Bug #16782: Partitions: crash, REPLACE .. on table with PK, DUPLICATE

KEY event. Partitioning wrongly claimed to be able to handle HA_DUPP_POS
when it was supported by the underlying storage engine, which resulted
in a crash when handling REPLACE statements.

mysql-test/r/partition.result

@@ -278,3 +278,9 @@ partition p1 values in (14)
 insert into t1 values (10,1);
 ERROR HY000: Table has no partition for value 11
 drop table t1;
+create table t1 (f_int1 integer, f_int2 integer, primary key (f_int1))
+partition by hash(f_int1) partitions 2;
+insert into t1 values (1,1),(2,2);
+replace into t1 values (1,1),(2,2);
+drop table t1;
+End of 5.1 tests

mysql-test/t/partition.test

@@ -353,3 +353,13 @@ insert into t1 values (10,1);
 
 drop table t1;
 
+#
+# Bug #16782: Crash using REPLACE on table with primary key
+#
+create table t1 (f_int1 integer, f_int2 integer, primary key (f_int1))
+  partition by hash(f_int1) partitions 2;
+insert into t1 values (1,1),(2,2);
+replace into t1 values (1,1),(2,2);
+drop table t1;
+
+--echo End of 5.1 tests

sql/ha_partition.cc

@@ -359,7 +359,7 @@ int ha_partition::ha_initialise()
     other parameters are calculated on demand.
     HA_FILE_BASED is always set for partition handler since we use a
     special file for handling names of partitions, engine types.
-    HA_CAN_GEOMETRY, HA_CAN_FULLTEXT, HA_CAN_SQL_HANDLER,
+    HA_CAN_GEOMETRY, HA_CAN_FULLTEXT, HA_CAN_SQL_HANDLER, HA_DUPP_POS,
     HA_CAN_INSERT_DELAYED is disabled until further investigated.
   */
   m_table_flags= m_file[0]->table_flags();
@@ -382,8 +382,8 @@ int ha_partition::ha_initialise()
       m_pkey_is_clustered= FALSE;
     m_table_flags&= file->table_flags();
   } while (*(++file_array));
-  m_table_flags&= ~(HA_CAN_GEOMETRY & HA_CAN_FULLTEXT &
-                    HA_CAN_SQL_HANDLER & HA_CAN_INSERT_DELAYED);
+  m_table_flags&= ~(HA_CAN_GEOMETRY | HA_CAN_FULLTEXT | HA_DUPP_POS |
+                    HA_CAN_SQL_HANDLER | HA_CAN_INSERT_DELAYED);
   m_table_flags|= HA_FILE_BASED | HA_REC_NOT_IN_SEQ;
   DBUG_RETURN(0);
 }
@@ -4688,6 +4688,7 @@ int ha_partition::extra(enum ha_extra_function operation)
   case HA_EXTRA_PREPARE_FOR_UPDATE:
   case HA_EXTRA_PREPARE_FOR_DELETE:
   case HA_EXTRA_FORCE_REOPEN:
+  case HA_EXTRA_FLUSH_CACHE:
   {
     if (m_myisam)
       DBUG_RETURN(loop_extra(operation));