check that row elements have the same dimention that SELECT list elements in...

check that row elements have the same dimention that SELECT list elements in comporison between rows and subqueries added (BUG#8022)

mysql-test/r/subselect.result

@@ -2174,3 +2174,11 @@ select  row(1,2) != ALL (select * from t1);
 row(1,2) != ALL (select * from t1)
 1
 drop table t1;
+create table t1 (a integer, b integer);
+select row(1,(2,2)) in (select * from t1 );
+ERROR 21000: Operand should contain 2 column(s)
+select row(1,(2,2)) = (select * from t1 );
+ERROR 21000: Operand should contain 2 column(s)
+select (select * from t1) = row(1,(2,2));
+ERROR 21000: Operand should contain 1 column(s)
+drop table t1;

mysql-test/t/subselect.test

@@ -1437,3 +1437,15 @@ select (select 1,2) = (select * from t1);
 select  row(1,2) = ANY (select * from t1);
 select  row(1,2) != ALL (select * from t1);
 drop table t1;
+
+#
+# Comparison subquery and row with nested rows
+#
+create table t1 (a integer, b integer);
+-- error 1241
+select row(1,(2,2)) in (select * from t1 );
+-- error 1241
+select row(1,(2,2)) = (select * from t1 );
+-- error 1241
+select (select * from t1) = row(1,(2,2));
+drop table t1;

sql/item_subselect.cc

@@ -995,6 +995,10 @@ Item_in_subselect::row_value_transformer(JOIN *join)
     List_iterator_fast<Item> li(select_lex->item_list);
     for (uint i= 0; i < n; i++)
     {
+      DBUG_ASSERT(left_expr->fixed && select_lex->ref_pointer_array[i]->fixed);
+      if (select_lex->ref_pointer_array[i]->
+          check_cols(left_expr->el(i)->cols()))
+        goto err;
       Item *func= new Item_ref_null_helper(this,
 					   select_lex->ref_pointer_array+i,
 					   (char *) "<no matter>",