diff options
Diffstat (limited to 'storage/innobase/include/data0data.h')
| -rw-r--r-- | storage/innobase/include/data0data.h | 32 |
1 files changed, 31 insertions, 1 deletions
diff --git a/storage/innobase/include/data0data.h b/storage/innobase/include/data0data.h index db321626368..fbbdd3b8f2d 100644 --- a/storage/innobase/include/data0data.h +++ b/storage/innobase/include/data0data.h @@ -491,6 +491,22 @@ struct dfield_t{ @param[in,out] heap memory heap in which the clone will be created @return the cloned object */ dfield_t* clone(mem_heap_t* heap) const; + + /** @return system field indicates history row */ + bool vers_history_row() const + { + ut_ad(type.vers_sys_end()); + if (type.mtype == DATA_FIXBINARY) { + ut_ad(len == sizeof timestamp_max_bytes); + return 0 != memcmp(data, timestamp_max_bytes, len); + } else { + ut_ad(type.mtype == DATA_INT); + ut_ad(len == sizeof trx_id_max_bytes); + return 0 != memcmp(data, trx_id_max_bytes, len); + } + ut_ad(0); + return false; + } }; /** Structure for an SQL data tuple of fields (logical record) */ @@ -519,6 +535,16 @@ struct dtuple_t { /** Value of dtuple_t::magic_n */ # define DATA_TUPLE_MAGIC_N 65478679 #endif /* UNIV_DEBUG */ + + /** 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 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); }; inline ulint dtuple_get_n_fields(const dtuple_t* tuple) @@ -536,7 +562,11 @@ inline const void* dfield_get_data(const dfield_t* field) ut_ad(field->len == UNIV_SQL_NULL || field->data != &data_error); return field->data; } -inline ulint dfield_get_len(const dfield_t* field) { return field->len; } +inline ulint dfield_get_len(const dfield_t* field) { + ut_ad(field->len == UNIV_SQL_NULL || field->data != &data_error); + ut_ad(field->len != UNIV_SQL_DEFAULT); + return field->len; +} inline bool dfield_is_null(const dfield_t* field) { return field->len == UNIV_SQL_NULL; } /** @return whether a column is to be stored off-page */ |