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Diffstat (limited to 'storage/innodb_plugin/include/row0ext.h')
-rw-r--r-- | storage/innodb_plugin/include/row0ext.h | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/storage/innodb_plugin/include/row0ext.h b/storage/innodb_plugin/include/row0ext.h new file mode 100644 index 00000000000..43d82d644e6 --- /dev/null +++ b/storage/innodb_plugin/include/row0ext.h @@ -0,0 +1,95 @@ +/***************************************************************************** + +Copyright (c) 2006, 2009, Innobase Oy. All Rights Reserved. + +This program is free software; you can redistribute it and/or modify it under +the terms of the GNU General Public License as published by the Free Software +Foundation; version 2 of the License. + +This program is distributed in the hope that it will be useful, but WITHOUT +ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS +FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. + +You should have received a copy of the GNU General Public License along with +this program; if not, write to the Free Software Foundation, Inc., 59 Temple +Place, Suite 330, Boston, MA 02111-1307 USA + +*****************************************************************************/ + +/**************************************************//** +@file include/row0ext.h +Caching of externally stored column prefixes + +Created September 2006 Marko Makela +*******************************************************/ + +#ifndef row0ext_h +#define row0ext_h + +#include "univ.i" +#include "row0types.h" +#include "data0types.h" +#include "mem0mem.h" + +/********************************************************************//** +Creates a cache of column prefixes of externally stored columns. +@return own: column prefix cache */ +UNIV_INTERN +row_ext_t* +row_ext_create( +/*===========*/ + ulint n_ext, /*!< in: number of externally stored columns */ + const ulint* ext, /*!< in: 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 */ + const dtuple_t* tuple, /*!< in: 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). */ + ulint zip_size,/*!< compressed page size in bytes, or 0 */ + mem_heap_t* heap); /*!< in: heap where created */ + +/********************************************************************//** +Looks up a column prefix of an externally stored column. +@return column prefix, or NULL if the column is not stored externally, +or pointer to field_ref_zero if the BLOB pointer is unset */ +UNIV_INLINE +const byte* +row_ext_lookup_ith( +/*===============*/ + const row_ext_t* ext, /*!< in/out: column prefix cache */ + ulint i, /*!< in: index of ext->ext[] */ + ulint* len); /*!< out: length of prefix, in bytes, + at most REC_MAX_INDEX_COL_LEN */ +/********************************************************************//** +Looks up a column prefix of an externally stored column. +@return column prefix, or NULL if the column is not stored externally, +or pointer to field_ref_zero if the BLOB pointer is unset */ +UNIV_INLINE +const byte* +row_ext_lookup( +/*===========*/ + const row_ext_t* ext, /*!< in: column prefix cache */ + ulint col, /*!< in: column number in the InnoDB + table object, as reported by + dict_col_get_no(); NOT relative to the + records in the clustered index */ + 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 */ + byte* 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 |