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08c852026d
This patch is the result of running run-clang-tidy -fix -header-filter=.* -checks='-*,modernize-use-equals-default' . Code style changes have been done on top. The result of this change leads to the following improvements: 1. Binary size reduction. * For a -DBUILD_CONFIG=mysql_release build, the binary size is reduced by ~400kb. * A raw -DCMAKE_BUILD_TYPE=Release reduces the binary size by ~1.4kb. 2. Compiler can better understand the intent of the code, thus it leads to more optimization possibilities. Additionally it enabled detecting unused variables that had an empty default constructor but not marked so explicitly. Particular change required following this patch in sql/opt_range.cc result_keys, an unused template class Bitmap now correctly issues unused variable warnings. Setting Bitmap template class constructor to default allows the compiler to identify that there are no side-effects when instantiating the class. Previously the compiler could not issue the warning as it assumed Bitmap class (being a template) would not be performing a NO-OP for its default constructor. This prevented the "unused variable warning".
71 lines
2 KiB
C++
71 lines
2 KiB
C++
#ifndef SQL_TRUNCATE_INCLUDED
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#define SQL_TRUNCATE_INCLUDED
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/* Copyright (c) 2010, 2014, 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 02110-1335 USA */
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class THD;
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struct TABLE_LIST;
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/**
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Sql_cmd_truncate_table represents the TRUNCATE statement.
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*/
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class Sql_cmd_truncate_table : public Sql_cmd
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{
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private:
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/* Set if a lock must be downgraded after truncate is done. */
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MDL_ticket *m_ticket_downgrade;
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public:
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/**
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Constructor, used to represent a TRUNCATE statement.
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*/
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Sql_cmd_truncate_table() = default;
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virtual ~Sql_cmd_truncate_table() = default;
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/**
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Execute a TRUNCATE statement at runtime.
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@param thd the current thread.
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@return false on success.
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*/
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bool execute(THD *thd);
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virtual enum_sql_command sql_command_code() const
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{
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return SQLCOM_TRUNCATE;
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}
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protected:
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enum truncate_result{
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TRUNCATE_OK=0,
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TRUNCATE_FAILED_BUT_BINLOG,
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TRUNCATE_FAILED_SKIP_BINLOG
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};
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/** Handle locking a base table for truncate. */
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bool lock_table(THD *, TABLE_LIST *, bool *);
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/** Truncate table via the handler method. */
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enum truncate_result handler_truncate(THD *, TABLE_LIST *, bool);
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/**
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Optimized delete of all rows by doing a full regenerate of the table.
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Depending on the storage engine, it can be accomplished through a
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drop and recreate or via the handler truncate method.
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*/
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bool truncate_table(THD *, TABLE_LIST *);
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};
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#endif
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