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{
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  user_var_entry *var_entry;
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  Item_result m_cached_result_type;
 
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  Session &session;
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public:
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  LEX_STRING name; // keep it public
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  Item_func_get_user_var(LEX_STRING a):
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    Item_func(), m_cached_result_type(STRING_RESULT), name(a) {}
 
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  Item_func_get_user_var(Session &session_arg, LEX_STRING a):
 
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    Item_func(),
 
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    m_cached_result_type(STRING_RESULT),
 
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    session(session_arg),
 
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    name(a)
 
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  {}
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  enum Functype functype() const { return GUSERVAR_FUNC; }
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  LEX_STRING get_name() { return name; }
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  double val_real();