Record manager. More...

#include <stddef.h>
#include "dict0dict.h"
#include "mem0mem.h"
#include "rem/rec.h"
#include "rem0lrec.h"
#include "rem0rec.h"

Functions
static void	rec_init_offsets_new (const rec_t rec, const dict_index_t index, ulint *offsets)
	NOTE: The functions in this file should only use functions from other files in library. More...

static void	rec_init_offset_old_1byte (const rec_t rec, const dict_index_t index, ulint *offsets, uint8_t row_version)
	Initialize offsets for record in REDUNDNT format when each field offsets is stored in 1 byte. More...

static void	rec_init_offset_old_2byte (const rec_t rec, const dict_index_t index, ulint *offsets, uint8_t row_version)
	Initialize offsets for record in REDUNDNT format when each field offsets is stored in 2 byte. More...

static void	rec_init_offsets_old (const rec_t rec, const dict_index_t index, ulint *offsets)
	Initialize offset for each field in an old style record. More...

void	rec_init_offsets (const rec_t rec, const dict_index_t index, ulint *offsets)
	The following function determines the offsets to each field in the record. More...

ulint *	rec_get_offsets (const rec_t rec, const dict_index_t index, ulint offsets, ulint n_fields, ut::Location location, mem_heap_t *heap)
	The following function determines the offsets to each field in the record. More...

void	rec_get_offsets_reverse (const byte extra, const dict_index_t index, ulint node_ptr, ulint *offsets)
	The following function determines the offsets to each field in the record. More...

bool	rec_offs_cmp (ulint offsets1, ulint offsets2)
	Check if the given two record offsets are identical. More...

std::ostream &	rec_offs_print (std::ostream &out, const ulint *offsets)
	Print the record offsets. More...

Detailed Description

Record manager.

Created 5/30/1994 Heikki Tuuri

Function Documentation

◆ rec_get_offsets()

ulint * rec_get_offsets	(	const rec_t *	rec,
		const dict_index_t *	index,
		ulint *	offsets,
		ulint	n_fields,
		ut::Location	location,
		mem_heap_t **	heap
	)

The following function determines the offsets to each field in the record.

It can reuse a previously allocated array. Note that after instant ADD COLUMN, if this is a record from clustered index, fields in the record may be less than the fields defined in the clustered index. So the offsets size is allocated according to the clustered index fields.

Parameters

[in]	rec	physical record
[in]	index	record descriptor
[in,out]	offsets	array consisting of offsets[0] allocated elements, or an array from rec_get_offsets(), or NULL
[in]	n_fields	maximum number of initialized fields (ULINT_UNDEFINED is all fields)
[in]	location	location where called
[in,out]	heap	memory heap

Returns: the new offsets

◆ rec_get_offsets_reverse()

void rec_get_offsets_reverse	(	const byte *	extra,
		const dict_index_t *	index,
		ulint	node_ptr,
		ulint *	offsets
	)

The following function determines the offsets to each field in the record.

It can reuse a previously allocated array.

Parameters

extra	in: the extra bytes of a compact record in reverse order, excluding the fixed-size REC_N_NEW_EXTRA_BYTES
index	in: record descriptor
node_ptr	in: nonzero=node pointer, 0=leaf node
offsets	in/out: array consisting of offsets[0] allocated elements

◆ rec_init_offset_old_1byte()

static void rec_init_offset_old_1byte	(	const rec_t *	rec,
		const dict_index_t *	index,
		ulint *	offsets,
		uint8_t	row_version
	)

static

Initialize offsets for record in REDUNDNT format when each field offsets is stored in 1 byte.

Parameters

[in]	rec	physical record
[in]	index	record descriptor
[in,out]	offsets	array of offsets
[in]	row_version	row version in record

◆ rec_init_offset_old_2byte()

static void rec_init_offset_old_2byte	(	const rec_t *	rec,
		const dict_index_t *	index,
		ulint *	offsets,
		uint8_t	row_version
	)

static

Initialize offsets for record in REDUNDNT format when each field offsets is stored in 2 byte.

Parameters

[in]	rec	physical record
[in]	index	record descriptor
[in,out]	offsets	array of offsets
[in]	row_version	row version in record

◆ rec_init_offsets()

void rec_init_offsets	(	const rec_t *	rec,
		const dict_index_t *	index,
		ulint *	offsets
	)

The following function determines the offsets to each field in the record.

The offsets are written to a previously allocated array of ulint, where rec_offs_n_fields(offsets) has been initialized to the number of fields in the record. The rest of the array will be initialized by this function.

rec_offs_base(offsets)[0] will be set to the extra size (if REC_OFFS_COMPACT is set, the record is in the new format; if REC_OFFS_EXTERNAL is set, the record contains externally stored columns).
rec_offs_base(offsets)[1..n_fields] will be set to offsets past the end of fields 0..n_fields, or to the beginning of fields 1..n_fields+1.
If the high-order bit of the offset at [i+1] is set (REC_OFFS_SQL_NULL), the field i is NULL.
If the second high-order bit of the offset at [i+1] is set (REC_OFFS_EXTERNAL), the field i is being stored externally.
Parameters

[in] rec physical record

[in] index record descriptor

[in,out] offsets array of offsets

◆ rec_init_offsets_new()

static void rec_init_offsets_new	(	const rec_t *	rec,
		const dict_index_t *	index,
		ulint *	offsets
	)

static

NOTE: The functions in this file should only use functions from other files in library.

The code in this file is used to make a library for external tools. Initialize offset for each field in a new style record.

Parameters

[in]	rec	physical record
[in]	index	record descriptor
[in,out]	offsets	array of offsets

◆ rec_init_offsets_old()

static void rec_init_offsets_old	(	const rec_t *	rec,
		const dict_index_t *	index,
		ulint *	offsets
	)

static

Initialize offset for each field in an old style record.

Parameters

[in]	rec	physical record
[in]	index	record descriptor
[in,out]	offsets	array of offsets

◆ rec_offs_cmp()

bool rec_offs_cmp	(	ulint *	offsets1,
		ulint *	offsets2
	)

Check if the given two record offsets are identical.

Parameters

[in]	offsets1	field offsets of a record
[in]	offsets2	field offsets of a record

Returns: true if they are identical, false otherwise.

◆ rec_offs_print()

std::ostream & rec_offs_print	(	std::ostream &	out,
		const ulint *	offsets
	)

Print the record offsets.

Parameters

[in]	out	the output stream to which offsets are printed.
[in]	offsets	the field offsets of the record.

Returns: the output stream.

Functions

Detailed Description

Function Documentation

◆ rec_get_offsets()

◆ rec_get_offsets_reverse()

◆ rec_init_offset_old_1byte()

◆ rec_init_offset_old_2byte()

◆ rec_init_offsets()

◆ rec_init_offsets_new()

◆ rec_init_offsets_old()

◆ rec_offs_cmp()

◆ rec_offs_print()