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MDEV-30469 (refactoring) Support ORDER BY and LIMIT for multi-table DELETE...

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This patch includes a few changes to make the code easier to maintain:
  - Renamed SQL_I_List::link_in_list to SQL_I_List::insert.  link_in_list was
  ambiguous as it could refer to a link or it could refer to a node
  - Remove field_name local variable in multi_update::initialize_tables because
  it is not used when creating the temporary tables
  - multi_update changes:
    - Move temp table callocs to init, a more natural location for them, and moved
    tables_to_update to const member variable so we don't recompute it.
    - Filter out jtbm tables and tables not in the update map, pushing those that
    will be updated into an update_targets container.  This simplifies checks and
    loops in initialize_tables.
This commit is contained in:
Dave Gosselin
2024-12-03 09:48:17 -05:00
parent dfdbec1636
commit 02dc8615f2
12 changed files with 108 additions and 100 deletions
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4
sql/sql_class.h
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@ -7601,7 +7601,8 @@ class multi_update :public select_result_interceptor
{
TABLE_LIST *all_tables; /* query/update command tables */
List<TABLE_LIST> *leaves; /* list of leaves of join table tree */
List<TABLE_LIST> updated_leaves; /* list of of updated leaves */
List<TABLE_LIST> updated_leaves; /* a superset of tables which will be updated */
List<TABLE_LIST> update_targets; /* the tables that will be UPDATE'd */
TABLE_LIST *update_tables;
TABLE **tmp_tables, *main_table, *table_to_update;
TMP_TABLE_PARAM *tmp_table_param;
@ -7633,6 +7634,7 @@ class multi_update :public select_result_interceptor
ha_rows updated_sys_ver;
bool has_vers_fields;
const table_map tables_to_update;
public:
multi_update(THD *thd_arg, TABLE_LIST *ut, List<TABLE_LIST> *leaves_list,