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@ -1438,9 +1438,11 @@ bool Item_in_optimizer::eval_not_null_tables(uchar *opt_arg) |
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bool Item_in_optimizer::fix_left(THD *thd, Item **ref) |
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{ |
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DBUG_ENTER("Item_in_optimizer::fix_left"); |
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if ((!args[0]->fixed && args[0]->fix_fields(thd, args)) || |
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(!cache && !(cache= Item_cache::get_cache(args[0])))) |
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return 1; |
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DBUG_RETURN(1); |
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DBUG_PRINT("info", ("actual fix fields")); |
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cache->setup(args[0]); |
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if (cache->cols() == 1) |
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@ -1466,11 +1468,15 @@ bool Item_in_optimizer::fix_left(THD *thd, Item **ref) |
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{ |
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my_error(ER_NOT_SUPPORTED_YET, MYF(0), |
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"SUBQUERY in ROW in left expression of IN/ALL/ANY"); |
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return 1; |
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DBUG_RETURN(1); |
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} |
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Item *element=args[0]->element_index(i); |
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if (element->used_tables() || !element->const_item()) |
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((Item_cache *)cache->element_index(i))->set_used_tables(OUTER_REF_TABLE_BIT); |
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{ |
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((Item_cache *)cache->element_index(i))-> |
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set_used_tables(OUTER_REF_TABLE_BIT); |
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cache->set_used_tables(OUTER_REF_TABLE_BIT); |
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} |
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else |
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((Item_cache *)cache->element_index(i))->set_used_tables(0); |
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} |
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@ -1484,7 +1490,7 @@ bool Item_in_optimizer::fix_left(THD *thd, Item **ref) |
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cache->store(args[0]); |
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cache->cache_value(); |
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} |
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return 0; |
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DBUG_RETURN(0); |
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} |
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@ -5681,6 +5687,12 @@ void Item_equal::add_const(Item *c, Item *f) |
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func->quick_fix_field(); |
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cond_false= !func->val_int(); |
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} |
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/*
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TODO: also support the case where Item_equal becomes singular with |
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this->is_cond_true()=1. When I attempted to mark the item as constant, |
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the optimizer attempted to remove it, however it is still referenced from |
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COND_EQUAL and I got a crash. |
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*/ |
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if (cond_false) |
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const_item_cache= 1; |
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} |
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@ -5885,7 +5897,8 @@ void Item_equal::merge_into_list(List<Item_equal> *list, |
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void Item_equal::sort(Item_field_cmpfunc compare, void *arg) |
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{ |
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bubble_sort<Item>(&equal_items, compare, arg); |
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if (equal_items.elements > 1) |
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bubble_sort<Item>(&equal_items, compare, arg); |
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} |
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@ -5999,6 +6012,12 @@ bool Item_equal::fix_fields(THD *thd, Item **ref) |
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void Item_equal::update_used_tables() |
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{ |
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not_null_tables_cache= used_tables_cache= 0; |
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/*
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TODO: also support the case where Item_equal becomes singular with |
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this->is_cond_true()=1. When I attempted to mark the item as constant, |
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the optimizer attempted to remove it, however it is still referenced from |
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COND_EQUAL and I got a crash. |
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*/ |
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if ((const_item_cache= cond_false)) |
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return; |
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Item_equal_fields_iterator it(*this); |
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@ -6048,6 +6067,8 @@ longlong Item_equal::val_int() |
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{ |
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if (cond_false) |
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return 0; |
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if (is_cond_true()) |
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return 1; |
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Item *item= get_const(); |
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Item_equal_fields_iterator it(*this); |
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if (!item) |
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@ -6072,6 +6093,11 @@ longlong Item_equal::val_int() |
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void Item_equal::fix_length_and_dec() |
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{ |
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Item *item= get_first(NO_PARTICULAR_TAB, NULL); |
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if (!item) |
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{ |
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DBUG_ASSERT(is_cond_true()); // it should be the only constant
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item= equal_items.head(); |
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} |
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eval_item= cmp_item::get_comparator(item->cmp_type(), item, |
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item->collation.collation); |
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} |
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unknown
12 years ago