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95 lines
2.9 KiB
95 lines
2.9 KiB
5 months ago
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/* Copyright (c) 2011, 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 OPT_EXPLAIN_FORMAT_TRADITIONAL_INCLUDED
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#define OPT_EXPLAIN_FORMAT_TRADITIONAL_INCLUDED
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#include <stddef.h>
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#include "sql/opt_explain_format.h"
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#include "sql/parse_tree_node_base.h"
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class Item;
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class Query_result;
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class SELECT_LEX_UNIT;
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template <class T>
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class List;
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/**
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Formatter for the traditional EXPLAIN output
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*/
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class Explain_format_traditional : public Explain_format {
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class Item_null *nil;
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qep_row column_buffer; ///< buffer for the current output row
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public:
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Explain_format_traditional() : nil(NULL) {}
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virtual bool is_hierarchical() const { return false; }
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virtual bool send_headers(Query_result *result);
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virtual bool begin_context(enum_parsing_context, SELECT_LEX_UNIT *,
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const Explain_format_flags *) {
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return false;
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}
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virtual bool end_context(enum_parsing_context) { return false; }
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virtual bool flush_entry();
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virtual qep_row *entry() { return &column_buffer; }
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private:
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bool push_select_type(List<Item> *items);
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};
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class Explain_format_tree : public Explain_format {
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public:
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Explain_format_tree() {}
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bool is_hierarchical() const override { return false; }
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bool send_headers(Query_result *) override {
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DBUG_ASSERT(false);
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return true;
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}
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bool begin_context(enum_parsing_context, SELECT_LEX_UNIT *,
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const Explain_format_flags *) override {
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DBUG_ASSERT(false);
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return true;
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}
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bool end_context(enum_parsing_context) override {
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DBUG_ASSERT(false);
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return true;
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}
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bool flush_entry() override {
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DBUG_ASSERT(false);
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return true;
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}
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qep_row *entry() override {
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DBUG_ASSERT(false);
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return nullptr;
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}
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bool is_tree() const override { return true; }
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private:
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bool push_select_type(List<Item> *items);
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};
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#endif // OPT_EXPLAIN_FORMAT_TRADITIONAL_INCLUDED
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