MDEV-29653 Make sure Item_cache_row has the correct type handler.

The incorrect type handler caused an incorrect result_type() for
Item_cache_row (STRING_RESULT rather than ROW_RESULT). By updating the
constructor of Item_cache_row with the correct type handler, it fixes
this problem.

Signed-off-by: Yuchen Pei <yuchen.pei@mariadb.com>
Reviewed-by: Sergei Golubchik <serg@mariadb.com>

sql/item.h

@@ -7305,7 +7305,7 @@ class Item_cache_row: public Item_cache
   bool save_array;
 public:
   Item_cache_row(THD *thd):
-    Item_cache(thd), values(0), item_count(2),
+    Item_cache(thd, &type_handler_row), values(0), item_count(2),
     save_array(0) {}
 
   /*

storage/spider/mysql-test/spider/bugfix/r/mdev_29653.result

@@ -0,0 +1,33 @@
+#
+# MDEV-29653 Assertion `0' failed in Item_cache_row::illegal_method_call on SELECT from Spider table
+#
+for master_1
+for child2
+child2_1
+child2_2
+child2_3
+for child3
+connection child2_1;
+CREATE DATABASE auto_test_remote;
+USE auto_test_remote;
+CREATE TABLE t (
+c INT
+) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+connection master_1;
+CREATE DATABASE auto_test_local;
+USE auto_test_local;
+CREATE TABLE ts (
+c INT
+) ENGINE=Spider COMMENT='table "t", srv "s_2_1"';
+SELECT 1 FROM ts WHERE ROW(c, c) NOT IN ((0,0),(1,1));
+1
+connection master_1;
+DROP DATABASE IF EXISTS auto_test_local;
+connection child2_1;
+DROP DATABASE IF EXISTS auto_test_remote;
+for master_1
+for child2
+child2_1
+child2_2
+child2_3
+for child3

storage/spider/mysql-test/spider/bugfix/t/mdev_29653.cnf

@@ -0,0 +1,3 @@
+!include include/default_mysqld.cnf
+!include ../my_1_1.cnf
+!include ../my_2_1.cnf

storage/spider/mysql-test/spider/bugfix/t/mdev_29653.test

@@ -0,0 +1,37 @@
+--echo #
+--echo # MDEV-29653 Assertion `0' failed in Item_cache_row::illegal_method_call on SELECT from Spider table
+--echo #
+
+--disable_query_log
+--disable_result_log
+--source ../../t/test_init.inc
+--enable_result_log
+--enable_query_log
+
+--connection child2_1
+CREATE DATABASE auto_test_remote;
+USE auto_test_remote;
+eval CREATE TABLE t (
+    c INT
+) $CHILD2_1_ENGINE $CHILD2_1_CHARSET;
+
+--connection master_1
+CREATE DATABASE auto_test_local;
+USE auto_test_local;
+eval CREATE TABLE ts (
+    c INT
+) $MASTER_1_ENGINE COMMENT='table "t", srv "s_2_1"';
+
+SELECT 1 FROM ts WHERE ROW(c, c) NOT IN ((0,0),(1,1));
+
+--connection master_1
+DROP DATABASE IF EXISTS auto_test_local;
+
+--connection child2_1
+DROP DATABASE IF EXISTS auto_test_remote;
+
+--disable_query_log
+--disable_result_log
+--source ../t/test_deinit.inc
+--enable_query_log
+--enable_result_log