MDEV-22716: Assertion `0' failed in Type_handler_row::subquery_type_allows_materialization

For ROW data type, materialization is not possible, so IN predicate to IN subquery conversion
should not be allowed in this case.

mysql-test/main/subselect4.result

@@ -2751,4 +2751,19 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 set names default;
 set @@in_predicate_conversion_threshold= @save_in_predicate_conversion_threshold;
 DROP TABLE t1,t2;
+#
+# MDEV-22716: Assertion `0' failed in Type_handler_row::subquery_type_allows_materialization
+#
+CREATE TABLE t1(a INT,b INT);
+INSERT INTO t1 VALUES (1,1), (2,2);
+set @save_in_predicate_conversion_threshold= @@in_predicate_conversion_threshold;
+SET SESSION in_predicate_conversion_threshold=2;
+EXPLAIN SELECT 1 FROM t1 WHERE ROW(a,(a,a)) IN ((1,(1,1)),(2,(2,1)));
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	2	Using where
+SELECT 1 FROM t1 WHERE ROW(a,(a,a)) IN ((1,(1,1)),(2,(2,1)));
+1
+1
+set @@in_predicate_conversion_threshold= @save_in_predicate_conversion_threshold;
+DROP TABLE t1;
 # End of 10.3 tests

mysql-test/main/subselect4.test

@@ -2274,4 +2274,18 @@ set names default;
 set @@in_predicate_conversion_threshold= @save_in_predicate_conversion_threshold;
 DROP TABLE t1,t2;
 
+--echo #
+--echo # MDEV-22716: Assertion `0' failed in Type_handler_row::subquery_type_allows_materialization
+--echo #
+
+CREATE TABLE t1(a INT,b INT);
+INSERT INTO t1 VALUES (1,1), (2,2);
+
+set @save_in_predicate_conversion_threshold= @@in_predicate_conversion_threshold;
+SET SESSION in_predicate_conversion_threshold=2;
+EXPLAIN SELECT 1 FROM t1 WHERE ROW(a,(a,a)) IN ((1,(1,1)),(2,(2,1)));
+SELECT 1 FROM t1 WHERE ROW(a,(a,a)) IN ((1,(1,1)),(2,(2,1)));
+set @@in_predicate_conversion_threshold= @save_in_predicate_conversion_threshold;
+
+DROP TABLE t1;
 --echo # End of 10.3 tests

sql/sql_type.h

@@ -1485,7 +1485,6 @@ class Type_handler_row: public Type_handler
                                             const Item *outer,
                                             bool is_in_predicate) const
   {
-    DBUG_ASSERT(0);
     return false;
   }
   Field *make_num_distinct_aggregator_field(MEM_ROOT *, const Item *) const