row0ext.h File Reference

Caching of externally stored column prefixes. More...

#include "data0types.h"
#include "dict0types.h"
#include "mem0mem.h"
#include "page0size.h"
#include "row0types.h"
#include "univ.i"
#include "row0ext.ic"

Go to the source code of this file.

Classes
struct	row_ext_t
	Prefixes of externally stored columns. More...

Functions
row_ext_t *	row_ext_create_func (const dict_index_t *index, ulint n_ext, const ulint *ext, uint32_t flags, const dtuple_t *tuple, bool is_sdi, mem_heap_t *heap)
	Creates a cache of column prefixes of externally stored columns. More...
static row_ext_t *	row_ext_create (const dict_index_t *index, ulint n_ext, const ulint *ext, uint32_t flags, const dtuple_t *tuple, bool is_sdi, mem_heap_t *heap)
static const byte *	row_ext_lookup_ith (const row_ext_t *ext, ulint i, ulint *len)
	Looks up a column prefix of an externally stored column. More...
static const byte *	row_ext_lookup (const row_ext_t *ext, ulint col, ulint *len)
	Looks up a column prefix of an externally stored column. More...
std::ostream &	operator<< (std::ostream &out, const row_ext_t &obj)

Detailed Description

Caching of externally stored column prefixes.

Created September 2006 Marko Makela

Function Documentation

operator<<()

std::ostream & operator<< ( std::ostream &  out, const row_ext_t &  obj  )

inline

row_ext_create()

static row_ext_t * row_ext_create ( const dict_index_t *  index, ulint  n_ext, const ulint *  ext, uint32_t  flags, const dtuple_t *  tuple, bool  is_sdi, mem_heap_t *  heap  )

inlinestatic

row_ext_create_func()

row_ext_t * row_ext_create_func	(	const dict_index_t *	index,
		ulint	n_ext,
		const ulint *	ext,
		uint32_t	flags,
		const dtuple_t *	tuple,
		bool	is_sdi,
		mem_heap_t *	heap
	)

Creates a cache of column prefixes of externally stored columns.

Parameters

[in]	index	the index to which LOB belongs.
[in]	n_ext	number of externally stored columns
[in]	ext	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
[in]	flags	table->flags
[in]	tuple	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)
[in]	is_sdi	true for SDI Indexes
[in,out]	heap	heap where created

Returns

own: column prefix cache

row_ext_lookup()

static const byte * row_ext_lookup ( const row_ext_t *  ext, ulint  col, ulint *  len  )

inlinestatic

Looks up a column prefix of an externally stored column.

Parameters

[in]	ext	column prefix cache
[in]	col	column number in the InnoDB table object, as reported by dict_col_get_no(); NOT relative to the records in the clustered index
[out]	len	length of prefix, in bytes, at most the length determined by DICT_MAX_FIELD_LEN_BY_FORMAT()

Returns

column prefix, or NULL if the column is not stored externally, or pointer to field_ref_zero if the BLOB pointer is unset

row_ext_lookup_ith()

static const byte * row_ext_lookup_ith ( const row_ext_t *  ext, ulint  i, ulint *  len  )

inlinestatic

Looks up a column prefix of an externally stored column.

Parameters

[in,out]	ext	column prefix cache
[in]	i	index of ext->ext[]
[out]	len	length of prefix, in bytes, at most the length determined by DICT_MAX_FIELD_LEN_BY_FORMAT()

Returns

column prefix, or NULL if the column is not stored externally, or pointer to field_ref_zero if the BLOB pointer is unset