MDEV-26712 row events never reset thd->mem_rootbb-10.3-MDEV-26712-andrei

but must do that at the end of the statement.
A provide template patch is elaborated also to match
to the upstream fixes of the very same bug.

1 files changed, 12 insertions, 8 deletions

diff --git a/sql/log_event.cc b/sql/log_event.cc
index c82a721708b..64f212b9f69 100644
--- a/sql/log_event.cc
+++ b/sql/log_event.cc
@@ -11722,14 +11722,18 @@ int Rows_log_event::do_apply_event(rpl_group_info *rgi)
     }
 #endif /* WITH_WSREP && HAVE_QUERY_CACHE */
 
-    if (unlikely(get_flags(STMT_END_F) &&
-                 (error= rows_event_stmt_cleanup(rgi, thd))))
-    slave_rows_error_report(ERROR_LEVEL,
-                            thd->is_error() ? 0 : error,
-                            rgi, thd, table,
-                            get_type_str(),
-                            RPL_LOG_NAME, log_pos);
-  DBUG_RETURN(error);
+    if (unlikely(get_flags(STMT_END_F)))
+    {
+      if ((error= rows_event_stmt_cleanup(rgi, thd)))
+        slave_rows_error_report(ERROR_LEVEL,
+                                thd->is_error() ? 0 : error,
+                                rgi, thd, table,
+                                get_type_str(),
+                                RPL_LOG_NAME, log_pos);
+      if (thd->slave_thread)
+        free_root(thd->mem_root, MYF(MY_KEEP_PREALLOC));
+    }
+    DBUG_RETURN(error);
 
 err:
   restore_empty_query_table_list(thd->lex);