Post-merge fix.

mysql-test/r/row.result

@@ -193,6 +193,12 @@ SELECT ROW(2,1) IN (ROW(21,2),ROW(ROW(1,1,3),0));
 ERROR 21000: Operand should contain 1 column(s)
 SELECT ROW(2,1) IN (ROW(ROW(1,1,3),0),ROW(21,2));
 ERROR 21000: Operand should contain 1 column(s)
+SELECT ROW(1,1,1) = ROW(1,1,1) as `1`, ROW(1,1,1) = ROW(1,2,1) as `0`, ROW(1,NULL,1) = ROW(2,2,1) as `0`, ROW(1,NULL,1) = ROW(1,2,2) as `0`, ROW(1,NULL,1) = ROW(1,2,1) as `null` ;
+1	0	0	0	null
+1	0	0	0	NULL
+select row(NULL,1)=(2,0);
+row(NULL,1)=(2,0)
+0
 CREATE TABLE t1 (a int, b int, PRIMARY KEY (a,b));
 INSERT INTO t1 VALUES (1,1), (2,1), (3,1), (1,2), (3,2), (3,3);
 EXPLAIN SELECT * FROM t1 WHERE a=3 AND b=2;

sql/item_cmpfunc.cc

@@ -95,9 +95,9 @@ static int cmp_row_type(Item* item1, Item* item2)
     return 1;
   for (uint i=0; i<n; i++)
   {
-    if (item2->el(i)->check_cols(item1->el(i)->cols()) ||
-        (item1->el(i)->result_type() == ROW_RESULT &&
-         cmp_row_type(item1->el(i), item2->el(i))))
+    if (item2->element_index(i)->check_cols(item1->element_index(i)->cols()) ||
+        (item1->element_index(i)->result_type() == ROW_RESULT &&
+         cmp_row_type(item1->element_index(i), item2->element_index(i))))
       return 1;
   }
   return 0;