Manual merge from mysql-trunk-merge.

Conflicts:
  - sql/sql_select.cc

mysql-test/r/fulltext.result

@@ -611,4 +611,12 @@ WHERE t3.a=t1.a AND MATCH(b2) AGAINST('scargill' IN BOOLEAN MODE)
 count(*)
 0
 DROP TABLE t1,t2,t3;
+#
+# Bug #49445: Assertion failed: 0, file .\item_row.cc, line 55 with 
+#   fulltext search and row op
+#
+CREATE TABLE t1(a CHAR(1),FULLTEXT(a));
+SELECT 1 FROM t1 WHERE MATCH(a) AGAINST ('') AND ROW(a,a) > ROW(1,1);
+1
+DROP TABLE t1;
 End of 5.1 tests

mysql-test/t/fulltext.test

@@ -554,4 +554,14 @@ SELECT count(*) FROM t1 WHERE
 DROP TABLE t1,t2,t3;
 
 
+--echo #
+--echo # Bug #49445: Assertion failed: 0, file .\item_row.cc, line 55 with 
+--echo #   fulltext search and row op
+--echo #
+
+CREATE TABLE t1(a CHAR(1),FULLTEXT(a));
+SELECT 1 FROM t1 WHERE MATCH(a) AGAINST ('') AND ROW(a,a) > ROW(1,1);
+DROP TABLE t1;
+
+
 --echo End of 5.1 tests

sql/sql_select.cc

@@ -3673,20 +3673,20 @@ add_ft_keys(DYNAMIC_ARRAY *keyuse_array,
       cond_func=(Item_func_match *)cond;
     else if (func->arg_count == 2)
     {
-      Item_func *arg0=(Item_func *)(func->arguments()[0]),
-                *arg1=(Item_func *)(func->arguments()[1]);
-      if (arg1->const_item()  &&
+      Item *arg0=(Item *)(func->arguments()[0]),
+           *arg1=(Item *)(func->arguments()[1]);
+      if (arg1->const_item() && arg1->cols() == 1 &&
            arg0->type() == Item::FUNC_ITEM &&
-           arg0->functype() == Item_func::FT_FUNC     &&
+           ((Item_func *) arg0)->functype() == Item_func::FT_FUNC &&
           ((functype == Item_func::GE_FUNC && arg1->val_real() > 0) ||
            (functype == Item_func::GT_FUNC && arg1->val_real() >=0)))
-        cond_func=(Item_func_match *) arg0;
+        cond_func= (Item_func_match *) arg0;
       else if (arg0->const_item() &&
                 arg1->type() == Item::FUNC_ITEM &&
-                arg1->functype() == Item_func::FT_FUNC   &&
+                ((Item_func *) arg1)->functype() == Item_func::FT_FUNC &&
                ((functype == Item_func::LE_FUNC && arg0->val_real() > 0) ||
                 (functype == Item_func::LT_FUNC && arg0->val_real() >=0)))
-        cond_func=(Item_func_match *) arg1;
+        cond_func= (Item_func_match *) arg1;
     }
   }
   else if (cond->type() == Item::COND_ITEM)