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  • KEY

    typedef struct st_key {
      uint    key_length;            /* Tot length of key */
      ulong flags;                          /* dupp key and pack flags */
      uint    key_parts;            /* How many key_parts */
      uint  extra_length;
      uint    usable_key_parts;        /* Should normally be = key_parts */
      uint  block_size;
      enum  ha_key_alg algorithm;
      /*
        Note that parser is used when the table is opened for use, and
        parser_name is used when the table is being created.
      */
      union
      {
        plugin_ref parser;                  /* Fulltext [pre]parser */
        LEX_STRING *parser_name;            /* Fulltext [pre]parser name */
      };
      KEY_PART_INFO *key_part;
      char    *name;                /* Name of key */
      /*
        Array of AVG(#records with the same field value) for 1st ... Nth key part.
        0 means 'not known'.
        For temporary heap tables this member is NULL.
      */
      ulong *rec_per_key;
      union {
        int  bdb_return_if_eq;
      } handler;
      TABLE *table;
      LEX_STRING comment;
    } KEY;
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  • 原文地址:https://www.cnblogs.com/taek/p/5217055.html
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