The page cursor. More...

#include "page0cur.h"
#include "btr0btr.h"
#include "ha_prototypes.h"
#include "log0recv.h"
#include "mtr0log.h"
#include <algorithm>
#include "page0zip.h"
#include "gis0rtree.h"
#include "rem0cmp.h"

Functions
static bool	page_cur_has_null (const rec_t rec, const dict_index_t index)
	Check if rec has at least one NULL value among the columns for which rec_cache.offsets was cached, which means rec_cache.offsets should not be used for this rec as it has a different layout of fields than the cached version. More...

void	page_cur_search_with_match (const buf_block_t block, const dict_index_t index, const dtuple_t tuple, page_cur_mode_t mode, ulint iup_matched_fields, ulint ilow_matched_fields, page_cur_t cursor, rtr_info_t *rtr_info)
	Searches the right position for a page cursor. More...

void	page_cur_search_with_match_bytes (const buf_block_t block, const dict_index_t index, const dtuple_t tuple, page_cur_mode_t mode, ulint iup_matched_fields, ulint iup_matched_bytes, ulint ilow_matched_fields, ulint ilow_matched_bytes, page_cur_t cursor)
	Search the right position for a page cursor. More...

void	page_cur_open_on_rnd_user_rec (buf_block_t block, page_cur_t cursor)
	Positions a page cursor on a randomly chosen user record on a page. More...

static void	page_cur_insert_rec_write_log (rec_t insert_rec, ulint rec_size, rec_t cursor_rec, dict_index_t index, mtr_t mtr)
	Writes the log record of a record insert on a page. More...

const byte *	page_cur_parse_insert_rec (bool is_short, const byte ptr, const byte end_ptr, buf_block_t block, dict_index_t index, mtr_t *mtr)
	Parses a log record of a record insert on a page. More...

rec_t *	page_cur_insert_rec_low (rec_t current_rec, dict_index_t index, const rec_t rec, ulint offsets, mtr_t *mtr)
	Inserts a record next to page cursor on an uncompressed page. More...

rec_t *	page_cur_direct_insert_rec_low (rec_t current_rec, dict_index_t index, const dtuple_t tuple, mtr_t mtr, ulint rec_size)
	Inserts a record next to page cursor on an uncompressed page. More...

rec_t *	page_cur_insert_rec_zip (page_cur_t cursor, dict_index_t index, const rec_t rec, ulint offsets, mtr_t *mtr)
	Inserts a record next to page cursor on a compressed and uncompressed page. More...

static bool	page_copy_rec_list_to_created_page_write_log (page_t page, dict_index_t index, mtr_t mtr, byte &log_ptr)
	Writes a log record of copying a record list end to a new created page. More...

const byte *	page_parse_copy_rec_list_to_created_page (const byte ptr, const byte end_ptr, buf_block_t block, dict_index_t index, mtr_t *mtr)
	Parses a log record of copying a record list end to a new created page. More...

void	page_copy_rec_list_end_to_created_page (page_t new_page, rec_t rec, dict_index_t index, mtr_t mtr)
	Copies records from page to a newly created page, from a given record onward, including that record. More...

static void	page_cur_delete_rec_write_log (rec_t rec, const dict_index_t index, mtr_t *mtr)
	Writes log record of a record delete on a page. More...

const byte *	page_cur_parse_delete_rec (const byte ptr, const byte end_ptr, buf_block_t block, dict_index_t index, mtr_t *mtr)
	Parses log record of a record delete on a page. More...

void	page_cur_delete_rec (page_cur_t cursor, const dict_index_t index, const ulint offsets, mtr_t mtr)
	Deletes a record at the page cursor. More...

Detailed Description

The page cursor.

Created 10/4/1994 Heikki Tuuri

Function Documentation

◆ page_copy_rec_list_end_to_created_page()

void page_copy_rec_list_end_to_created_page	(	page_t *	new_page,
		rec_t *	rec,
		dict_index_t *	index,
		mtr_t *	mtr
	)

Copies records from page to a newly created page, from a given record onward, including that record.

Infimum and supremum records are not copied.

IMPORTANT: The caller will have to update IBUF_BITMAP_FREE if this is a compressed leaf page in a secondary index. This has to be done either within the same mini-transaction, or by invoking ibuf_reset_free_bits() before mtr_commit().

Parameters

new_page	in/out: index page to copy to
rec	in: first record to copy
index	in: record descriptor
mtr	in: mtr

◆ page_copy_rec_list_to_created_page_write_log()

static bool page_copy_rec_list_to_created_page_write_log	(	page_t *	page,
		dict_index_t *	index,
		mtr_t *	mtr,
		byte *&	log_ptr
	)

inlinestatic

Writes a log record of copying a record list end to a new created page.

