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96 lines
3.5 KiB
C
96 lines
3.5 KiB
C
/*****************************************************************************
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Copyright (c) 2006, 2009, Innobase Oy. All Rights Reserved.
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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Place, Suite 330, Boston, MA 02111-1307 USA
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*****************************************************************************/
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/**************************************************//**
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@file include/row0ext.h
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Caching of externally stored column prefixes
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Created September 2006 Marko Makela
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*******************************************************/
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#ifndef row0ext_h
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#define row0ext_h
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#include "univ.i"
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#include "row0types.h"
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#include "data0types.h"
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#include "mem0mem.h"
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/********************************************************************//**
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Creates a cache of column prefixes of externally stored columns.
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@return own: column prefix cache */
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UNIV_INTERN
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row_ext_t*
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row_ext_create(
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/*===========*/
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ulint n_ext, /*!< in: number of externally stored columns */
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const ulint* ext, /*!< in: col_no's of externally stored columns
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in the InnoDB table object, as reported by
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dict_col_get_no(); NOT relative to the records
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in the clustered index */
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const dtuple_t* tuple, /*!< in: data tuple containing the field
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references of the externally stored
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columns; must be indexed by col_no;
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the clustered index record must be
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covered by a lock or a page latch
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to prevent deletion (rollback or purge). */
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ulint zip_size,/*!< compressed page size in bytes, or 0 */
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mem_heap_t* heap); /*!< in: heap where created */
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/********************************************************************//**
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Looks up a column prefix of an externally stored column.
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@return column prefix, or NULL if the column is not stored externally,
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or pointer to field_ref_zero if the BLOB pointer is unset */
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UNIV_INLINE
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const byte*
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row_ext_lookup_ith(
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/*===============*/
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const row_ext_t* ext, /*!< in/out: column prefix cache */
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ulint i, /*!< in: index of ext->ext[] */
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ulint* len); /*!< out: length of prefix, in bytes,
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at most REC_MAX_INDEX_COL_LEN */
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/********************************************************************//**
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Looks up a column prefix of an externally stored column.
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@return column prefix, or NULL if the column is not stored externally,
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or pointer to field_ref_zero if the BLOB pointer is unset */
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UNIV_INLINE
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const byte*
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row_ext_lookup(
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/*===========*/
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const row_ext_t* ext, /*!< in: column prefix cache */
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ulint col, /*!< in: column number in the InnoDB
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table object, as reported by
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dict_col_get_no(); NOT relative to the
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records in the clustered index */
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ulint* len); /*!< out: length of prefix, in bytes,
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at most REC_MAX_INDEX_COL_LEN */
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/** Prefixes of externally stored columns */
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struct row_ext_struct{
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ulint n_ext; /*!< number of externally stored columns */
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const ulint* ext; /*!< col_no's of externally stored columns */
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byte* buf; /*!< backing store of the column prefix cache */
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ulint len[1]; /*!< prefix lengths; 0 if not cached */
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};
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#ifndef UNIV_NONINL
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#include "row0ext.ic"
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#endif
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#endif
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