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drizzled/optimizer/sel_arg.h
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class SEL_ARG :public memory::SqlAlloc
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{
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public:
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  uint8_t min_flag,max_flag,maybe_flag;
 
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  uint8_t min_flag;
 
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  uint8_t max_flag;
 
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  uint8_t maybe_flag;
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  uint8_t part;                                 // Which key part
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  uint8_t maybe_null;
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  /*
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  SEL_ARG *next,*prev;    /* Links for bi-directional interval list */
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  SEL_ARG *parent;        /* R-B tree parent */
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  SEL_ARG *next_key_part;
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  enum leaf_color { BLACK,RED } color;
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  enum Type { IMPOSSIBLE, MAYBE, MAYBE_KEY, KEY_RANGE } type;
 
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  enum leaf_color 
 
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  { 
 
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    BLACK,
 
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    RED 
 
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  } color;
 
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  enum Type 
 
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  { 
 
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    IMPOSSIBLE, 
 
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    MAYBE, 
 
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    MAYBE_KEY, 
 
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    KEY_RANGE 
 
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  } type;
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  enum 
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  {