94 lines
3.7 KiB
C++
94 lines
3.7 KiB
C++
/* Copyright (c) 2006, 2024, Oracle and/or its affiliates.
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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 designed to work 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 either included with
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the program or referenced in the documentation.
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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 <sys/types.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 Query_expression;
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class THD;
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template <class Element_type>
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class mem_root_deque;
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class Query_result_union : public Query_result_interceptor {
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protected:
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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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Query_result_union() : Query_result_interceptor(), table(nullptr) {}
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bool prepare(THD *thd, const mem_root_deque<Item *> &list,
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Query_expression *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 [[maybe_unused]],
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const mem_root_deque<Item *> &types
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[[maybe_unused]]) {
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return false;
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}
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bool send_data(THD *thd, const mem_root_deque<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() override { (void)reset(); }
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bool reset() override;
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bool create_result_table(THD *thd, const mem_root_deque<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, Query_term_set_op *op = nullptr);
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friend bool Table_ref::create_materialized_table(THD *thd);
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friend bool Table_ref::optimize_derived(THD *thd);
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uint get_hidden_field_count() const {
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return tmp_table_param.hidden_field_count;
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}
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bool skip_create_table() const { return tmp_table_param.skip_create_table; }
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/// Set an effective LIMIT for the number of rows coming out of a materialized
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/// temporary table used for implementing INTERSECT or EXCEPT: informs
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/// TableScanIterator::TableScanIterator how many rows to read from the
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/// materialized table. For UNION and simple tables the limitation is enforced
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/// earlier, at materialize time, but this is not possible for INTERSECT and
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/// EXCEPT due to the use of cardinality counters.
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///
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/// @param limit_rows the effective limit, or HA_POS_ERROR if none.
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void set_limit(ha_rows limit_rows) override;
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// For assignment of tmp_table_param for CTE clones
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friend class Common_table_expr;
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};
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#endif /* SQL_UNION_INCLUDED */
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