BUG#4315

BUG#4535
BUG#4686


mysql-test/r/func_gconcat.result:
  add testes of blobs and null values
mysql-test/t/func_gconcat.test:
  add testes of blobs and null values
sql/item_sum.cc:
  replace code with maybe_null and change store mode of fields

mysql-test/r/func_gconcat.result

@@ -321,3 +321,33 @@ HAVING LEFT(names, 1) ='J';
 names
 John###Anna###Bill
 DROP TABLE t1;
+CREATE TABLE t1 ( a int, b TEXT );
+INSERT INTO t1 VALUES (1,'First Row'), (2,'Second Row');
+SELECT GROUP_CONCAT(b ORDER BY b) FROM t1 GROUP BY a;
+GROUP_CONCAT(b ORDER BY b)
+First Row
+Second Row
+DROP TABLE t1;
+CREATE TABLE t1 (a_id tinyint(4) NOT NULL default '0', PRIMARY KEY  (a_id)) ENGINE=InnoDB DEFAULT CHARSET=latin1;
+INSERT INTO t1 VALUES (1),(2),(3);
+CREATE TABLE t2 (b_id tinyint(4) NOT NULL default '0',b_a tinyint(4) NOT NULL default '0', PRIMARY KEY  (b_id), KEY  (b_a), 
+CONSTRAINT fk_b_a FOREIGN KEY (b_a) REFERENCES t1 (a_id) ON DELETE CASCADE ON UPDATE NO ACTION) ENGINE=InnoDB DEFAULT CHARSET=latin1;
+INSERT INTO t2 VALUES (1,1),(2,1),(3,1),(4,2),(5,2);
+SELECT * FROM (SELECT t1.*,GROUP_CONCAT(t2.b_id SEPARATOR ',') as b_list FROM (t1 LEFT JOIN (t2) on t1.a_id = t2.b_a) GROUP BY t1.a_id ) AS xyz;
+a_id	b_list
+1	1,2,3
+2	4,5
+3	NULL
+DROP TABLE t2;
+DROP TABLE t1;
+CREATE TABLE t1 (A_ID INT NOT NULL,A_DESC CHAR(3) NOT NULL,PRIMARY KEY (A_ID));
+INSERT INTO t1 VALUES (1,'ABC'), (2,'EFG'), (3,'HIJ');
+CREATE TABLE t2 (A_ID INT NOT NULL,B_DESC CHAR(3) NOT NULL,PRIMARY KEY (A_ID,B_DESC));
+INSERT INTO t2 VALUES (1,'A'),(1,'B'),(3,'F');
+SELECT t1.A_ID, GROUP_CONCAT(t2.B_DESC) AS B_DESC FROM t1 LEFT JOIN t2 ON t1.A_ID=t2.A_ID GROUP BY t1.A_ID ORDER BY t1.A_DESC;
+A_ID	B_DESC
+1	A,B
+2	NULL
+3	F
+DROP TABLE t1;
+DROP TABLE t2;

mysql-test/t/func_gconcat.test

@@ -201,3 +201,38 @@ SELECT GROUP_CONCAT(a SEPARATOR '||') AS names FROM t1
 SELECT GROUP_CONCAT(a SEPARATOR '###') AS names FROM t1 
   HAVING LEFT(names, 1) ='J';
 DROP TABLE t1;
+
+#
+# check blobs
+#
+
+CREATE TABLE t1 ( a int, b TEXT );
+INSERT INTO t1 VALUES (1,'First Row'), (2,'Second Row');
+SELECT GROUP_CONCAT(b ORDER BY b) FROM t1 GROUP BY a;
+DROP TABLE t1;
+
+#
+# check null values #1
+#
+
+CREATE TABLE t1 (a_id tinyint(4) NOT NULL default '0', PRIMARY KEY  (a_id)) ENGINE=InnoDB DEFAULT CHARSET=latin1;
+INSERT INTO t1 VALUES (1),(2),(3);
+CREATE TABLE t2 (b_id tinyint(4) NOT NULL default '0',b_a tinyint(4) NOT NULL default '0', PRIMARY KEY  (b_id), KEY  (b_a), 
+                CONSTRAINT fk_b_a FOREIGN KEY (b_a) REFERENCES t1 (a_id) ON DELETE CASCADE ON UPDATE NO ACTION) ENGINE=InnoDB DEFAULT CHARSET=latin1;
+INSERT INTO t2 VALUES (1,1),(2,1),(3,1),(4,2),(5,2);
+SELECT * FROM (SELECT t1.*,GROUP_CONCAT(t2.b_id SEPARATOR ',') as b_list FROM (t1 LEFT JOIN (t2) on t1.a_id = t2.b_a) GROUP BY t1.a_id ) AS xyz;
+DROP TABLE t2;
+DROP TABLE t1;
+
+#
+# check null values #2
+#
+
+CREATE TABLE t1 (A_ID INT NOT NULL,A_DESC CHAR(3) NOT NULL,PRIMARY KEY (A_ID));
+INSERT INTO t1 VALUES (1,'ABC'), (2,'EFG'), (3,'HIJ');
+CREATE TABLE t2 (A_ID INT NOT NULL,B_DESC CHAR(3) NOT NULL,PRIMARY KEY (A_ID,B_DESC));
+INSERT INTO t2 VALUES (1,'A'),(1,'B'),(3,'F');
+SELECT t1.A_ID, GROUP_CONCAT(t2.B_DESC) AS B_DESC FROM t1 LEFT JOIN t2 ON t1.A_ID=t2.A_ID GROUP BY t1.A_ID ORDER BY t1.A_DESC;
+DROP TABLE t1;
+DROP TABLE t2;
+

sql/item_sum.cc

@@ -1966,14 +1966,13 @@ Item_func_group_concat::fix_fields(THD *thd, TABLE_LIST *tables, Item **ref)
     Fix fields for select list and ORDER clause
   */
 
-  for (i= 0 ; i < arg_count ; i++)
+  for (uint i=0 ; i < arg_count ; i++)  
   {
     if (args[i]->fix_fields(thd, tables, args + i) || args[i]->check_cols(1))
       return 1;
-    if (i < arg_count_field && args[i]->maybe_null)
-      maybe_null= 0;
+    maybe_null |= args[i]->maybe_null;
   }
-
+  
   result_field= 0;
   null_value= 1;
   max_length= group_concat_max_len;
@@ -1993,6 +1992,8 @@ bool Item_func_group_concat::setup(THD *thd)
   uint const_fields;
   byte *record;
   qsort_cmp2 compare_key;
+  Copy_field *ptr;  
+  Copy_field *end;
   DBUG_ENTER("Item_func_group_concat::setup");
 
   if (select_lex->linkage == GLOBAL_OPTIONS_TYPE)
@@ -2054,6 +2055,16 @@ bool Item_func_group_concat::setup(THD *thd)
   key_length= table->reclength;
   record= table->record[0];
 
+  /*
+    We need to store value of blob in buffer of a record instead of a pointer of 
+	one. 
+  */
+  ptr=tmp_table_param->copy_field; 
+  end=tmp_table_param->copy_field_end;
+
+  for (; ptr != end; ptr++)
+    ptr->set(ptr->to_field,ptr->from_field,1);
+
   /* Offset to first result field in table */
   field_list_offset= table->fields - (list.elements - const_fields);