Bug#14397 - OPTIMIZE TABLE with an open HANDLER causes a crash

Version for 4.0.
It fixes two problems:
1. The cause of the bug was that we did not check the table version for
   the HANDLER ... READ commands. We did not notice when a table was
   replaced by a new one. This can happen during ALTER TABLE, REPAIR
   TABLE, and OPTIMIZE TABLE (there might be more cases). I call the fix
   for this problem "the primary bug fix".
2. mysql_ha_flush() was not always called with a locked LOCK_open.
   Though the function comment clearly said it must.
   I changed the code so that the locking is done when required. I call
   the fix for this problem "the secondary fix".


mysql-test/r/handler.result:
  Bug#14397 - OPTIMIZE TABLE with an open HANDLER causes a crash
  The test result.
mysql-test/t/handler.test:
  Bug#14397 - OPTIMIZE TABLE with an open HANDLER causes a crash
  The test case.
sql/mysql_priv.h:
  Bug#14397 - OPTIMIZE TABLE with an open HANDLER causes a crash
  Changed a definition for the secondary fix.
sql/sql_base.cc:
  Bug#14397 - OPTIMIZE TABLE with an open HANDLER causes a crash
  Changed function calls for the secondary fix.
sql/sql_class.cc:
  Bug#14397 - OPTIMIZE TABLE with an open HANDLER causes a crash
  Changed a function call for the secondary fix.
sql/sql_handler.cc:
  Bug#14397 - OPTIMIZE TABLE with an open HANDLER causes a crash
  The first two diffs make the primary bug fix.
  The rest is for the secondary fix.
sql/sql_table.cc:
  Bug#14397 - OPTIMIZE TABLE with an open HANDLER causes a crash
  Changed function calls for the secondary fix.

1 files changed, 29 insertions, 0 deletions

diff --git a/mysql-test/t/handler.test b/mysql-test/t/handler.test
index 53fe8c0a059..d91587b8070 100644
--- a/mysql-test/t/handler.test
+++ b/mysql-test/t/handler.test
@@ -339,3 +339,32 @@ drop table t2;
 drop table t3;
 drop table t4;
 drop table t5;
+
+#
+# Bug#14397 - OPTIMIZE TABLE with an open HANDLER causes a crash
+#
+create table t1 (c1 int);
+insert into t1 values (1);
+# client 1
+handler t1 open;
+handler t1 read first;
+# client 2
+connect (con2,localhost,root,,);
+connection con2;
+--exec echo send the below to another connection, do not wait for the result
+send optimize table t1;
+--sleep 1
+# client 1
+--exec echo proceed with the normal connection
+connection default;
+handler t1 read next;
+handler t1 close;
+# client 2
+--exec echo read the result from the other connection
+connection con2;
+reap;
+# client 1
+--exec echo proceed with the normal connection
+connection default;
+drop table t1;
+