A post-review fix for type-aware metadata locks.

DDL no longer aborts mysql_lock_tables(), and hence
we no longer need to support need_reopen flag of this
call. 
Remove the flag, and all the code in the server
that was responsible for handling the case when
it was set. This allowed to simplify: 
open_and_lock_tables_derived(), the delayed thread,
multi-update.

Rename MYSQL_LOCK_IGNORE_FLUSH to MYSQL_OPEN_IGNORE_FLUSH,
since we now only support this flag in open_table().

Rename MYSQL_LOCK_PERF_SCHEMA to MYSQL_LOCK_LOG_TABLE,
to avoid confusion.

Move the wait for the global read lock for cases
when we do updates in SELECT f1() or DO (UPDATE) to 
open_table() from mysql_lock_tables(). When waiting
for the read lock, we could raise need_reopen flag,
which is no longer present in mysql_lock_tables().
Since the block responsible for waiting for GRL
was moved, MYSQL_LOCK_IGNORE_GLOBAL_READ_LOCK
was renamed to MYSQL_OPEN_IGNORE_GLOBAL_READ_LOCK.


mysql-test/r/mdl_sync.result:
  Update test results (see comments for mdl_sync.test).
mysql-test/t/mdl_sync.test:
  Update tests: an abort mysql_lock_tables() called for an
  INSERT no longer auto-closes SQL HANDLERS, since it
  no longer leads to back-off and retry.
sql/ha_ndbcluster_binlog.cc:
  Remove unused variables.
sql/lock.cc:
  Remove support for need_reopen parameter of mysql_lock_tables().
  Update comments.
sql/log_event_old.cc:
  Remove the loop responsible for handling need_reopen
  out parameter of mysql_lock_tables().
sql/mysql_priv.h:
  Update open and lock tables flag names.
sql/share/errmsg-utf8.txt:
  Add a new error message to report when
  thr_multi_lock() is aborted.
sql/sql_base.cc:
  Update comments. Rename MYSQL_LOCK_IGNORE_FLUSH
  to MYSQL_OPEN_IGNORE_FLUSH.
sql/sql_class.h:
  Remove unused code.
sql/sql_db.cc:
  Remove an unused bit of code.
sql/sql_handler.cc:
  For backward compatibility, we still want to back off and
  retry when a call to mysql_lock_tables() is aborted
  from within an SQL HANDLER. Write an internal error
  handler to support the case.
sql/sql_insert.cc:
  Call mysql_lock_tables() no longer has need_reopen
  out parameter. Simplify the code by removing 
  the crud that took care of it.
  MYSQL_LOCK_IGNORE_FLUSH is now only supported by
  open_tables().
sql/sql_show.cc:
  Rename MYSQL_LOCK_IGNORE_FLUSH to MYSQL_OPEN_IGNORE_FLUSH
sql/sql_table.cc:
  Remove an unused parameter.
sql/sql_update.cc:
  Remove the need_reopen loop from multi-update.
  We no also longer need to cleanup the parse tree in case
  when mysql_lock_tables() is aborted and thus an infinite
  source of multi-update bugs is gone.
sql/tztime.cc:
  Rename MYSQL_LOCK_IGNORE_FLUSH to MYSQL_OPEN_IGNORE_FLUSH,
  since from now on this flag is only supported by open_table().

1 files changed, 6 insertions, 28 deletions

diff --git a/sql/sql_insert.cc b/sql/sql_insert.cc
index 26fb4e4e4e4..7423dd9d292 100644
--- a/sql/sql_insert.cc
+++ b/sql/sql_insert.cc
@@ -2396,7 +2396,8 @@ void kill_delayed_threads(void)
 bool Delayed_insert::open_and_lock_table()
 {
   if (!(table= open_n_lock_single_table(&thd, &table_list,
-                                        TL_WRITE_DELAYED, 0)))
+                                        TL_WRITE_DELAYED,
+                                        MYSQL_OPEN_IGNORE_GLOBAL_READ_LOCK)))
   {
     thd.fatal_error();				// Abort waiting inserts
     return TRUE;
@@ -2557,7 +2558,6 @@ pthread_handler_t handle_delayed_insert(void *arg)
 
       if (di->tables_in_use && ! thd->lock && !thd->killed)
       {
-        bool need_reopen;
         /*
           Request for new delayed insert.
           Lock the table, but avoid to be blocked by a global read lock.
@@ -2568,30 +2568,10 @@ pthread_handler_t handle_delayed_insert(void *arg)
           handler will close the table and finish when the outstanding
           inserts are done.
         */
-        if (! (thd->lock= mysql_lock_tables(thd, &di->table, 1,
-                                            MYSQL_LOCK_IGNORE_GLOBAL_READ_LOCK,
-                                            &need_reopen)))
+        if (! (thd->lock= mysql_lock_tables(thd, &di->table, 1, 0)))
         {
-          if (need_reopen && !thd->killed)
-          {
-            /*
-              We were waiting to obtain TL_WRITE_DELAYED (probably due to
-              someone having or requesting TL_WRITE_ALLOW_READ) and got
-              aborted. Try to reopen table and if it fails die.
-            */
-            TABLE_LIST *tl_ptr = &di->table_list;
-            close_tables_for_reopen(thd, &tl_ptr, NULL);
-            di->table= 0;
-            if (di->open_and_lock_table())
-            {
-              thd->killed= THD::KILL_CONNECTION;
-            }
-          }
-          else
-          {
-            /* Fatal error */
-            thd->killed= THD::KILL_CONNECTION;
-          }
+          /* Fatal error */
+          thd->killed= THD::KILL_CONNECTION;
         }
         mysql_cond_broadcast(&di->cond_client);
       }
@@ -3542,7 +3522,6 @@ static TABLE *create_table_from_items(THD *thd, HA_CREATE_INFO *create_info,
   List_iterator_fast<Item> it(*items);
   Item *item;
   Field *tmp_field;
-  bool not_used;
   DBUG_ENTER("create_table_from_items");
 
   tmp_table.alias= 0;
@@ -3666,8 +3645,7 @@ static TABLE *create_table_from_items(THD *thd, HA_CREATE_INFO *create_info,
     since it won't wait for the table lock (we have exclusive metadata lock on
     the table) and thus can't get aborted.
   */
-  if (! ((*lock)= mysql_lock_tables(thd, &table, 1,
-                                    MYSQL_LOCK_IGNORE_FLUSH, &not_used)) ||
+  if (! ((*lock)= mysql_lock_tables(thd, &table, 1, 0)) ||
         hooks->postlock(&table, 1))
   {
     if (*lock)