diff options
Diffstat (limited to 'storage/innobase/include/row0ext.h')
| -rw-r--r-- | storage/innobase/include/row0ext.h | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/storage/innobase/include/row0ext.h b/storage/innobase/include/row0ext.h new file mode 100644 index 00000000..78886332 --- /dev/null +++ b/storage/innobase/include/row0ext.h @@ -0,0 +1,101 @@ +/***************************************************************************** + +Copyright (c) 2006, 2016, Oracle and/or its affiliates. All Rights Reserved. +Copyright (c) 2019, MariaDB Corporation. + +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., +51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA + +*****************************************************************************/ + +/**************************************************//** +@file include/row0ext.h +Caching of externally stored column prefixes + +Created September 2006 Marko Makela +*******************************************************/ + +#ifndef row0ext_h +#define row0ext_h + +#include "data0types.h" +#include "mem0mem.h" +#include "dict0types.h" +#include "fsp0types.h" +#include "row0types.h" + +/********************************************************************//** +Creates a cache of column prefixes of externally stored columns. +@return own: column prefix cache */ +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 dict_table_t& table, /*!< in: table */ + 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). */ + 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 the length determined by + DICT_MAX_FIELD_LEN_BY_FORMAT() */ +/********************************************************************//** +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 the length determined by + DICT_MAX_FIELD_LEN_BY_FORMAT() */ + +/** Prefixes of externally stored columns */ +struct row_ext_t{ + 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 max_len;/*!< maximum prefix length, it could be + REC_ANTELOPE_MAX_INDEX_COL_LEN or + REC_VERSION_56_MAX_INDEX_COL_LEN depending + on row format */ + ulint zip_size;/*!< ROW_FORMAT=COMPRESSED page size, or 0 */ + ulint len[1]; /*!< prefix lengths; 0 if not cached */ +}; + +#include "row0ext.inl" + +#endif |