diff options
Diffstat (limited to 'sql/table.h')
-rw-r--r-- | sql/table.h | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/sql/table.h b/sql/table.h index 1b8919f4e59..183ade8f1d9 100644 --- a/sql/table.h +++ b/sql/table.h @@ -2116,6 +2116,29 @@ struct vers_select_conds_t struct LEX; class Index_hint; + +/* + @struct TABLE_CHAIN + @brief Subchain of global chain of table references + + The structure contains a pointer to the address of the next_global + pointer to the first TABLE_LIST objectof the subchain and the address + of the next_global pointer to the element right after the last + TABLE_LIST object of the subchain. For an empty subchain both pointers + have the same value. +*/ + +struct TABLE_CHAIN +{ + TABLE_CHAIN() {} + + TABLE_LIST **start_pos; + TABLE_LIST ** end_pos; + + void set_start_pos(TABLE_LIST **pos) { start_pos= pos; } + void set_end_pos(TABLE_LIST **pos) { end_pos= pos; } +}; + struct TABLE_LIST { TABLE_LIST() {} /* Remove gcc warning */ @@ -2451,6 +2474,20 @@ struct TABLE_LIST /* call back function for asking handler about caching in query cache */ qc_engine_callback callback_func; thr_lock_type lock_type; + + /* + Two fields below are set during parsing this table reference in the cases + when the table reference can be potentially a reference to a CTE table. + In this cases the fact that the reference is a reference to a CTE or not + will be ascertained at the very end of parsing of the query when referencies + to CTE are resolved. For references to CTE and to derived tables no mdl + requests are needed while for other table references they are. If a request + is possibly postponed the info that allows to issue this request must be + saved in 'mdl_type' and 'table_options'. + */ + enum_mdl_type mdl_type; + ulong table_options; + uint outer_join; /* Which join type */ uint shared; /* Used in multi-upd */ bool updatable; /* VIEW/TABLE can be updated now */ |