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327.2.4
by Brian Aker
Refactoring table.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 */ |