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https://launchpad.net/bugs/586348
fix pthread atomics. operator precedence is important. The unit test now passes.

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drizzled/nested_join.h
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#define DRIZZLED_NESTED_JOIN_H
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#include <drizzled/sql_list.h>
 
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#include <drizzled/sql_bitmap.h>
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#include <drizzled/item.h>
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#include <drizzled/table_list.h>
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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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     True if this join nest node is completely covered by the query execution
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     plan. This means two things.
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     1. All tables on its @c join_list are covered by the plan.
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     2. All child join nest nodes are fully covered.
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   */
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  bool is_fully_covered() const { return join_list.elements == counter_; }
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};
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} /* namespace drizzled */