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  • Committer: Andrew Hutchings
  • Date: 2011-02-07 17:20:59 UTC
  • mfrom: (2148 staging)
  • mto: (2148.2.3 build)
  • mto: This revision was merged to the branch mainline in revision 2149.
  • Revision ID: andrew@linuxjedi.co.uk-20110207172059-dyeahrgzrlincoe3
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drizzled/item.h
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 * statement "tree" or Lex.  Each item represents something in the
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 * execution plan.
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 */
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class DRIZZLED_API Item :
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  public memory::SqlAlloc
 
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class DRIZZLED_API Item : public memory::SqlAlloc
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{
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  /* Prevent use of these */
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  Item(const Item &);
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  bool with_sum_func;
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  bool is_autogenerated_name; /**< indicates whether name of this Item was autogenerated or set by user */
 
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  /**
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   * If this item is a subselect or some of its arguments is or contains a
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   * subselect. Computed by fix_fields.
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  bool with_subselect;
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  DTCollation collation;
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  Item_result cmp_context; /**< Comparison context */
 
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  /**
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   * Constructor
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   *
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   * optimisation changes in prepared statements
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   */
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  Item(Session *session, Item *item);
 
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  virtual ~Item()
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  {
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#ifdef EXTRA_DEBUG
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    collation.set(&my_charset_bin);
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    fix_char_length(max_char_length_arg);
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  }
 
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protected:
 
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  Session &getSession()
 
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  {
 
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    return _session;
 
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  }
 
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private:
 
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  Session &_session;
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};
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namespace display {