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, 2 insertions, 2 deletions

diff --git a/sql/sql_show.cc b/sql/sql_show.cc
index 8b8e223ad02..542a0378bf4 100644
--- a/sql/sql_show.cc
+++ b/sql/sql_show.cc
@@ -2934,7 +2934,7 @@ fill_schema_show_cols_or_idxs(THD *thd, TABLE_LIST *tables,
   */
   lex->sql_command= SQLCOM_SHOW_FIELDS;
   res= open_normal_and_derived_tables(thd, show_table_list,
-                                      (MYSQL_LOCK_IGNORE_FLUSH |
+                                      (MYSQL_OPEN_IGNORE_FLUSH |
                                        MYSQL_OPEN_FORCE_SHARED_HIGH_PRIO_MDL |
                                        (can_deadlock ?
                                         MYSQL_OPEN_FAIL_ON_MDL_CONFLICT : 0)));
@@ -3516,7 +3516,7 @@ int get_all_tables(THD *thd, TABLE_LIST *tables, COND *cond)
             show_table_list->i_s_requested_object=
               schema_table->i_s_requested_object;
             res= open_normal_and_derived_tables(thd, show_table_list,
-                   (MYSQL_LOCK_IGNORE_FLUSH |
+                   (MYSQL_OPEN_IGNORE_FLUSH |
                     MYSQL_OPEN_FORCE_SHARED_HIGH_PRIO_MDL |
                     (can_deadlock ? MYSQL_OPEN_FAIL_ON_MDL_CONFLICT : 0)));
             lex->sql_command= save_sql_command;