUP_CONCAT result after max_allowed_packet is reduced

          • Major - Major loss of function.
          • Confirmed

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              serg Sergei Golubchik
              serg Sergei Golubchik
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