MDEV-14472 Assertion `is_current_stmt_binlog_format_row()' failed...bb-10.2-14472

in THD::binlog_write_table_map

Problem:- So the issue is when the test case (mdev_14472) is run with debug
  build , Assert DBUG_ASSERT(is_current_stmt_binlog_format_row()); is fired
  in binlog_write_table_map.

Analysis:- When we lock table t1, and if t1 has some trigger which updates
  another table then all other tables are also locked. So in the case of lock
  t1(in mdev_14472 test case) we will lock t1, t2, t3 and t4. In next insert
  command (t2 insert), we call handler->check_table_row_based from
  write_locked_table_maps which updates the table handler
  check_table_binlog_row_based_done to 1 and check_table_binlog_row_based_result
  to 1 , it is set to one because this particular insert stmt is unsafe(because
  of trigger on t4). The next insert stmt(insert t3) is safe so we will write
  that in stmt format , but since we havent cleared the previous
  check_table_binlog_row_based_result so it is logged in row format while
  thd->is_current_stmt_binlog_format_row() is still 0, and this fires the
  assert. So the question is why check_table_binlog_row_based_result is not
  reseted because mark_used_tables_as_free_for_reuse skips locked tables

Solution:- We make mark_used_tables_as_free_for_reuse to reset
  check_table_binlog_row_based_result even when table is locked

1 files changed, 6 insertions, 0 deletions

diff --git a/sql/sql_base.cc b/sql/sql_base.cc
index 9dfaf82758c..a93a1b3ef17 100644
--- a/sql/sql_base.cc
+++ b/sql/sql_base.cc
@@ -603,6 +603,12 @@ static void mark_used_tables_as_free_for_reuse(THD *thd, TABLE *table)
       table->query_id= 0;
       table->file->ha_reset();
     }
+    else
+    {
+      // table of exlict LOCK TABLE
+      table->file->check_table_binlog_row_based_done=
+      table->file->check_table_binlog_row_based_result= 0;
+    }
   }
 }