1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
|
/*****************************************************************************
Copyright (c) 2006, 2016, Oracle and/or its affiliates. All Rights Reserved.
Copyright (c) 2019, MariaDB Corporation.
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 Street, Fifth Floor, Boston, MA 02110-1335 USA
*****************************************************************************/
/**************************************************//**
@file include/row0ext.h
Caching of externally stored column prefixes
Created September 2006 Marko Makela
*******************************************************/
#ifndef row0ext_h
#define row0ext_h
#include "data0types.h"
#include "mem0mem.h"
#include "dict0types.h"
#include "fsp0types.h"
#include "row0types.h"
/********************************************************************//**
Creates a cache of column prefixes of externally stored columns.
@return own: column prefix cache */
row_ext_t*
row_ext_create(
/*===========*/
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 dict_table_t& table, /*!< in: table */
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). */
mem_heap_t* heap); /*!< in: heap where created */
/********************************************************************//**
Looks up a column prefix of an externally stored column.
@return column prefix, or NULL if the column is not stored externally,
or pointer to field_ref_zero if the BLOB pointer is unset */
UNIV_INLINE
const byte*
row_ext_lookup_ith(
/*===============*/
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 the length determined by
DICT_MAX_FIELD_LEN_BY_FORMAT() */
/********************************************************************//**
Looks up a column prefix of an externally stored column.
@return column prefix, or NULL if the column is not stored externally,
or pointer to field_ref_zero if the BLOB pointer is unset */
UNIV_INLINE
const byte*
row_ext_lookup(
/*===========*/
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 the length determined by
DICT_MAX_FIELD_LEN_BY_FORMAT() */
/** Prefixes of externally stored columns */
struct row_ext_t{
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 max_len;/*!< maximum prefix length, it could be
REC_ANTELOPE_MAX_INDEX_COL_LEN or
REC_VERSION_56_MAX_INDEX_COL_LEN depending
on row format */
ulint zip_size;/*!< ROW_FORMAT=COMPRESSED page size, or 0 */
ulint len[1]; /*!< prefix lengths; 0 if not cached */
};
#include "row0ext.inl"
#endif
|
