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  • Committer: Brian Aker
  • Date: 2008-08-18 22:20:43 UTC
  • mto: This revision was merged to the branch mainline in revision 352.
  • Revision ID: brian@tangent.org-20080818222043-et6zf93ogrgx1cz9
Refactoring table.h

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drizzled/nested_join.h
 
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#ifndef DRIZZLED_NESTED_JOIN_H
 
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#define DRIZZLED_NESTED_JOIN_H
 
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struct nested_join_st
 
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{
 
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  List<TableList>  join_list;       /* list of elements in the nested join */
 
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  table_map         used_tables;     /* bitmap of tables in the nested join */
 
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  table_map         not_null_tables; /* tables that rejects nulls           */
 
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  struct st_join_table *first_nested;/* the first nested table in the plan  */
 
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  /* 
 
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    Used to count tables in the nested join in 2 isolated places:
 
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    1. In make_outerjoin_info(). 
 
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    2. check_interleaving_with_nj/restore_prev_nj_state (these are called
 
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       by the join optimizer. 
 
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    Before each use the counters are zeroed by reset_nj_counters.
 
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  */
 
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  uint              counter_;
 
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  nested_join_map   nj_map;          /* Bit used to identify this nested join*/
 
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  /*
 
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    (Valid only for semi-join nests) Bitmap of tables outside the semi-join
 
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    that are used within the semi-join's ON condition.
 
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  */
 
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  table_map         sj_depends_on;
 
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  /* Outer non-trivially correlated tables */
 
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  table_map         sj_corr_tables;
 
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  List<Item>        sj_outer_expr_list;
 
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};
 
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#endif /* DRIZZLED_NESTED_JOIN_H */