110 lines
3.0 KiB
C++
110 lines
3.0 KiB
C++
/* Copyright (c) 2018, 2021, Alibaba 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/PolarDB-X Engine hereby grant you an
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additional permission to link the program and your derivative works with the
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separately licensed software that they have included with
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MySQL/PolarDB-X Engine.
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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_CCL_CCL_HINT_INCLUDED
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#define SQL_CCL_CCL_HINT_INCLUDED
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#include "lex_string.h"
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#include "my_inttypes.h"
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#include "sql_string.h"
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class THD;
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class Item;
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class SELECT_LEX;
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namespace im {
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/**
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All the ccl hint type.
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*/
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enum class Ccl_hint_type { CCL_HINT_QUEUE_FIELD, CCL_HINT_QUEUE_VALUE };
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/**
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The base class for the ccl queue hint.
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*/
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class Ccl_queue_hint {
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public:
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explicit Ccl_queue_hint(Item *item) : m_item(item) {}
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virtual ~Ccl_queue_hint() {}
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virtual std::string name() = 0;
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virtual ulonglong hash_value(THD *thd, const SELECT_LEX *select) = 0;
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virtual void print(const THD *thd, String *str);
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protected:
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Item *m_item;
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};
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/**
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Ccl queue field hint declaration.
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*/
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class Ccl_queue_field_hint : public Ccl_queue_hint {
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public:
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explicit Ccl_queue_field_hint(LEX_CSTRING lex_str, Item *item)
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: Ccl_queue_hint(item), m_field_name(lex_str) {}
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virtual ~Ccl_queue_field_hint() {}
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virtual std::string name();
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/**
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Hash value for the ccl_queue_field(field_name);
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@param[in] thd thread context
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@param[in] select the top-level select context
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*/
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virtual ulonglong hash_value(THD *thd, const SELECT_LEX *select);
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private:
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LEX_CSTRING m_field_name;
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};
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/**
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Ccl queue field hint declaration.
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*/
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class Ccl_queue_value_hint : public Ccl_queue_hint {
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public:
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explicit Ccl_queue_value_hint(LEX_CSTRING lex_str, Item *item)
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: Ccl_queue_hint(item), m_value_str(lex_str) {}
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virtual ~Ccl_queue_value_hint() {}
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virtual std::string name();
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/**
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Hash value for the ccl_queue_value(value);
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@param[in] thd thread context
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@param[in] select the top-level select context
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*/
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virtual ulonglong hash_value(THD *thd, const SELECT_LEX *select);
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private:
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LEX_CSTRING m_value_str;
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};
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ulonglong get_item_hash_value(Item *m_item);
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} /* namespace im */
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#endif
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