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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 FILESORT_INCLUDED

#define FILESORT_INCLUDED

class SQL_SELECT;

#include "my_global.h" /* uint, uchar */

#include "my_base.h" /* ha_rows */

#include "sql_list.h" /* Sql_alloc */

class SQL_SELECT;

class THD;

struct TABLE;

typedef struct st_sort_field SORT_FIELD;

typedef struct st_order ORDER;

/**

Sorting related info.

To be extended by another WL to include complete filesort implementation.

class Filesort: public Sql_alloc

{

public:

/** List of expressions to order the table by */

ORDER *order;

/** Number of records to return */

ha_rows limit;

/** ORDER BY list with some precalculated info for filesort */

SORT_FIELD *sortorder;

/** select to use for getting records */

SQL_SELECT *select;

/** TRUE <=> free select on destruction */

bool own_select;

Filesort(ORDER *order_arg, ha_rows limit_arg, SQL_SELECT *select_arg):

order(order_arg),

limit(limit_arg),

sortorder(NULL),

select(select_arg),

own_select(false)

{

DBUG_ASSERT(order);

};

~Filesort() { cleanup(); }

/* Prepare ORDER BY list for sorting. */

uint make_sortorder();

private:

void cleanup();

};

ha_rows filesort(THD *thd, TABLE *table, Filesort *fsort, bool sort_positions,

ha_rows *examined_rows, ha_rows *found_rows);

void filesort_free_buffers(TABLE *table, bool full);

void change_double_for_sort(double nr,uchar *to);

class Sort_param;

/// Declared here so we can unit test it.

void make_sortkey(Sort_param *param, uchar *to, uchar *ref_pos);

/// Declared here so we can unit test it.

uint sortlength(THD *thd, SORT_FIELD *sortorder, uint s_length,

bool *multi_byte_charset);

#endif /* FILESORT_INCLUDED */

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