diff options
Diffstat (limited to 'storage/innobase/include/data0data.h')
| -rw-r--r-- | storage/innobase/include/data0data.h | 32 |
1 files changed, 30 insertions, 2 deletions
diff --git a/storage/innobase/include/data0data.h b/storage/innobase/include/data0data.h index d3361ad8b3b..a120cd358ab 100644 --- a/storage/innobase/include/data0data.h +++ b/storage/innobase/include/data0data.h @@ -1,7 +1,7 @@ /***************************************************************************** Copyright (c) 1994, 2016, Oracle and/or its affiliates. All Rights Reserved. -Copyright (c) 2017, MariaDB Corporation. +Copyright (c) 2017, 2018, 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 @@ -638,12 +638,40 @@ struct dtuple_t { /** Trim the tail of an index tuple before insert or update. After instant ADD COLUMN, if the last fields of a clustered index tuple - match the 'default row', there will be no need to store them. + match the default values that were explicitly specified or implied + during ADD COLUMN, there will be no need to store them. NOTE: A page latch in the index must be held, so that the index may not lose 'instantness' before the trimmed tuple has been inserted or updated. @param[in] index index possibly with instantly added columns */ void trim(const dict_index_t& index); + + /** + @param info_bits the info_bits of a data tuple + @return whether this is a hidden metadata record + for instant ADD COLUMN or ALTER TABLE */ + static bool is_alter_metadata(ulint info_bits) + { + return UNIV_UNLIKELY(info_bits == REC_INFO_METADATA_ALTER); + } + + /** + @param info_bits the info_bits of a data tuple + @return whether this is a hidden metadata record + for instant ADD COLUMN or ALTER TABLE */ + static bool is_metadata(ulint info_bits) + { + return UNIV_UNLIKELY((info_bits & ~REC_INFO_DELETED_FLAG) + == REC_INFO_METADATA_ADD); + } + + /** @return whether this is a hidden metadata record + for instant ALTER TABLE (not only ADD COLUMN) */ + bool is_alter_metadata() const { return is_alter_metadata(info_bits); } + + /** @return whether this is a hidden metadata record + for instant ADD COLUMN or ALTER TABLE */ + bool is_metadata() const { return is_metadata(info_bits); } }; /** A slot for a field in a big rec vector */ |