Fixed bug in federatedx patch that caused partition tests to fail.

Fixed that connection string is returned for partitioned federated tables.

mysql-test/r/partition_federated.result:
  Fixed error message
mysql-test/suite/federated/federated_partition.result:
  Added test to show that connection string is returned in 'show create'.
sql/ha_partition.cc:
  Fixed a set of bugs introduced by the last federated patch:
  - We can't allocate m_ordered_rec_buffer in memroot as it has to survive call to clear_handler_file()
sql/partition_element.h:
  Ensure that connect_string is properly initialized.
  (This caused crashed in partition tests)
sql/sql_partition.cc:
  Print CONNECTION option for federated partitioned tables

mysql-test/r/partition_federated.result

@@ -2,5 +2,5 @@ drop table if exists t1;
 create table t1 (s1 int) engine=federated
 connection='mysql://root@localhost/federated/t1' partition by list (s1)
 (partition p1 values in (1), partition p2 values in (2));
-ERROR HY000: Engine cannot be used in partitioned tables
+ERROR HY000: Unable to connect to foreign data source: CONNECTION not valid for partition
 End of 5.1 tests

mysql-test/suite/federated/federated_partition.result

@@ -9,6 +9,15 @@ partition by list (s1)
 connection='mysql://root@127.0.0.1:SLAVE_PORT/federated/t1_1',
 partition p2 values in (2,4)
 connection='mysql://root@127.0.0.1:SLAVE_PORT/federated/t1_2');
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `s1` int(11) NOT NULL,
+  PRIMARY KEY (`s1`)
+) ENGINE=FEDERATED DEFAULT CHARSET=latin1
+/*!50100 PARTITION BY LIST (s1)
+(PARTITION p1 VALUES IN (1,3) CONNECTION = 'mysql://root@127.0.0.1:SLAVE_PORT/federated/t1_1' ENGINE = FEDERATED,
+ PARTITION p2 VALUES IN (2,4) CONNECTION = 'mysql://root@127.0.0.1:SLAVE_PORT/federated/t1_2' ENGINE = FEDERATED) */
 insert into t1 values (1), (2), (3), (4);
 select * from t1;
 s1

mysql-test/suite/federated/federated_partition.test

@@ -30,6 +30,9 @@ eval create table t1 (s1 int primary key) engine=federated
    partition p2 values in (2,4)
      connection='mysql://root@127.0.0.1:$SLAVE_MYPORT/federated/t1_2');
 
+--replace_result $SLAVE_MYPORT SLAVE_PORT
+show create table t1;
+
 insert into t1 values (1), (2), (3), (4);
 select * from t1;
 

sql/ha_partition.cc

@@ -289,6 +289,7 @@ ha_partition::~ha_partition()
     for (i= 0; i < m_tot_parts; i++)
       delete m_file[i];
   }
+  my_free(m_ordered_rec_buffer, MYF(MY_ALLOW_ZERO_PTR));
 
   clear_handler_file();
 
@@ -2234,9 +2235,10 @@ bool ha_partition::create_handler_file(const char *name)
       part_elem= part_it++;
       uint length = part_elem->connect_string.length;
       int4store(buffer, length);
-      my_write(file, buffer, 4, MYF(MY_WME | MY_NABP));
-      my_write(file, (uchar *) part_elem->connect_string.str, length,
-               MYF(MY_WME | MY_NABP));
+      if (my_write(file, buffer, 4, MYF(MY_WME | MY_NABP)) ||
+          my_write(file, (uchar *) part_elem->connect_string.str, length,
+                   MYF(MY_WME | MY_NABP)))
+        result= TRUE;
     }
     VOID(my_close(file, MYF(0)));
   }
@@ -2264,7 +2266,6 @@ void ha_partition::clear_handler_file()
   m_file_buffer= NULL;
   m_engine_array= NULL;
   m_connect_string= NULL;
-  m_ordered_rec_buffer= NULL;
 }
 
 /*
@@ -2568,7 +2569,8 @@ int ha_partition::open(const char *name, int mode, uint test_if_locked)
   alloc_len+= table_share->max_key_length;
   if (!m_ordered_rec_buffer)
   {
-    if (!(m_ordered_rec_buffer= (uchar*) alloc_root(&m_mem_root, alloc_len)))
+    if (!(m_ordered_rec_buffer= (uchar*) (uchar*)my_malloc(alloc_len,
+                                                           MYF(MY_WME))))
     {
       DBUG_RETURN(1);
     }

sql/partition_element.h

@@ -81,6 +81,8 @@ public:
     nodegroup_id(UNDEF_NODEGROUP), has_null_value(FALSE),
     signed_flag(FALSE), max_value(FALSE)
   {
+    connect_string.str= 0;
+    connect_string.length= 0;
   }
   partition_element(partition_element *part_elem)
   : part_max_rows(part_elem->part_max_rows),
@@ -95,6 +97,8 @@ public:
     nodegroup_id(part_elem->nodegroup_id),
     has_null_value(FALSE)
   {
+    connect_string.str= 0;
+    connect_string.length= 0;
   }
   ~partition_element() {}
 };

sql/sql_partition.cc

@@ -1982,6 +1982,9 @@ static int add_partition_options(File fptr, partition_element *p_elem)
   }
   if (p_elem->part_comment)
     err+= add_keyword_string(fptr, "COMMENT", TRUE, p_elem->part_comment);
+  if (p_elem->connect_string.length)
+    err+= add_keyword_string(fptr, "CONNECTION", TRUE,
+                             p_elem->connect_string.str);
   return err + add_engine(fptr,p_elem->engine_type);
 }