Bugfix for lounchpad bug#608834 (608824, 609045, 609052).
Added get_tmp_table_item() to cache wrapper as it has all not simple Items (Item_func, Item_field, Item_subquery). mysql-test/r/subquery_cache.result: Tests for bugs fixed. mysql-test/t/subquery_cache.test: Tests for bugs fixed. sql/item.cc: Added get_tmp_table_item() to cache wrapper as it has all not simple Items (Item_func, Item_field, Item_subquery). sql/item.h: Added get_tmp_table_item() to cache wrapper as it has all not simple Items (Item_func, Item_field, Item_subquery).
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