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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2008 Sun Microsystems
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef DRIZZLED_TMP_TABLE_PARAM_H
#define DRIZZLED_TMP_TABLE_PARAM_H
namespace drizzled
{
/*
Param to create temporary tables when doing SELECT:s
NOTE
This structure is copied using memcpy as a part of JOIN.
*/
class Tmp_Table_Param :public memory::SqlAlloc
{
private:
/* Prevent use of these (not safe because of lists and copy_field) */
Tmp_Table_Param(const Tmp_Table_Param &);
void operator=(Tmp_Table_Param &);
public:
KeyInfo *keyinfo;
List<Item> copy_funcs;
List<Item> save_copy_funcs;
CopyField *copy_field, *copy_field_end;
CopyField *save_copy_field, *save_copy_field_end;
unsigned char *group_buff;
Item **items_to_copy; /* Fields in tmp table */
MI_COLUMNDEF *recinfo,*start_recinfo;
ha_rows end_write_records;
uint32_t field_count;
uint32_t sum_func_count;
uint32_t func_count;
uint32_t hidden_field_count;
uint32_t group_parts,group_length,group_null_parts;
uint32_t quick_group;
bool using_indirect_summary_function;
bool schema_table;
/*
True if GROUP BY and its aggregate functions are already computed
by a table access method (e.g. by loose index scan). In this case
query execution should not perform aggregation and should treat
aggregate functions as normal functions.
*/
bool precomputed_group_by;
bool force_copy_fields;
/* If >0 convert all blob fields to varchar(convert_blob_length) */
uint32_t convert_blob_length;
const CHARSET_INFO *table_charset;
Tmp_Table_Param()
:copy_field(0),
group_parts(0),
group_length(0),
group_null_parts(0),
schema_table(false),
precomputed_group_by(false),
force_copy_fields(false),
convert_blob_length(0)
{}
~Tmp_Table_Param()
{
cleanup();
}
void init(void);
void cleanup(void);
};
} /* namespace drizzled */
#endif /* DRIZZLED_TMP_TABLE_PARAM_H */
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