Parameters

[in,out]	page	Index page
[in,out]	index	Record descriptor
[in,out]	mtr	Mini-transaction
[out]	log_ptr	4-byte field where to write the log data length

Return values

true	if mtr log is opened successfully.
false	if mtr log is not opened. One case is when redo is disabled.

◆ page_cur_delete_rec()

void page_cur_delete_rec	(	page_cur_t *	cursor,
		const dict_index_t *	index,
		const ulint *	offsets,
		mtr_t *	mtr
	)

Deletes a record at the page cursor.

The cursor is moved to the next record after the deleted one.

Parameters

cursor	in/out: a page cursor
index	in: record descriptor
offsets	in: rec_get_offsets( cursor->rec, index)
mtr	in: mini-transaction handle or NULL

◆ page_cur_delete_rec_write_log()

static void page_cur_delete_rec_write_log	(	rec_t *	rec,
		const dict_index_t *	index,
		mtr_t *	mtr
	)

inlinestatic

Writes log record of a record delete on a page.

Parameters

rec	in: record to be deleted
index	in: record descriptor
mtr	in: mini-transaction handle

◆ page_cur_direct_insert_rec_low()

rec_t * page_cur_direct_insert_rec_low	(	rec_t *	current_rec,
		dict_index_t *	index,
		const dtuple_t *	tuple,
		mtr_t *	mtr,
		ulint	rec_size
	)

Inserts a record next to page cursor on an uncompressed page.

Parameters

[in]	current_rec	Pointer to current record after which the new record is inserted.
[in]	index	Record descriptor
[in]	tuple	Pointer to a data tuple
[in]	mtr	Mini-transaction handle, or NULL
[in]	rec_size	The size of new record

Returns: pointer to record if succeed, NULL otherwise

< the relevant page

< cursor position at previous insert

< a free record that was reused, or NULL

< inserted record

< heap number of the inserted record

◆ page_cur_has_null()

static bool page_cur_has_null	(	const rec_t *	rec,
		const dict_index_t *	index
	)

static

Check if rec has at least one NULL value among the columns for which rec_cache.offsets was cached, which means rec_cache.offsets should not be used for this rec as it has a different layout of fields than the cached version.

Parameters

[in]	rec	B-Tree record
[in]	index	The index from which the rec was taken

Returns: true iff the rec has at least one relevant column with NULL

◆ page_cur_insert_rec_low()

rec_t * page_cur_insert_rec_low	(	rec_t *	current_rec,
		dict_index_t *	index,
		const rec_t *	rec,
		ulint *	offsets,
		mtr_t *	mtr
	)

Inserts a record next to page cursor on an uncompressed page.

Returns pointer to inserted record if succeed, i.e., enough space available, NULL otherwise. The cursor stays at the same position.

Returns: pointer to record if succeed, NULL otherwise

< the relevant page

< cursor position at previous insert

< a free record that was reused, or NULL

< inserted record

< heap number of the inserted record

Parameters

current_rec	in: pointer to current record after which the new record is inserted
index	in: record descriptor
rec	in: pointer to a physical record
offsets	in/out: rec_get_offsets(rec, index)
mtr	in: mini-transaction handle, or NULL

◆ page_cur_insert_rec_write_log()

static void page_cur_insert_rec_write_log	(	rec_t *	insert_rec,
		ulint	rec_size,
		rec_t *	cursor_rec,
		dict_index_t *	index,
		mtr_t *	mtr
	)

static

Writes the log record of a record insert on a page.

Parameters

insert_rec	in: inserted physical record
rec_size	in: insert_rec size
cursor_rec	in: record the cursor is pointing to
index	in: record descriptor
mtr	in: mini-transaction handle

◆ page_cur_insert_rec_zip()

rec_t * page_cur_insert_rec_zip	(	page_cur_t *	cursor,
		dict_index_t *	index,
		const rec_t *	rec,
		ulint *	offsets,
		mtr_t *	mtr
	)

Inserts a record next to page cursor on a compressed and uncompressed page.

Returns pointer to inserted record if succeed, i.e., enough space available, NULL otherwise. The cursor stays at the same position.

IMPORTANT: The caller will have to update IBUF_BITMAP_FREE if this is a compressed leaf page in a secondary index. This has to be done either within the same mini-transaction, or by invoking ibuf_reset_free_bits() before mtr_commit().

