mirror of
https://github.com/MariaDB/server.git
synced 2025-01-20 14:02:32 +01:00
1f510066f4
in the clustered index to be smaller than the indexed prefix in secondary indexes. row_ext_lookup(): Return NULL if the column is not stored externally. trx_undo_rec_get_partial_row(): row_build(): Add parameter row_ext_t** ext. row_build_index_entry(): Add the parameter row_ext_t* ext. Invoke row_ext_lookup() to fetch prefixes of externally stored columns. upd_node_t, undo_node_t, purge_node_t: Add the field row_ext_t* ext.
56 lines
1.7 KiB
C
56 lines
1.7 KiB
C
/******************************************************
|
|
Caching of externally stored column prefixes
|
|
|
|
(c) 2006 Innobase Oy
|
|
|
|
Created September 2006 Marko Makela
|
|
*******************************************************/
|
|
|
|
#ifndef row0ext_h
|
|
#define row0ext_h
|
|
|
|
#include "univ.i"
|
|
#include "row0types.h"
|
|
#include "mem0mem.h"
|
|
|
|
/************************************************************************
|
|
Creates a cache of column prefixes of externally stored columns. */
|
|
UNIV_INLINE
|
|
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 */
|
|
ulint zip_size,/* compressed page size, or 0 */
|
|
mem_heap_t* heap); /* in: heap where created */
|
|
|
|
/************************************************************************
|
|
Looks up a column prefix of an externally stored column. */
|
|
UNIV_INLINE
|
|
byte*
|
|
row_ext_lookup(
|
|
/*===========*/
|
|
/* out: column prefix, or NULL if
|
|
the column is not stored externally */
|
|
row_ext_t* ext, /* in/out: column prefix cache */
|
|
ulint col, /* in: column number */
|
|
const byte* field, /* in: locally stored part of the column */
|
|
ulint f_len, /* in: length of field, in bytes */
|
|
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 */
|
|
ulint zip_size;/* compressed page size, or 0 */
|
|
char* 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
|