diff options
Diffstat (limited to 'sql/table.h')
| -rw-r--r-- | sql/table.h | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/sql/table.h b/sql/table.h index e873fb1de58..f3cfd75e022 100644 --- a/sql/table.h +++ b/sql/table.h @@ -499,6 +499,24 @@ struct st_table { my_bitmap_map *bitmap_init_value; MY_BITMAP def_read_set, def_write_set, tmp_set; /* containers */ MY_BITMAP *read_set, *write_set; /* Active column sets */ + /* + The ID of the query that opened and is using this table. Has different + meanings depending on the table type. + + Temporary tables: + + table->query_id is set to thd->query_id for the duration of a statement + and is reset to 0 once it is closed by the same statement. A non-zero + table->query_id means that a statement is using the table even if it's + not the current statement (table is in use by some outer statement). + + Non-temporary tables: + + Under pre-locked or LOCK TABLES mode: query_id is set to thd->query_id + for the duration of a statement and is reset to 0 once it is closed by + the same statement. A non-zero query_id is used to control which tables + in the list of pre-opened and locked tables are actually being used. + */ query_id_t query_id; /* @@ -593,8 +611,8 @@ struct st_table { my_bool locked_by_name; my_bool fulltext_searched; my_bool no_cache; - /* To signal that we should reset query_id for tables and cols */ - my_bool clear_query_id; + /* To signal that the table is associated with a HANDLER statement */ + my_bool open_by_handler; /* To indicate that a non-null value of the auto_increment field was provided by the user or retrieved from the current record. |