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75 lines
2.8 KiB
75 lines
2.8 KiB
/* Copyright (c) 2006, 2018, 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, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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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, version 2.0, 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_base.h"
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#include "my_compiler.h"
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#include "my_inttypes.h"
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#include "sql/query_result.h" // Query_result_interceptor
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#include "sql/table.h"
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#include "sql/temp_table_param.h" // Temp_table_param
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class Item;
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class SELECT_LEX_UNIT;
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class THD;
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template <class T>
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class List;
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class Query_result_union : public Query_result_interceptor {
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Temp_table_param tmp_table_param;
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/// Count of rows successfully stored in tmp table
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ha_rows m_rows_in_table;
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public:
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TABLE *table;
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Query_result_union()
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: Query_result_interceptor(), m_rows_in_table(0), table(0) {}
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bool prepare(THD *thd, List<Item> &list, SELECT_LEX_UNIT *u) override;
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/**
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Do prepare() if preparation has been postponed until column type
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information is computed (used by Query_result_union_direct).
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@param thd Thread handle
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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(THD *thd MY_ATTRIBUTE((unused)),
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List<Item> &types MY_ATTRIBUTE((unused))) {
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return false;
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}
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bool send_data(THD *thd, List<Item> &items) override;
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bool send_eof(THD *thd) override;
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virtual bool flush();
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void cleanup(THD *) override { (void)reset(); }
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bool reset() override;
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bool create_result_table(THD *thd, List<Item> *column_types, bool is_distinct,
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ulonglong options, const char *alias,
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bool bit_fields_as_long, bool create_table);
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friend bool TABLE_LIST::create_materialized_table(THD *thd);
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virtual const ha_rows *row_count() const override { return &m_rows_in_table; }
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};
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#endif /* SQL_UNION_INCLUDED */
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