1 /* Copyright (c) 2006, 2021, Oracle and/or its affiliates. 2 3 This program is free software; you can redistribute it and/or modify 4 it under the terms of the GNU General Public License, version 2.0, 5 as published by the Free Software Foundation. 6 7 This program is also distributed with certain software (including 8 but not limited to OpenSSL) that is licensed under separate terms, 9 as designated in a particular file or component or in included license 10 documentation. The authors of MySQL hereby grant you an additional 11 permission to link the program and your derivative works with the 12 separately licensed software that they have included with MySQL. 13 14 This program is distributed in the hope that it will be useful, 15 but WITHOUT ANY WARRANTY; without even the implied warranty of 16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 GNU General Public License, version 2.0, for more details. 18 19 You should have received a copy of the GNU General Public License 20 along with this program; if not, write to the Free Software 21 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ 22 23 #ifndef SQL_UNION_INCLUDED 24 #define SQL_UNION_INCLUDED 25 26 #include "my_global.h" // ulong 27 #include "sql_class.h" // Query_result_interceptor 28 29 struct LEX; 30 31 typedef class st_select_lex_unit SELECT_LEX_UNIT; 32 33 class Query_result_union :public Query_result_interceptor 34 { 35 Temp_table_param tmp_table_param; 36 public: 37 TABLE *table; 38 bool is_union_mixed_with_union_all; // Mark the mixed operation 39 Query_result_union()40 Query_result_union() :table(0), 41 is_union_mixed_with_union_all(false){} 42 int prepare(List<Item> &list, SELECT_LEX_UNIT *u); 43 /** 44 Do prepare() and prepare2() if they have been postponed until 45 column type information is computed (used by Query_result_union_direct). 46 47 @param types Column types 48 49 @return false on success, true on failure 50 */ postponed_prepare(List<Item> & types)51 virtual bool postponed_prepare(List<Item> &types) 52 { return false; } 53 bool send_data(List<Item> &items); 54 bool send_eof(); 55 virtual bool flush(); 56 void cleanup(); 57 bool create_result_table(THD *thd, List<Item> *column_types, 58 bool is_distinct, ulonglong options, 59 const char *alias, bool bit_fields_as_long, 60 bool create_table); 61 friend bool TABLE_LIST::create_derived(THD *thd); 62 }; 63 64 #endif /* SQL_UNION_INCLUDED */ 65