58 lines
2.0 KiB
C++
58 lines
2.0 KiB
C++
/* Copyright (c) 2006, 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
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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#ifndef SQL_UNION_INCLUDED
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#define SQL_UNION_INCLUDED
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#include "my_global.h" // ulong
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#include "sql_class.h" // Query_result_interceptor
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struct LEX;
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typedef class st_select_lex_unit SELECT_LEX_UNIT;
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class Query_result_union :public Query_result_interceptor
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{
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Temp_table_param tmp_table_param;
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public:
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TABLE *table;
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bool is_union_mixed_with_union_all; // Mark the mixed operation
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Query_result_union() :table(0),
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is_union_mixed_with_union_all(false){}
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int prepare(List<Item> &list, SELECT_LEX_UNIT *u);
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/**
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Do prepare() and prepare2() if they have been postponed until
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column type information is computed (used by Query_result_union_direct).
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@param types Column types
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@return false on success, true on failure
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*/
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virtual bool postponed_prepare(List<Item> &types)
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{ return false; }
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bool send_data(List<Item> &items);
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bool send_eof();
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virtual bool flush();
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void cleanup();
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bool create_result_table(THD *thd, List<Item> *column_types,
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bool is_distinct, ulonglong options,
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const char *alias, bool bit_fields_as_long,
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bool create_table);
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friend bool TABLE_LIST::create_derived(THD *thd);
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};
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#endif /* SQL_UNION_INCLUDED */
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