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Diffstat (limited to 'sql/item_row.h')
| -rw-r--r-- | sql/item_row.h | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/sql/item_row.h b/sql/item_row.h new file mode 100644 index 00000000..fbf632ba --- /dev/null +++ b/sql/item_row.h @@ -0,0 +1,156 @@ +#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 *get_copy(THD *thd) override + { return get_item_copy<Item_row>(thd, this); } + Item *build_clone(THD *thd) override; +}; + +#endif /* ITEM_ROW_INCLUDED */ |