mirror of
https://github.com/MariaDB/server.git
synced 2025-01-22 23:04:20 +01:00
f2e8426752
* Remove old Innobase copyright lines from C source files * Add a reference to the GPLv2 license as recommended by the lawyers at Oracle Legal [Step 15/28]
98 lines
3.5 KiB
C
98 lines
3.5 KiB
C
/*****************************************************************************
|
|
|
|
Copyright (c) 2006, 2009, Innobase Oy. All Rights Reserved.
|
|
|
|
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., 59 Temple
|
|
Place, Suite 330, Boston, MA 02111-1307 USA
|
|
|
|
*****************************************************************************/
|
|
|
|
/******************************************************
|
|
Caching of externally stored column prefixes
|
|
|
|
Created September 2006 Marko Makela
|
|
*******************************************************/
|
|
|
|
#ifndef row0ext_h
|
|
#define row0ext_h
|
|
|
|
#include "univ.i"
|
|
#include "row0types.h"
|
|
#include "data0types.h"
|
|
#include "mem0mem.h"
|
|
|
|
/************************************************************************
|
|
Creates a cache of column prefixes of externally stored columns. */
|
|
UNIV_INTERN
|
|
row_ext_t*
|
|
row_ext_create(
|
|
/*===========*/
|
|
/* out,own: column prefix cache */
|
|
ulint n_ext, /* in: number of externally stored columns */
|
|
const ulint* ext, /* in: col_no's of externally stored columns
|
|
in the InnoDB table object, as reported by
|
|
dict_col_get_no(); NOT relative to the records
|
|
in the clustered index */
|
|
const dtuple_t* tuple, /* in: data tuple containing the field
|
|
references of the externally stored
|
|
columns; must be indexed by col_no;
|
|
the clustered index record must be
|
|
covered by a lock or a page latch
|
|
to prevent deletion (rollback or purge). */
|
|
ulint zip_size,/* compressed page size in bytes, or 0 */
|
|
mem_heap_t* heap); /* in: heap where created */
|
|
|
|
/************************************************************************
|
|
Looks up a column prefix of an externally stored column. */
|
|
UNIV_INLINE
|
|
const byte*
|
|
row_ext_lookup_ith(
|
|
/*===============*/
|
|
/* out: column prefix, or NULL if
|
|
the column is not stored externally,
|
|
or pointer to field_ref_zero
|
|
if the BLOB pointer is unset */
|
|
const row_ext_t* ext, /* in/out: column prefix cache */
|
|
ulint i, /* in: index of ext->ext[] */
|
|
ulint* len); /* out: length of prefix, in bytes,
|
|
at most REC_MAX_INDEX_COL_LEN */
|
|
/************************************************************************
|
|
Looks up a column prefix of an externally stored column. */
|
|
UNIV_INLINE
|
|
const byte*
|
|
row_ext_lookup(
|
|
/*===========*/
|
|
/* out: column prefix, or NULL if
|
|
the column is not stored externally,
|
|
or pointer to field_ref_zero
|
|
if the BLOB pointer is unset */
|
|
const row_ext_t* ext, /* in: column prefix cache */
|
|
ulint col, /* in: column number in the InnoDB
|
|
table object, as reported by
|
|
dict_col_get_no(); NOT relative to the
|
|
records in the clustered index */
|
|
ulint* len); /* out: length of prefix, in bytes,
|
|
at most REC_MAX_INDEX_COL_LEN */
|
|
|
|
/* Prefixes of externally stored columns */
|
|
struct row_ext_struct{
|
|
ulint n_ext; /* number of externally stored columns */
|
|
const ulint* ext; /* col_no's of externally stored columns */
|
|
byte* buf; /* backing store of the column prefix cache */
|
|
ulint len[1]; /* prefix lengths; 0 if not cached */
|
|
};
|
|
|
|
#ifndef UNIV_NONINL
|
|
#include "row0ext.ic"
|
|
#endif
|
|
|
|
#endif
|