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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 18:07:14 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 18:07:14 +0000 |
commit | a175314c3e5827eb193872241446f2f8f5c9d33c (patch) | |
tree | cd3d60ca99ae00829c52a6ca79150a5b6e62528b /sql/records.h | |
parent | Initial commit. (diff) | |
download | mariadb-10.5-upstream/1%10.5.12.tar.xz mariadb-10.5-upstream/1%10.5.12.zip |
Adding upstream version 1:10.5.12.upstream/1%10.5.12upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | sql/records.h | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/sql/records.h b/sql/records.h new file mode 100644 index 00000000..272bbd0d --- /dev/null +++ b/sql/records.h @@ -0,0 +1,103 @@ +#ifndef SQL_RECORDS_H +#define SQL_RECORDS_H +/* Copyright (c) 2008, 2010, Oracle and/or its affiliates. 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */ + +#ifdef USE_PRAGMA_INTERFACE +#pragma interface /* gcc class implementation */ +#endif + +#include "table.h" + +struct st_join_table; +class handler; +class THD; +class SQL_SELECT; +class Copy_field; +class SORT_INFO; + +struct READ_RECORD; + +void end_read_record(READ_RECORD *info); +void free_cache(READ_RECORD *info); + +/** + A context for reading through a single table using a chosen access method: + index read, scan, etc, use of cache, etc. + + Use by: + READ_RECORD read_record; + init_read_record(&read_record, ...); + while (read_record.read_record()) + { + ... + } + end_read_record(); +*/ + +struct READ_RECORD +{ + typedef int (*Read_func)(READ_RECORD*); + typedef void (*Unlock_row_func)(st_join_table *); + typedef int (*Setup_func)(struct st_join_table*); + + TABLE *table; /* Head-form */ + Unlock_row_func unlock_row; + Read_func read_record_func; + THD *thd; + SQL_SELECT *select; + uint ref_length, reclength, rec_cache_size, error_offset; + + /** + Counting records when reading result from filesort(). + Used when filesort leaves the result in the filesort buffer. + */ + ha_rows unpack_counter; + + uchar *ref_pos; /* pointer to form->refpos */ + uchar *rec_buf; /* to read field values after filesort */ + uchar *cache,*cache_pos,*cache_end,*read_positions; + + /* + Structure storing information about sorting + */ + SORT_INFO *sort_info; + struct st_io_cache *io_cache; + bool print_error; + + int read_record() { return read_record_func(this); } + uchar *record() const { return table->record[0]; } + + /* + SJ-Materialization runtime may need to read fields from the materialized + table and unpack them into original table fields: + */ + Copy_field *copy_field; + Copy_field *copy_field_end; +public: + READ_RECORD() : table(NULL), cache(NULL) {} + ~READ_RECORD() { end_read_record(this); } +}; + +bool init_read_record(READ_RECORD *info, THD *thd, TABLE *reg_form, + SQL_SELECT *select, SORT_INFO *sort, + int use_record_cache, + bool print_errors, bool disable_rr_cache); +bool init_read_record_idx(READ_RECORD *info, THD *thd, TABLE *table, + bool print_error, uint idx, bool reverse); + +void rr_unlock_row(st_join_table *tab); + +#endif /* SQL_RECORDS_H */ |