Returns: pointer to record if succeed, NULL otherwise

< the relevant page

< cursor position at previous insert

< a free record that was reused, or NULL

< inserted record

< heap number of the inserted record

Parameters

cursor	in/out: page cursor
index	in: record descriptor
rec	in: pointer to a physical record
offsets	in/out: rec_get_offsets(rec, index)
mtr	in: mini-transaction handle, or NULL

◆ page_cur_open_on_rnd_user_rec()

void page_cur_open_on_rnd_user_rec	(	buf_block_t *	block,
		page_cur_t *	cursor
	)

Positions a page cursor on a randomly chosen user record on a page.

If there are no user records, sets the cursor on the infimum record.

Parameters

block	in: page
cursor	out: page cursor

◆ page_cur_parse_delete_rec()

const byte * page_cur_parse_delete_rec	(	const byte *	ptr,
		const byte *	end_ptr,
		buf_block_t *	block,
		dict_index_t *	index,
		mtr_t *	mtr
	)

Parses log record of a record delete on a page.

Returns: pointer to record end or NULL

Parameters

ptr	in: buffer
end_ptr	in: buffer end
block	in: page or NULL
index	in: record descriptor
mtr	in: mtr or NULL

◆ page_cur_parse_insert_rec()

const byte * page_cur_parse_insert_rec	(	bool	is_short,
		const byte *	ptr,
		const byte *	end_ptr,
		buf_block_t *	block,
		dict_index_t *	index,
		mtr_t *	mtr
	)

Parses a log record of a record insert on a page.

Returns: end of log record or NULL

Parameters

is_short	in: true if short inserts
ptr	in: buffer
end_ptr	in: buffer end
block	in: page or NULL
index	in: record descriptor
mtr	in: mtr or NULL

◆ page_cur_search_with_match()

void page_cur_search_with_match	(	const buf_block_t *	block,
		const dict_index_t *	index,
		const dtuple_t *	tuple,
		page_cur_mode_t	mode,
		ulint *	iup_matched_fields,
		ulint *	ilow_matched_fields,
		page_cur_t *	cursor,
		rtr_info_t *	rtr_info
	)

Searches the right position for a page cursor.

Parameters

[in]	block	Buffer block
[in]	index	Record descriptor
[in]	tuple	Data tuple
[in]	mode	PAGE_CUR_L, PAGE_CUR_LE, PAGE_CUR_G, or PAGE_CUR_GE
[in,out]	iup_matched_fields	Already matched fields in upper limit record
[in,out]	ilow_matched_fields	Already matched fields in lower limit record
[out]	cursor	Page cursor
[in,out]	rtr_info	Rtree search stack

◆ page_cur_search_with_match_bytes()

void page_cur_search_with_match_bytes	(	const buf_block_t *	block,
		const dict_index_t *	index,
		const dtuple_t *	tuple,
		page_cur_mode_t	mode,
		ulint *	iup_matched_fields,
		ulint *	iup_matched_bytes,
		ulint *	ilow_matched_fields,
		ulint *	ilow_matched_bytes,
		page_cur_t *	cursor
	)

Search the right position for a page cursor.

Parameters

[in]	block	buffer block
[in]	index	index tree
[in]	tuple	key to be searched for
[in]	mode	search mode
[in,out]	iup_matched_fields	already matched fields in the upper limit record
[in,out]	iup_matched_bytes	already matched bytes in the first partially matched field in the upper limit record
[in,out]	ilow_matched_fields	already matched fields in the lower limit record
[in,out]	ilow_matched_bytes	already matched bytes in the first partially matched field in the lower limit record
[out]	cursor	page cursor

◆ page_parse_copy_rec_list_to_created_page()

const byte * page_parse_copy_rec_list_to_created_page	(	const byte *	ptr,
		const byte *	end_ptr,
		buf_block_t *	block,
		dict_index_t *	index,
		mtr_t *	mtr
	)

Parses a log record of copying a record list end to a new created page.

Returns: end of log record or NULL

Parameters

ptr	in: buffer
end_ptr	in: buffer end
block	in: page or NULL
index	in: record descriptor
mtr	in: mtr or NULL

Functions

Detailed Description

Function Documentation

◆ page_copy_rec_list_end_to_created_page()

◆ page_copy_rec_list_to_created_page_write_log()

◆ page_cur_delete_rec()

◆ page_cur_delete_rec_write_log()

◆ page_cur_direct_insert_rec_low()

◆ page_cur_has_null()

◆ page_cur_insert_rec_low()

◆ page_cur_insert_rec_write_log()

◆ page_cur_insert_rec_zip()

◆ page_cur_open_on_rnd_user_rec()

◆ page_cur_parse_delete_rec()

◆ page_cur_parse_insert_rec()

◆ page_cur_search_with_match()

◆ page_cur_search_with_match_bytes()

◆ page_parse_copy_rec_list_to_created_page()