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Viewing changes to drizzled/item_subselect.h

  • Committer: Stewart Smith
  • Date: 2008-09-15 07:13:59 UTC
  • mfrom: (383.1.21 drizzle)
  • mto: This revision was merged to the branch mainline in revision 408.
  • Revision ID: stewart@flamingspork.com-20080915071359-f8bznznyaiqrtqxa
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drizzled/item_subselect.h
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class Item_subselect :public Item_result_field
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{
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  my_bool value_assigned; /* value already assigned to subselect */
 
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  bool value_assigned; /* value already assigned to subselect */
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public:
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  /* thread handler, will be assigned in fix_fields only */
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  THD *thd;
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  /* 
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    Location of the subquery predicate. It is either
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     - pointer to join nest if the subquery predicate is in the ON expression
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     - (TABLE_LIST*)1 if the predicate is in the WHERE.
 
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     - (TableList*)1 if the predicate is in the WHERE.
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  */
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  TABLE_LIST *expr_join_nest;
 
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  TableList *expr_join_nest;
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  /* The method chosen to execute the IN predicate.  */
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  enum enum_exec_method {
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  virtual void exclude()= 0;
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  virtual bool may_be_null() { return maybe_null; };
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  virtual table_map upper_select_const_tables()= 0;
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  static table_map calc_const_tables(TABLE_LIST *);
 
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  static table_map calc_const_tables(TableList *);
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  virtual void print(String *str, enum_query_type query_type)= 0;
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  virtual bool change_result(Item_subselect *si,
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                             select_result_interceptor *result)= 0;
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class subselect_single_select_engine: public subselect_engine
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{
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  my_bool prepared; /* simple subselect is prepared */
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  my_bool optimized; /* simple subselect is optimized */
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  my_bool executed; /* simple subselect is executed */
 
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  bool prepared; /* simple subselect is prepared */
 
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  bool optimized; /* simple subselect is optimized */
 
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  bool executed; /* simple subselect is executed */
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  st_select_lex *select_lex; /* corresponding select_lex */
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  JOIN * join; /* corresponding JOIN structure */
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public: