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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".
85 lines
2.3 KiB
Objective-C
85 lines
2.3 KiB
Objective-C
/*
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Copyright (c) 2016, 2017 MariaDB
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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 02110-1301 USA */
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#ifndef DERIVED_HANDLER_INCLUDED
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#define DERIVED_HANDLER_INCLUDED
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#include "mariadb.h"
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#include "sql_priv.h"
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class TMP_TABLE_PARAM;
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typedef class st_select_lex_unit SELECT_LEX_UNIT;
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/**
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@class derived_handler
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This interface class is to be used for execution of queries that specify
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derived table by foreign engines
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*/
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class derived_handler
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{
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public:
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THD *thd;
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handlerton *ht;
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TABLE_LIST *derived;
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/*
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Temporary table where all results should be stored in record[0]
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The table has a field for every item from the select list of
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the specification of derived.
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*/
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TABLE *table;
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/* The parameters if the temporary table used at its creation */
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TMP_TABLE_PARAM *tmp_table_param;
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SELECT_LEX_UNIT *unit; // Specifies the derived table
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SELECT_LEX *select; // The first select of the specification
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derived_handler(THD *thd_arg, handlerton *ht_arg)
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: thd(thd_arg), ht(ht_arg), derived(0),table(0), tmp_table_param(0),
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unit(0), select(0) {}
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virtual ~derived_handler() = default;
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/*
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Functions to scan data. All these returns 0 if ok, error code in case
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of error
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*/
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/* Initialize the process of producing rows of the derived table */
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virtual int init_scan()= 0;
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/*
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Put the next produced row of the derived in table->record[0] and return 0.
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Return HA_ERR_END_OF_FILE if there are no more rows, return other error
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number in case of fatal error.
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*/
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virtual int next_row()= 0;
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/* End prodicing rows */
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virtual int end_scan()=0;
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/* Report errors */
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virtual void print_error(int error, myf errflag);
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void set_derived(TABLE_LIST *tbl);
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};
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#endif /* DERIVED_HANDLER_INCLUDED */
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