Merge

mysql-test/r/cast.result

@@ -367,3 +367,6 @@ DROP TABLE t1;
 select cast(NULL as decimal(6)) as t1;
 t1
 NULL
+select cast(1.0e+300 as signed int);
+cast(1.0e+300 as signed int)
+9223372036854775807

mysql-test/t/cast.test

@@ -160,6 +160,11 @@ select cast(concat('184467440','73709551615') as signed);
 select cast(repeat('1',20) as unsigned);
 select cast(repeat('1',20) as signed);
 
+#
+# Bug #13344: cast of large decimal to signed int not handled correctly
+#
+select cast(1.0e+300 as signed int);
+
 # End of 4.1 tests
 
 

sql/item.h

@@ -1331,6 +1331,14 @@ class Item_float :public Item_num
   longlong val_int()
   {
     DBUG_ASSERT(fixed == 1);
+    if (value <= (double) LONGLONG_MIN)
+    {
+       return LONGLONG_MIN;
+    }
+    else if (value >= (double) (ulonglong) LONGLONG_MAX)
+    {
+      return LONGLONG_MAX;
+    }
     return (longlong) (value+(value > 0 ? 0.5 : -0.5));
   }
   String *val_str(String*);