diff options
Diffstat (limited to 'sql/item_subselect.cc')
| -rw-r--r-- | sql/item_subselect.cc | 112 |
1 files changed, 58 insertions, 54 deletions
diff --git a/sql/item_subselect.cc b/sql/item_subselect.cc index 843c6ced263..760c991198a 100644 --- a/sql/item_subselect.cc +++ b/sql/item_subselect.cc @@ -13,12 +13,15 @@ along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ -/* - subselect Item +/** + @file + + @brief + subselect Item -SUBSELECT TODO: - - add function from mysql_select that use JOIN* as parameter to JOIN methods - (sql_select.h/sql_select.cc) + @todo + - add function from mysql_select that use JOIN* as parameter to JOIN + methods (sql_select.h/sql_select.cc) */ #ifdef USE_PRAGMA_IMPLEMENTATION @@ -403,6 +406,16 @@ void Item_singlerow_subselect::reset() } +/** + @todo + - We cant change name of Item_field or Item_ref, because it will + prevent it's correct resolving, but we should save name of + removed item => we do not make optimization if top item of + list is field or reference. + - switch off this optimization for prepare statement, + because we do not rollback this changes. + Make rollback for it, or special name resolving mode in 5.0. +*/ Item_subselect::trans_res Item_singlerow_subselect::select_transformer(JOIN *join) { @@ -1445,24 +1458,24 @@ Item_in_subselect::select_transformer(JOIN *join) } -/* +/** Prepare IN/ALL/ANY/SOME subquery transformation and call appropriate - transformation function + transformation function. - SYNOPSIS - Item_in_subselect::select_in_like_transformer() - join JOIN object of transforming subquery - func creator of condition function of subquery - - DESCRIPTION To decide which transformation procedure (scalar or row) applicable here we have to call fix_fields() for left expression to be able to call cols() method on it. Also this method make arena management for underlying transformation methods. - RETURN + @param join JOIN object of transforming subquery + @param func creator of condition function of subquery + + @retval RES_OK OK - RES_REDUCE OK, and current subquery was reduced during transformation + @retval + RES_REDUCE OK, and current subquery was reduced during + transformation + @retval RES_ERROR Error */ @@ -2412,16 +2425,15 @@ void subselect_indexsubquery_engine::print(String *str) str->append(')'); } -/* - change select_result object of engine +/** + change select_result object of engine. - SYNOPSIS - subselect_single_select_engine::change_result() - si new subselect Item - res new select_result object + @param si new subselect Item + @param res new select_result object - RETURN + @retval FALSE OK + @retval TRUE error */ @@ -2434,16 +2446,15 @@ bool subselect_single_select_engine::change_result(Item_subselect *si, } -/* - change select_result object of engine +/** + change select_result object of engine. - SYNOPSIS - subselect_single_select_engine::change_result() - si new subselect Item - res new select_result object + @param si new subselect Item + @param res new select_result object - RETURN + @retval FALSE OK + @retval TRUE error */ @@ -2457,16 +2468,15 @@ bool subselect_union_engine::change_result(Item_subselect *si, } -/* - change select_result emulation, never should be called +/** + change select_result emulation, never should be called. - SYNOPSIS - subselect_single_select_engine::change_result() - si new subselect Item - res new select_result object + @param si new subselect Item + @param res new select_result object - RETURN + @retval FALSE OK + @retval TRUE error */ @@ -2478,14 +2488,12 @@ bool subselect_uniquesubquery_engine::change_result(Item_subselect *si, } -/* - Report about presence of tables in subquery - - SYNOPSIS - subselect_single_select_engine::no_tables() +/** + Report about presence of tables in subquery. - RETURN + @retval TRUE there are not tables used in subquery + @retval FALSE there are some tables in subquery */ bool subselect_single_select_engine::no_tables() @@ -2510,14 +2518,12 @@ bool subselect_single_select_engine::may_be_null() } -/* - Report about presence of tables in subquery +/** + Report about presence of tables in subquery. - SYNOPSIS - subselect_union_engine::no_tables() - - RETURN + @retval TRUE there are not tables used in subquery + @retval FALSE there are some tables in subquery */ bool subselect_union_engine::no_tables() @@ -2531,14 +2537,12 @@ bool subselect_union_engine::no_tables() } -/* - Report about presence of tables in subquery +/** + Report about presence of tables in subquery. - SYNOPSIS - subselect_uniquesubquery_engine::no_tables() - - RETURN + @retval TRUE there are not tables used in subquery + @retval FALSE there are some tables in subquery */ |