MDEV-27159 Re-design the upper level of handling DML commandsbb-10.10-mdev-28883

This patch allows to execute only single-table and multi-table
UPDATE and DELETE statements using the method Sql_cmd_dml::execute().
The code that handles INSERT statements has not been touched.

1 files changed, 3 insertions, 2 deletions

diff --git a/sql/handler.h b/sql/handler.h
index 60c6195e68e..efc75d7281c 100644
--- a/sql/handler.h
+++ b/sql/handler.h
@@ -246,7 +246,7 @@ enum chf_create_flags {
   Example:
   UPDATE a=1 WHERE pk IN (<keys>)
 
-  mysql_update()
+  Sql_cmd_update::update_single_table()
   {
     if (<conditions for starting read removal>)
       start_read_removal()
@@ -1800,7 +1800,8 @@ struct THD_TRANS
     modified non-transactional tables of top-level statements. At
     the end of the previous statement and at the beginning of the session,
     it is reset to FALSE.  If such functions
-    as mysql_insert, mysql_update, mysql_delete etc modify a
+    as mysql_insert(), Sql_cmd_update::update_single_table,
+    Sql_cmd_delete::delete_single_table modify a
     non-transactional table, they set this flag to TRUE.  At the
     end of the statement, the value of stmt.modified_non_trans_table 
     is merged with all.modified_non_trans_table and gets reset.