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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 producing 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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