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item_row.h
#ifndef ITEM_ROW_INCLUDED #define ITEM_ROW_INCLUDED /* Copyright (c) 2002, 2013, Oracle and/or its affiliates. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */ /** Row items used for comparing rows and IN operations on rows: @verbatim (a, b, c) > (10, 10, 30) (a, b, c) = (select c, d, e, from t1 where x=12) (a, b, c) IN ((1,2,2), (3,4,5), (6,7,8) (a, b, c) IN (select c, d, e, from t1) @endverbatim */ /** Item which stores (x,y,...) and ROW(x,y,...). Note that this can be recursive: ((x,y),(z,t)) is a ROW of ROWs. */ class Item_row: public Item_fixed_hybrid, private Item_args, private Used_tables_and_const_cache { table_map not_null_tables_cache; /** If elements are made only of constants, of which one or more are NULL. For example, this item is (1,2,NULL), or ( (1,NULL), (2,3) ). */ bool with_null; public: Item_row(THD *thd, List<Item> &list) :Item_fixed_hybrid(thd), Item_args(thd, list), not_null_tables_cache(0), with_null(0) { } Item_row(THD *thd, Item_row *row) :Item_fixed_hybrid(thd), Item_args(thd, static_cast<Item_args*>(row)), Used_tables_and_const_cache(), not_null_tables_cache(0), with_null(0) { } enum Type type() const override { return ROW_ITEM; }; const Type_handler *type_handler() const override { return &type_handler_row; } Field *create_tmp_field_ex(MEM_ROOT *root, TABLE *table, Tmp_field_src *src, const Tmp_field_param *param) override { return NULL; // Check with Vicentiu why it's called for Item_row } void illegal_method_call(const char *); bool is_null() override { return null_value; } void make_send_field(THD *thd, Send_field *) override { illegal_method_call((const char*)"make_send_field"); }; double val_real() override { illegal_method_call((const char*)"val"); return 0; }; longlong val_int() override { illegal_method_call((const char*)"val_int"); return 0; }; String *val_str(String *) override { illegal_method_call((const char*)"val_str"); return 0; }; my_decimal *val_decimal(my_decimal *) override { illegal_method_call((const char*)"val_decimal"); return 0; }; bool get_date(THD *thd, MYSQL_TIME *ltime, date_mode_t fuzzydate) override { illegal_method_call((const char*)"get_date"); return true; } bool fix_fields(THD *thd, Item **ref) override; void fix_after_pullout(st_select_lex *new_parent, Item **ref, bool merge) override; void cleanup() override; void split_sum_func(THD *thd, Ref_ptr_array ref_pointer_array, List<Item> &fields, uint flags) override; table_map used_tables() const override { return used_tables_cache; }; bool const_item() const override { return const_item_cache; }; void update_used_tables() override { used_tables_and_const_cache_init(); used_tables_and_const_cache_update_and_join(arg_count, args); } table_map not_null_tables() const override { return not_null_tables_cache; } void print(String *str, enum_query_type query_type) override; bool walk(Item_processor processor, bool walk_subquery, void *arg) override { if (walk_args(processor, walk_subquery, arg)) return true; return (this->*processor)(arg); } Item *transform(THD *thd, Item_transformer transformer, uchar *arg) override; bool eval_not_null_tables(void *opt_arg) override; bool find_not_null_fields(table_map allowed) override; uint cols() const override { return arg_count; } Item* element_index(uint i) override { return args[i]; } Item** addr(uint i) override { return args + i; } bool check_cols(uint c) override; bool null_inside() override { return with_null; }; void bring_value() override; Item* propagate_equal_fields(THD *thd, const Context &ctx, COND_EQUAL *cond) override { Item_args::propagate_equal_fields(thd, Context_identity(), cond); return this; } bool excl_dep_on_table(table_map tab_map) override { return Item_args::excl_dep_on_table(tab_map); } bool excl_dep_on_grouping_fields(st_select_lex *sel) override { return Item_args::excl_dep_on_grouping_fields(sel); } bool excl_dep_on_in_subq_left_part(Item_in_subselect *subq_pred) override { return Item_args::excl_dep_on_in_subq_left_part(subq_pred); } bool check_vcol_func_processor(void *arg) override {return FALSE; } Item *do_get_copy(THD *thd) const override { return get_item_copy<Item_row>(thd, this); } Item *do_build_clone(THD *thd) const override; }; #endif /* ITEM_ROW_INCLUDED */
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