MDEV 13679 Enabled sequences to be used in DEFAULT

Other changes done to get this to work:
- Added 'internal_tables' to TABLE object to list which sequence tables
  is needed to use the table.
- Mark any expression using DEFAULT() with LEX->default_used.
  This is needed when deciding if we should open internal sequence
  tables when a table is opened (we don't need to open sequence tables
  if the main table is only used with SELECT).
- Create_and_open_temporary_table() can now also open all internal
  sequence tables.
- Added option MYSQL_LOCK_USE_MALLOC to mysql_lock_tables()
  to force memory allocation to be used with malloc instead of
  memroot.
- Added flag to MYSQL_LOCK to remember if allocation was done with
  malloc or memroot (makes code simpler and safer).
- init_one_table_for_prelocking() now takes argument for what lock to
  use instead of it's a routine or something else.
- Renamed prelocking placeholders to make them more understandable as
  they are now used in more code.
- Changed test in check_lock_and_start_stmt() if found table has correct
  locks. The old test didn't work for tables that has lock
  TL_WRITE_ALLOW_WRITE, which is what sequence tables are using.
- Added VCOL_NOT_VIRTUAL option to ensure that sequence functions can't
  be used with virtual columns
- More sequence tests

1 files changed, 2 insertions, 1 deletions

diff --git a/sql/sp_head.cc b/sql/sp_head.cc
index a0f0fb271ef..bcdef10506f 100644
--- a/sql/sp_head.cc
+++ b/sql/sp_head.cc
@@ -4654,7 +4654,8 @@ sp_head::add_used_tables_to_table_list(THD *thd,
       table->init_one_table_for_prelocking(key_buff, stab->db_length,
            key_buff + stab->db_length + 1, stab->table_name_length,
            key_buff + stab->db_length + stab->table_name_length + 2,
-           stab->lock_type, true, belong_to_view, stab->trg_event_map,
+           stab->lock_type, TABLE_LIST::PRELOCK_ROUTINE, belong_to_view,
+           stab->trg_event_map,
            query_tables_last_ptr);
 
       tab_buff+= ALIGN_SIZE(sizeof(TABLE_LIST));