Backport of revno: 3514

Bug#40181 Made use of tdc_remove_table instead of just 
setting share->version to 0 to make sure all unused table
instances go away as part of CREATE/ALTER TABLE.

mysql-test/r/partition.result

@@ -65,6 +65,15 @@ show indexes from t1;
 Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment
 t1	1	a	1	a	A	1	NULL	NULL	YES	BTREE	
 drop table t1;
+create table t1 (a int)
+partition by hash (a);
+create index i on t1 (a);
+insert into t1 values (1);
+insert into t1 select * from t1;
+create index i on t1 (a);
+ERROR 42000: Duplicate key name 'i'
+create index i2 on t1 (a);
+drop table t1;
 CREATE TABLE t1 (a INT, FOREIGN KEY (a) REFERENCES t0 (a))
 ENGINE=MyISAM
 PARTITION BY HASH (a);

mysql-test/t/partition.test

@@ -74,6 +74,19 @@ analyze table t1;
 show indexes from t1;
 drop table t1;
 
+#
+# Bug#40181: hang if create index
+#
+create table t1 (a int)
+partition by hash (a);
+create index i on t1 (a);
+insert into t1 values (1);
+insert into t1 select * from t1;
+--error ER_DUP_KEYNAME
+create index i on t1 (a);
+create index i2 on t1 (a);
+drop table t1;
+
 #
 # Bug#36001: Partitions: spelling and using some error messages
 #

sql/sql_partition.cc

@@ -4189,7 +4189,9 @@ bool mysql_unpack_partition(THD *thd,
     */
     thd->free_items();
     part_info= thd->work_part_info;
-    table->s->version= 0UL;
+    tdc_remove_table(thd, TDC_RT_REMOVE_UNUSED,
+                     table->s->db.str,
+                     table->s->table_name.str);
     *work_part_info_used= true;
   }
   table->part_info= part_info;
@@ -4482,12 +4484,17 @@ uint prep_alter_part_table(THD *thd, TABLE *table, Alter_info *alter_info,
 
   /*
     We are going to manipulate the partition info on the table object
-    so we need to ensure that the data structure of the table object
-    is freed by setting version to 0. table->s->version= 0 forces a
-    flush of the table object in close_thread_tables().
+    so we need to ensure that the table instances cached and all other
+    instances are properly closed.
   */
   if (table->part_info)
-    table->s->version= 0L;
+  {
+    pthread_mutex_lock(&LOCK_open);
+    tdc_remove_table(thd, TDC_RT_REMOVE_UNUSED,
+                     table->s->db.str,
+                     table->s->table_name.str);
+    pthread_mutex_unlock(&LOCK_open);
+  }
 
   thd->work_part_info= thd->lex->part_info;
   if (thd->work_part_info &&
@@ -6242,7 +6249,9 @@ static int alter_close_tables(ALTER_PARTITION_PARAM_TYPE *lpt)
         alter_partition_lock_handling() and the table is closed
         by close_thread_tables() instead.
       */
-      table->s->version= 0;
+      tdc_remove_table(thd, TDC_RT_REMOVE_UNUSED,
+                       table->s->db.str,
+                       table->s->table_name.str);
     }
   }
   pthread_mutex_unlock(&LOCK_open);