134 lines
4.0 KiB
C++
134 lines
4.0 KiB
C++
#ifndef ITEM_ROW_INCLUDED
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#define ITEM_ROW_INCLUDED
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/* Copyright (c) 2002, 2015, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA */
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#include "item.h" // Item
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/**
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Item which stores (x,y,...) and ROW(x,y,...).
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Note that this can be recursive: ((x,y),(z,t)) is a ROW of ROWs.
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*/
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class Item_row: public Item
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{
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typedef Item super;
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Item **items;
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table_map used_tables_cache, not_null_tables_cache;
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uint arg_count;
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bool const_item_cache;
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/**
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If elements are made only of constants, of which one or more are
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NULL. For example, this item is (1,2,NULL), or ( (1,NULL), (2,3) ).
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*/
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bool with_null;
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public:
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/**
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Row items used for comparing rows and IN operations on rows:
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@param pos current parse context
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@param head first column in the row
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@param tail rest of columns in the row
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@verbatim
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(a, b, c) > (10, 10, 30)
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(a, b, c) = (select c, d, e, from t1 where x=12)
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(a, b, c) IN ((1,2,2), (3,4,5), (6,7,8)
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(a, b, c) IN (select c, d, e, from t1)
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@endverbatim
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@todo
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think placing 2-3 component items in item (as it done for function
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*/
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Item_row(const POS &pos, Item *head, List<Item> &tail);
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Item_row(Item *head, List<Item> &tail);
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Item_row(Item_row *item):
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Item(),
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items(item->items),
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used_tables_cache(item->used_tables_cache),
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not_null_tables_cache(0),
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arg_count(item->arg_count),
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const_item_cache(item->const_item_cache),
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with_null(0)
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{}
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virtual bool itemize(Parse_context *pc, Item **res);
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enum Type type() const { return ROW_ITEM; };
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void illegal_method_call(const char *);
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bool is_null() { return null_value; }
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void make_field(Send_field *)
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{
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illegal_method_call((const char*)"make_field");
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};
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double val_real()
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{
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illegal_method_call((const char*)"val");
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return 0;
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};
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longlong val_int()
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{
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illegal_method_call((const char*)"val_int");
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return 0;
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};
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String *val_str(String *)
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{
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illegal_method_call((const char*)"val_str");
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return 0;
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};
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my_decimal *val_decimal(my_decimal *)
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{
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illegal_method_call((const char*)"val_decimal");
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return 0;
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};
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bool get_date(MYSQL_TIME *ltime, my_time_flags_t fuzzydate)
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{
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illegal_method_call((const char *) "get_date");
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return true;
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}
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bool get_time(MYSQL_TIME *ltime)
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{
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illegal_method_call((const char *) "get_time");
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return true;
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}
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bool fix_fields(THD *thd, Item **ref);
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void fix_after_pullout(st_select_lex *parent_select,
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st_select_lex *removed_select);
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void cleanup();
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void split_sum_func(THD *thd, Ref_ptr_array ref_pointer_array,
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List<Item> &fields);
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table_map used_tables() const { return used_tables_cache; };
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bool const_item() const { return const_item_cache; };
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enum Item_result result_type() const { return ROW_RESULT; }
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void update_used_tables();
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table_map not_null_tables() const { return not_null_tables_cache; }
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virtual void print(String *str, enum_query_type query_type);
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bool walk(Item_processor processor, enum_walk walk, uchar *arg);
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Item *transform(Item_transformer transformer, uchar *arg);
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uint cols() { return arg_count; }
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Item* element_index(uint i) { return items[i]; }
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Item** addr(uint i) { return items + i; }
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bool check_cols(uint c);
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bool null_inside() { return with_null; };
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void bring_value();
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bool check_gcol_func_processor(uchar *int_arg) {return false; }
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};
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#endif /* ITEM_ROW_INCLUDED */
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