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  1. MariaDB Server
  2. MDEV-11399

AliSQL: [Feature] Issue#26 ADD SECONDARY CLUSTERING KEY SUPPORT

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      Description:
      		 
      ------------
      		 
      1. Add support for CLUSTERING key type that is a clustering
      		 
      secondary key
      		 
       
      		 
      2. Add secondary clustering key support to selected places
      		 
      in the query optimizer
      		 
       
      		 
      ported from percona-server:
      		 
      http://bazaar.launchpad.net/~laurynas-biveinis/percona-server/tokudb-multiple-clust-keys/revision/568
      		 
      http://bazaar.launchpad.net/~laurynas-biveinis/percona-server/tokudb-clustering-query-opt/revision/5695

      https://github.com/alibaba/AliSQL/commit/cf5e15eade48b67a82d413cb3b4289bbfefe25cf

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            plinux Lixun Peng
            svoj Sergey Vojtovich
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