Merge epotemkin@bk-internal.mysql.com:/home/bk/mysql-5.0

into sunlight.local:/work_local/14169-bug-5.0-mysql

sql/item_sum.h

@@ -1116,6 +1116,13 @@ public:
   enum Sumfunctype sum_func () const {return GROUP_CONCAT_FUNC;}
   const char *func_name() const { return "group_concat"; }
   virtual Item_result result_type () const { return STRING_RESULT; }
+  enum_field_types field_type() const
+  {
+    if (max_length/collation.collation->mbmaxlen > CONVERT_IF_BIGGER_TO_BLOB)
+      return FIELD_TYPE_BLOB;
+    else
+      return MYSQL_TYPE_VARCHAR;
+  }
   void clear();
   bool add();
   void reset_field() { DBUG_ASSERT(0); }        // not used

tests/mysql_client_test.c

@@ -14841,6 +14841,40 @@ static void test_bug15613()
 }
 
 /*
+  Bug#14169: type of group_concat() result changed to blob if tmp_table was used
+*/
+static void test_bug14169()
+{
+  MYSQL_STMT *stmt;
+  const char *stmt_text;
+  MYSQL_RES *res;
+  MYSQL_FIELD *field;
+  int rc;
+
+  myheader("test_bug14169");
+
+  rc= mysql_query(mysql, "drop table if exists t1");
+  myquery(rc);
+  rc= mysql_query(mysql, "set session group_concat_max_len=1024");
+  myquery(rc);
+  rc= mysql_query(mysql, "create table t1 (f1 int unsigned, f2 varchar(255))");
+  myquery(rc);
+  rc= mysql_query(mysql, "insert into t1 values (1,repeat('a',255)),"
+                         "(2,repeat('b',255))");
+  myquery(rc);
+  stmt= mysql_stmt_init(mysql);
+  stmt_text= "select f2,group_concat(f1) from t1 group by f2";
+  rc= mysql_stmt_prepare(stmt, stmt_text, strlen(stmt_text));
+  myquery(rc);
+  res= mysql_stmt_result_metadata(stmt);
+  field= mysql_fetch_fields(res);
+  if (!opt_silent)
+    printf("GROUP_CONCAT() result type %i", field[1].type);
+  DIE_UNLESS(field[1].type == MYSQL_TYPE_BLOB);
+
+  rc= mysql_query(mysql, "drop table t1");
+  myquery(rc);
+}/*
   Read and parse arguments and MySQL options from my.cnf
 */
 
@@ -15105,6 +15139,7 @@ static struct my_tests_st my_tests[]= {
   { "test_bug16143", test_bug16143 },
   { "test_bug16144", test_bug16144 },
   { "test_bug15613", test_bug15613 },
+  { "test_bug14169", test_bug14169 },
   { 0, 0 }
 };